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Journal articles on the topic 'Photometric method'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Subinay, Datta, Sarkar Biswajit, Ghosh Srabani, et al. "Validation of Automated ESR Method by Capillary Photometry with Conventional Westergren Method." International Journal of Pharmaceutical and Clinical Research 16, no. 2 (2024): 98–103. https://doi.org/10.5281/zenodo.11061894.

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<strong>Background:</strong> Westergren method is routinely used for ESR measurement. However, it has various limiting factors. Alternative method has to be devised to overcome the limitations of the manual Westergren method. These new methods must be properly evaluated before introducing in clinical laboratories. <strong>Methods:</strong> A total of 708 randomly collected Ethylene Diamine Tetraacetic Acid (EDTA) samples from patients attending in hospital were assayed parallelly in the recently launched Hematology Analyzer Roller 20 LC and manual Westergren method. Results of t

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Fotopoulou, S., and S. Paltani. "CPz: Classification-aided photometric-redshift estimation." Astronomy & Astrophysics 619 (October 30, 2018): A14. http://dx.doi.org/10.1051/0004-6361/201730763.

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Broadband photometry offers a time and cost effective method to reconstruct the continuum emission of celestial objects. Thus, photometric redshift estimation has supported the scientific exploitation of extragalactic multiwavelength surveys for more than twenty years. Deep fields have been the backbone of galaxy evolution studies and have brought forward a collection of various approaches in determining photometric redshifts. In the era of precision cosmology, with the upcoming Euclid and LSST surveys, very tight constraints are put on the expected performance of photometric redshift estimati

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Xiao, Kai, Haibo Yuan, C. López-Sanjuan, et al. "J-PLUS: Photometric Recalibration with the Stellar Color Regression Method and an Improved Gaia XP Synthetic Photometry Method." Astrophysical Journal Supplement Series 269, no. 2 (2023): 58. http://dx.doi.org/10.3847/1538-4365/ad0645.

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Abstract We employ the corrected Gaia Early Data Release 3 photometric data and spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR7 to assemble a sample of approximately 0.25 million FGK dwarf photometric standard stars for the 12 J-PLUS filters using the stellar color regression (SCR) method. We then independently validate the J-PLUS DR3 photometry and uncover significant systematic errors: up to 15 mmag in the results from the stellar locus method and up to 10 mmag primarily caused by magnitude-, color-, and extinction-dependent errors of the Ga

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Xiao, Kai, Yang Huang, Haibo Yuan, et al. "S-PLUS: Photometric Recalibration with the Stellar Color Regression Method and an Improved Gaia XP Synthetic Photometry Method." Astrophysical Journal Supplement Series 271, no. 2 (2024): 41. http://dx.doi.org/10.3847/1538-4365/ad24fa.

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Abstract We present a comprehensive recalibration of narrowband/medium-band and broadband photometry from the Southern Photometric Local Universe Survey (S-PLUS) by leveraging two approaches: an improved Gaia XP synthetic photometry (XPSP) method with corrected Gaia XP spectra, and the stellar color regression (SCR) method with corrected Gaia Early Data Release 3 photometric data and spectroscopic data from LAMOST Data Release 7. Through the use of millions of stars as standards per band, we demonstrate the existence of position-dependent systematic errors, up to 23 mmag for the main survey re

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Tatarnikov, A. M., та A. A. Tatarnikov. "Сolor transformation between photometric systems of 2MASS catalog and ASTRONIRCAM of SAI MSU 2.5-m telescope". Seriya 3: Fizika, Astronomiya, № 2_2023 (2 червня 2023): 2320801–1. http://dx.doi.org/10.55959/msu0579-9392.78.2320801.

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In this paper, we consider a method for determining the coefficients of the transformation equations between different photometric systems based on the photometry of all field stars recorded during observations of the primary standards of one of the photometric systems. Using this method, the coefficients of color transformation equations between the photometric system of ASTRONIRCAM of the 2.5-m telescope KGO SAI MSU and the 2MASS all-sky survey catalog photometric system are obtained.

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Li, Xiao Pan, Cheng Yang, Li Zhou, and Hai Tao Yang. "Photometric Data Procession of the Swift/UVOT Instrument." Advanced Materials Research 989-994 (July 2014): 3489–92. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3489.

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The Ultraviolet/Optical Telescope (UVOT) which is one of three scientific instruments onboard the NASA-led Swift satellite provides simultaneous ultraviolet and optical photometric data. We present the installing procedures of HEASoft software and the detailed method for using the HEASoft in UVOT photometric data processions. We focus on the application of photometry processes, and present the photometry of Quasar PKS 0537-441. The analysis of the photometric data shows that this source has extreme variations in optical and ultraviolet bands and the shape of photometric flux curves in each ban

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Li, Shijie, Weijun Lin, Qingyuan Xiang, Yunbin Tu, Shitan Asu, and Zheng Li. "Unsupervised Photometric-Consistent Depth Estimation from Endoscopic Monocular Video." Proceedings of the AAAI Conference on Artificial Intelligence 39, no. 5 (2025): 4923–31. https://doi.org/10.1609/aaai.v39i5.32521.

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Recent advancements in unsupervised monocular depth estimation typically rely on an assumption that image photometry remains consistent across consecutive frames. However, this assumption often fails in endoscopic scenes due to: 1) local photometric inconsistency caused by specular reflections creating highlights; and 2) global photometric inconsistency resulting from the simultaneous movement of the light source and the camera. Since unsupervised depth estimation methods rely on appearance discrepancies between frames as a supervisory signal, these photometric inconsistencies inevitably deter

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Whitten, D. D., V. M. Placco, T. C. Beers, et al. "J-PLUS: Identification of low-metallicity stars with artificial neural networks using SPHINX." Astronomy & Astrophysics 622 (February 2019): A182. http://dx.doi.org/10.1051/0004-6361/201833368.

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Context. We present a new methodology for the estimation of stellar atmospheric parameters from narrow- and intermediate-band photometry of the Javalambre Photometric Local Universe Survey (J-PLUS), and propose a method for target pre-selection of low-metallicity stars for follow-up spectroscopic studies. Photometric metallicity estimates for stars in the globular cluster M15 are determined using this method. Aims. By development of a neural-network-based photometry pipeline, we aim to produce estimates of effective temperature, Teff, and metallicity, [Fe/H], for a large subset of stars in the

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Markov, H. "Peculiarities of the Internal Photometrical Calibration Method Using Density Stellar Profiles." Symposium - International Astronomical Union 161 (1994): 309–10. http://dx.doi.org/10.1017/s0074180900047549.

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On photographic plates taken for the purposes of classical stellar photometry (using a standard stellar sequence) there usually is no external photometrical calibration scale, neither a wedge nor spots; and hence the transition to relative intensity is a problem. The construction of a characteristic curve D(I) (hereafter CHC) by combining density profiles of several standard stars is a perfect solution of this task (Agnelli et al. 1979; de Vaucouleurs 1984). We have developed this method in order to obtain internal photometric calibrations for a large number of plates taken at the RC focus of

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ČAVLOVIĆ, ANKA OZANA, and IVAN BEŠLIĆ. "APPLICATION OF PHOTOMETRY IN DETERMINING THE DUST MASS CONCENTRATION OF HARDWOODS." WOOD RESEARCH 66(4) 2021 66, no. 4 (2021): 678–88. http://dx.doi.org/10.37763/wr.1336-4561/66.4.678688.

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Given the carcinogenicity of hardwood dust, the aim of this study was to determine the effectiveness of the photometric method for different types of woodworking machines and its application in determining the mass concentration of inhalable dust for raw and dry hardwoods. In addition to the optical part of the device, the input part of the measuring device contains the Institute of Occupational Medicine (IOM) inhalable dust filter holder. This correlation of gravimetric and photometric methods in determining the dust mass concentration showed that photometry underestimates the mass concentrat

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Bódi, Attila, Pál Szabó, Emese Plachy, László Molnár, and Róbert Szabó. "Automated Extended Aperture Photometry of K2 Variable Stars." Publications of the Astronomical Society of the Pacific 134, no. 1031 (2022): 014503. http://dx.doi.org/10.1088/1538-3873/ac4398.

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Abstract Proper photometric data are challenging to obtain in the K2 mission of the Kepler space telescope due to strong systematics caused by the two-wheel-mode operation. It is especially true for variable stars wherein physical phenomena occur on timescales similar to the instrumental signals. We originally developed a method with the aim to extend the photometric aperture to be able to compensate the motion of the telescope which we named Extended Aperture Photometry (EAP). Here we present the outline of the automatized version of the EAP method, an open-source pipeline called autoEAP. We

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De Ridder, Joris, Conny Aerts, and Marc-Antoine Dupret. "Mode Identification Using Photometry and Spectroscopy." International Astronomical Union Colloquium 193 (2004): 466–69. http://dx.doi.org/10.1017/s0252921100011155.

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AbstractWe tested a stepwise approach to combine photometry and spectroscopy for mode identification where we first used the photometric amplitude ratios to restrict the degree l, then did a spectroscopic mode identification, and finally fitted the photometric amplitudes to restrict the list of candidate modes. For the spectroscopic mode identification, we implemented an efficient multi-mode moment method variant. We conclude that this new variant works well, but that the photometric amplitudes are too model sensitive to do any additional mode discrimination.

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Stahl, Benjamin E., Thomas de Jaeger, WeiKang Zheng, and Alexei V. Filippenko. "The snapshot distance method: estimating the distance to a Type Ia supernova from minimal observations." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 2300–2308. http://dx.doi.org/10.1093/mnras/stab1367.

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ABSTRACT We present the snapshot distance method (SDM), a modern incarnation of a proposed technique for estimating the distance to a Type Ia supernova (SN Ia) from minimal observations. Our method, which has become possible owing to recent work in the application of deep learning to SN Ia spectra (we use the deepSIP package), allows us to estimate the distance to an SN Ia from a single optical spectrum and epoch of 2 + passband photometry – one night’s worth of observations (though contemporaneity is not a requirement). Using a compilation of well-observed SNe Ia, we generate snapshot distanc

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Toptun, Victoria A., Igor V. Chilingarian, Kirill A. Grishin, and Ivan Yu Katkov. "Color Transformations of Photometric Measurements of Galaxies in Optical and Near-infrared Wide-field Imaging Surveys*." Publications of the Astronomical Society of the Pacific 135, no. 1050 (2023): 084102. http://dx.doi.org/10.1088/1538-3873/aceca0.

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Abstract Over the past 2 decades, wide-field photometric surveys in optical and infrared domains reached a nearly all-sky coverage thanks to numerous observational facilities operating in both hemispheres. However, subtle differences among exact realizations of Johnson and SDSS photometric systems require one to convert photometric measurements into the same system prior to analysis of composite data sets originating from multiple surveys. It turns out that the published photometric transformations lead to substantial biases when applied to integrated photometry of galaxies from the correspond

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Gorobets, Leonid V., Andrey V. Sapogovskiy, Evgenii V. Melchenko, Aleksandr N. Kasev, and Vladimir M. Kenis. "A Photometric Method for Measuring Ankle Dorsiflexion Reproducibility in Young Athletes." Pediatric Traumatology, Orthopaedics and Reconstructive Surgery 13, no. 2 (2025): 154–60. https://doi.org/10.17816/ptors680803.

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BACKGROUND: Ankle dorsiflexion is one of the most important biomechanical indicators of the potential functional capacity of the foot. Its quantitative assessment is crucial in clinical evaluation, and in determining children’s readiness for sports and their potential risk of sports-related injuries. AIM: This study aimed to evaluate the reproducibility of a photometric method for measuring ankle dorsiflexion angles in young athletes in relation to the conventional goniometric method. METHODS: This study included 30 children aged 6–12 years who participated in regular sports activities and had

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Xiao, Kai, and Haibo Yuan. "Validation and Improvement of the Pan-STARRS Photometric Calibration with the Stellar Color Regression Method." Astronomical Journal 163, no. 4 (2022): 185. http://dx.doi.org/10.3847/1538-3881/ac540a.

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Abstract As one of the best ground-based photometric data set, Pan-STARRS1 (PS1) has been widely used as the reference to calibrate other surveys. In this work, we present an independent validation and recalibration of the PS1 photometry using spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR7, and photometric data from the corrected Gaia Early Data Release 3 (EDR3) with the Stellar Color Regression (SCR) method. Using per band typically a total of 1.5 million LAMOST-PS1-Gaia stars as standards, we show that the PS1 photometric calibration precis

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Batista, Elsa, Isabel Godinho, George Rodrigues, and Doreen Rumery. "Validation of the Photometric Method Used for Micropipette Calibration." NCSL International measure 13, no. 1 (2021): 40–45. http://dx.doi.org/10.51843/measure.13.1.4.

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There are two methods generally used for calibration of micropipettes: the gravimetric method described in ISO 8655-6:2002 and the photometric method described in ISO 8655-7:2005. In order to validate the photometric method, several micropipettes of different capacities from 0.1 µL to 1000 µL were calibrated using both methods (gravimetric and photometric) in two different laboratories, IPQ (Portuguese Institute for Quality) and Artel. These tests were performed by six different operators. The uncertainty for both methods was determined and it was verified that the uncertainty component that h

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Lee, Bomee, and Ranga-Ram Chary. "Improved photometric redshifts with colour-constrained galaxy templates for future wide-area surveys." Monthly Notices of the Royal Astronomical Society 497, no. 2 (2020): 1935–45. http://dx.doi.org/10.1093/mnras/staa2100.

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ABSTRACT Cosmology and galaxy evolution studies with LSST, Euclid, and Roman, will require accurate redshifts for the detected galaxies. In this study, we present improved photometric redshift estimates for galaxies using a template library that populates three-colour space and is constrained by HST/CANDELS photometry. For the training sample, we use a sample of galaxies having photometric redshifts that allows us to train on a large, unbiased galaxy sample having deep, unconfused photometry at optical-to-mid infrared wavelengths. Galaxies in the training sample are assigned to cubes in 3D col

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Desprez, G., S. Paltani, J. Coupon, et al. "Euclid preparation." Astronomy & Astrophysics 644 (November 25, 2020): A31. http://dx.doi.org/10.1051/0004-6361/202039403.

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Forthcoming large photometric surveys for cosmology require precise and accurate photometric redshift (photo-z) measurements for the success of their main science objectives. However, to date, no method has been able to produce photo-zs at the required accuracy using only the broad-band photometry that those surveys will provide. An assessment of the strengths and weaknesses of current methods is a crucial step in the eventual development of an approach to meet this challenge. We report on the performance of 13 photometric redshift code single value redshift estimates and redshift probability

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H. Puzia, Thomas, Markus Kissler-Patig, Jean Brodie, et al. "Extragalactic Globular Cluster Systems in the Near-IR." Symposium - International Astronomical Union 207 (2002): 294–300. http://dx.doi.org/10.1017/s0074180900223887.

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Extragalactic Globular Clusters are useful tracers of galaxy formation and evolution. Photometric studies of globular cluster systems beyond the Local Group are still the most popular method to investigate their physical properties, such as their ages and metallicities. However, the limitations of optical photometry are well known. The better wavelength sampling of the underlying cluster's SED using K-band photometry combined with optical passbands allows us to create colors which reduce the age-metallicity degeneracy to the largest extent. Here we report on the very first results of our near-

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Gu, Feifei, Hong Zhao, Xiang Zhou, Jinjun Li, Penghui Bu, and Zixin Zhao. "Photometric invariant stereo matching method." Optics Express 23, no. 25 (2015): 31779. http://dx.doi.org/10.1364/oe.23.031779.

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Maskoliunas, M., J. Zdanavičius, V. Čepas, et al. "New calibration of the Vilnius photometric system." Proceedings of the International Astronomical Union 14, A30 (2018): 486. http://dx.doi.org/10.1017/s1743921319005179.

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AbstractThe medium-band Vilnius photometric system with the mean wavelengths at 345 (U), 374 (P), 405 (X), 466 (Y), 516 (Z), 544 (V), and 656 (S) nm for many years was an important tool to determine interstellar reddenings and distances of single stars due to its ability to classify stars of all temperatures in spectral classes and luminosity classes in the presence of different interstellar reddenings. At present, Gaia DR2 presents distances to stars with an unprecedented accuracy at least up to 3 kpc. However, multicolor photometry, which allows the classification of stars as well as the pre

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Miyazaki, Daisuke, and Kazuya Uegomori. "Example-Based Multispectral Photometric Stereo for Multi-Colored Surfaces." Journal of Imaging 8, no. 4 (2022): 107. http://dx.doi.org/10.3390/jimaging8040107.

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A photometric stereo needs three images taken under three different light directions lit one by one, while a color photometric stereo needs only one image taken under three different lights lit at the same time with different light directions and different colors. As a result, a color photometric stereo can obtain the surface normal of a dynamically moving object from a single image. However, the conventional color photometric stereo cannot estimate a multicolored object due to the colored illumination. This paper uses an example-based photometric stereo to solve the problem of the color photo

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Liu, Long, Yun Cui Zhang, and Jun Xiao. "The Influencing Factor Analyses of Narrow Beam LED Luminaire Performance Test." Advanced Materials Research 694-697 (May 2013): 3283–86. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.3283.

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The beam angle of the luminaire is an important factor to influence testing method. This paper mainly discusses the narrow beam luminaire test methods, especially luminaires space photometric, chromaticity characteristic test method. The factors step length and test time which influence spatial distribution photometer are analyzed. An example is introduced which show how to set electrical parameter, photometry parameter test efficiency for a narrow beam LED luminaire.

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Negi, S., J. Ebr, S. Karpov, and J. Eliášek. "Aerosol Measurement in B, V, and R Filters using Wide-field Photometry." Journal of Physics: Conference Series 2985, no. 1 (2025): 012011. https://doi.org/10.1088/1742-6596/2985/1/012011.

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Abstract The new method for aerosol measurement using wide-field stellar photometry was originally developed for B-filter data. The dependence of VAOD (vertical aerosol optical depth) on wavelength can be used to understand the physical characteristics of aerosol. The method has been extended for V and R filters using the Gaia stellar photometric catalog as the reference. We calculated the coefficients of the equation describing molecular and aerosol extinction of the atmosphere. For data in a particular filter, they depend on the telescope’s location. Light towards shorter wavelengths has hig

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Song, Euijeong, Seokjung Kim, Seok Chung, and Minho Chang. "SRPS–deep-learning-based photometric stereo using superresolution images." Journal of Computational Design and Engineering 8, no. 4 (2021): 995–1012. http://dx.doi.org/10.1093/jcde/qwab025.

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Abstract This paper introduces a novel deep-learning-based photometric stereo method that uses superresolution (SR) images: SR photometric stereo. Recent deep-learning-based SR algorithms have yielded great results in terms of enlarging images without mosaic effects. Supposing that the SR algorithms successfully enhance the feature and colour information of original images, implementing SR images using the photometric stereo method facilitates the use of considerably more information on the object than existing photometric stereo methods. We built a novel deep-learning-based network for the ph

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Huang, Xin, Xiao Bing Wang, and Guang De Tong. "Surface Reconstruction Method by Photometric Stereovision Based on Oren-Nayar’s Model." Applied Mechanics and Materials 239-240 (December 2012): 129–34. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.129.

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This article proposes a surface reconstruction method by photometric stereovision based on Oren-Nayar’s model. The classical photometric stereovision reconstructs the surface by the exploitation of Lambert’s model. However Lambert’s model does not take into account the complex geometric and radiometric phenomena such as masking, shadowing and inter-reflections between micro-facets on the surface. Thus this article will improve the photometric stereovision by using Oren-Nayar’s model instead of Lambert’s model. The photometric stereovision based on Oren-Nayar’s model will calculate respectively

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Huang, Bowen, and Haibo Yuan. "Photometric Recalibration of the SDSS Stripe 82 to a Few Millimagnitude Precision with the Stellar Color Regression Method and Gaia EDR3." Astrophysical Journal Supplement Series 259, no. 1 (2022): 26. http://dx.doi.org/10.3847/1538-4365/ac470d.

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Abstract By combining spectroscopic data from the LAMOST DR7, Sloan Digital Sky Survey (SDSS) DR12, and corrected photometric data from the Gaia EDR3, we apply the stellar color regression (SCR) method to recalibrate the SDSS Stripe 82 standard stars catalog of Ivezić et al. With a total number of about 30,000 spectroscopically targeted stars, we have mapped out the relatively large and strongly correlated photometric zero-point errors present in the catalog, ∼2.5% in the u band and ∼1% in the griz bands. Our study also confirms some small but significant magnitude dependence errors in the z b

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Bezuglyi, M. A., N. V. Bezuglaya, A. V. Ventsuryk, and K. P. Vonsevych. "Angular Photometry of Biological Tissue by Ellipsoidal Reflector Method." Devices and Methods of Measurements 10, no. 2 (2019): 160–68. http://dx.doi.org/10.21122/2220-9506-2019-10-2-160-168.

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Angular measurements in optics of biological tissues are used for different applied spectroscopic task for roughness surface control, define of refractive index and for research of optical properties. Purpose of the research is investigation of the reflectance of biologic tissues by the ellipsoidal reflector method under the variable angle of the incident radiation.The research investigates functional features of improved photometry method by ellipsoidal reflectors. The photometric setup with mirror ellipsoid of revolution in reflected light was developed. Theoretical foundations of the design

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Voskoboynikova, Olga, Aleksey Sukhanov, and Axel Duerkop. "Optical pH Sensing in Milk: A Small Puzzle of Indicator Concentrations and the Best Detection Method." Chemosensors 9, no. 7 (2021): 177. http://dx.doi.org/10.3390/chemosensors9070177.

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Optical chemical sensors can yield distinctively different responses that are dependent on the method applied for readout and evaluation. We therefore present a comprehensive study on the pH determined non-continuously with optical sensors in real milk samples by either photometry or colorimetry (via the RGB-readout of digital images) compared to the pH values obtained electrochemically by potentiometry. Additionally, the photometric determination of pH was conducted with single-wavelength and a dual wavelength ratiometric evaluation of the absorbance. It was found that both the precision and

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López-Sanjuan, C., J. Varela, D. Cristóbal-Hornillos, et al. "J-PLUS: photometric calibration of large-area multi-filter surveys with stellar and white dwarf loci." Astronomy & Astrophysics 631 (November 2019): A119. http://dx.doi.org/10.1051/0004-6361/201936405.

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Aims. We present the photometric calibration of the 12 optical passbands observed by the Javalambre Photometric Local Universe Survey (J-PLUS). Methods. The proposed calibration method has four steps: (i) definition of a high-quality set of calibration stars using Gaia information and available 3D dust maps; (ii) anchoring of the J-PLUS gri passbands to the Pan-STARRS photometric solution, accounting for the variation in the calibration with the position of the sources on the CCD; (iii) homogenization of the photometry in the other nine J-PLUS filters using the dust de-reddened instrumental st

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Maireles-González, Òscar, Joan Bartrina-Rapesta, Miguel Hernández-Cabronero, and Joan Serra-Sagristà. "Lossy Compression of Integer Astronomical Images Preserving Photometric Properties*." Publications of the Astronomical Society of the Pacific 136, no. 11 (2024): 114506. http://dx.doi.org/10.1088/1538-3873/ad8b69.

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Abstract Observatories are producing astronomical image data at quickly increasing rates. As a result, the efficiency of the compression methods employed is critical to meet the storage and distribution requirements of both observatories and scientists. This paper presents a novel lossy compression technique that is able to preserve the results of photometry analysis with high fidelity while improving upon the state of the art in terms of compression performance. The proposed compression pipeline combines a flexible bi-region quantization scheme with the lossless, dictionary-based, LPAQ9M enco

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Currle, Ulrike. "Determination of the Stability of Low Viscous Particle Inks." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (2012): 000035–46. http://dx.doi.org/10.4071/cicmt-2012-ta21.

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Inkjet printing is a flexible contactless deposition method for a variety of materials and applications in microelectronics. For a reliable printing process the stability of the ink is essential and verification of the stability of a suspension remains a demanding task. After presenting some fundamentals of ink preparation, several methods of determining the stability of inks considering different particles are discussed. In a stable suspension no sedimentation occurs i.e. the solid content remains constant over a long period. The simplest way of evaluating the stability is supposed to be visu

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Xiao, Kai, Haibo Yuan, Bowen Huang, Ruoyi Zhang, Lin Yang, and Shuai Xu. "Improvement of Pan-STARRS Photometric Calibration with LAMOST and Gaia." Astrophysical Journal Supplement Series 268, no. 2 (2023): 53. http://dx.doi.org/10.3847/1538-4365/acee73.

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Abstract In this work, we perform the recalibration of Pan-STARRS1 (PS1) photometry by correcting for position-dependent systematic errors using the spectroscopy-based stellar color regression (SCR) method, the photometry-based SCR method, and the Gaia BP/RP synthetic photometry method. We confirm the significant large-scale and small-scale spatial variation of the magnitude offsets for all the grizy filters. We show that the PS1 photometric calibration precisions in the grizy filters are around 5–7 mmag when averaged over 14′ regions. We note a much larger calibration error up to 0.04 mag in

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Baransky, A., O. Lukina, and S. Borysenko. "Astrometric and photometric observations of six brightest trans-Neptunian objects at the Kyiv comet station." Advances in Astronomy and Space Physics 10, no. 2 (2020): 48–54. http://dx.doi.org/10.17721/2227-1481.10.48-54.

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In this work we focused on observations of six trans-Neptunian objects (TNOs) whose apparent magnitudes are brighter than 20m. We present the results of astrometric and photometric observations of (134340) Pluto, (136108) Haumea, (136472) Makemake, (136199) Eris, (90482) Orcus, and (20000) Varuna obtained at the Kyiv comet station (Code MPC 585) in 2017-2019. For observations we used the 0.7-m (f/4) reflector AZT-8 with FLI PL4710 CCD camera and filters of Johnson-Cousins photometric system. From our images we measured the objects' astrometric positions, calculated apparent magnitudes in the B

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Chakraborty, Krishnasis, Mubeen G, Ritu Kimbahune, Lalitha N, and Yajnesh Pai. "Photometric method for estimation of Magaldrate." Pharma Innovation 4, no. 6b (2015): 60–63. http://dx.doi.org/10.22271/tpi.v4.i6b.01.

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Ryan, P., and D. Sandler. "Scintillation Reduction Method for Photometric Measurements." Publications of the Astronomical Society of the Pacific 110, no. 752 (1998): 1235–48. http://dx.doi.org/10.1086/316248.

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Strel'tsova, E. D., N. Yu Meglitskaya, and N. M. Kvasha. "Photometric method of determining glucose content." Fibre Chemistry 19, no. 1 (1987): 81–83. http://dx.doi.org/10.1007/bf00544631.

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Xiao, Kai, Yang Huang, Haibo Yuan, et al. "Calibration of Complementary Metal-oxide-semiconductor Sensor–based Photometry to a Few-millimagnitude Precision: The Case of the Mini-SiTian Array." Astrophysical Journal Letters 982, no. 1 (2025): L27. https://doi.org/10.3847/2041-8213/adbd3c.

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Abstract We present a pioneering achievement in the high-precision photometric calibration of CMOS-based photometry, by application of the Gaia Blue Photometer or Red Photometer (XP) spectra–based synthetic photometry method to the mini-SiTian array (MST) photometry. Through 79 repeated observations of the f02 field on the night, we find good internal consistency in the calibrated MST G MST-band magnitudes for relatively bright stars, with a precision of about 4 mmag for G MST ∼ 13. Results from more than 30 different nights (over 3100 observations) further confirm this internal consistency, i

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Liang, Junchao, Yude Bu, Kefeng Tan, et al. "Estimation of Stellar Atmospheric Parameters with Light Gradient Boosting Machine Algorithm and Principal Component Analysis." Astronomical Journal 163, no. 4 (2022): 153. http://dx.doi.org/10.3847/1538-3881/ac4d97.

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Abstract In this paper, we propose a new method to estimate stellar atmospheric parameters with photometric data, which is based on principal component analysis (PCA) and light gradient boosting machine (LightGBM) algorithms. We first use PCA to transform all band photometric data (u, v, g, r, i, and z) and then utilize LightGBM to estimate stellar atmospheric parameters. The experimental results show that the root mean square errors of the method for estimating the effective temperature, surface gravity, and metallicity are 90 K, 0.40 dex, and 0.20 dex, respectively. We then compare PCA + Lig

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Leistedt, Boris, Justin Alsing, Hiranya Peiris, Daniel Mortlock, and Joel Leja. "Hierarchical Bayesian Inference of Photometric Redshifts with Stellar Population Synthesis Models." Astrophysical Journal Supplement Series 264, no. 1 (2023): 23. http://dx.doi.org/10.3847/1538-4365/ac9d99.

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Abstract We present a Bayesian hierarchical framework to analyze photometric galaxy survey data with stellar population synthesis (SPS) models. Our method couples robust modeling of spectral energy distributions with a population model and a noise model to characterize the statistical properties of the galaxy populations and real observations, respectively. By self-consistently inferring all model parameters, from high-level hyperparameters to SPS parameters of individual galaxies, one can separate sources of bias and uncertainty in the data. We demonstrate the strengths and flexibility of thi

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de Jaeger, T., S. González-Gaitán, J. P. Anderson, et al. "AHUBBLEDIAGRAM FROM TYPE II SUPERNOVAE BASED SOLELY ON PHOTOMETRY: THE PHOTOMETRIC COLOR METHOD." Astrophysical Journal 815, no. 2 (2015): 121. http://dx.doi.org/10.1088/0004-637x/815/2/121.

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Language, B., S. J. Piketh, and R. P. Burger. "Correcting respirable photometric particulate measurements using a gravimetric sampling method." Clean Air Journal 26, no. 1 (2016): 10–14. http://dx.doi.org/10.17159/2410-972x/2016/v26n1a7.

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According to the National Environmental Management: Air Quality Act of 2004 people have the right to clean air and a healthy environment. Particulate matter (PM) emissions pose a significant health threat. Both indoor and ambient air pollution contribute to the burden of disease associated with poor air quality. This is particularly true within the South African setting where low income households make use of different solid fuels for heating and cooking purposes resulting in high levels of PM emissions. This paper focuses on the evaluation mass concentration measurements recorded by continuou

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Cooke, Benjamin F., and Don Pollacco. "specphot: a comparison of spectroscopic and photometric exoplanet follow-up methods." Monthly Notices of the Royal Astronomical Society 495, no. 1 (2020): 734–42. http://dx.doi.org/10.1093/mnras/staa1194.

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ABSTRACT We set out a simulation to explore the follow-up of exoplanet candidates. We look at comparing photometric (transit method) and spectroscopic (Doppler shift method) techniques using three instruments: Next-Generation Transit Survey, High-Accuracy Radial-velocity Planetary Search, and CORALIE. We take into account the precision of follow-up and required observing time in attempt to rank each method for a given set of planetary system parameters. The methods are assessed on two criteria: signal-to-noise ratio (S/N) of the detection and follow-up time before characterization. We find tha

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Yuldoshev, Q., M. Muminov, V. Andruk, Sh Ehgamberdiev, and S. Turaev. "Test of the scanner for expression the astrometric and photometric parameters from the digitized plates." «Узбекский физический журнал» 24, no. 2 (2022): 81–89. http://dx.doi.org/10.52304/.v24i2.324.

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This paper performs to research in detail the Epson Expression 10000XL scanner for photographic astroplate archive of the Ulugh Beg Astronomical Institute (UBAI) of the Uzbekistan Academy of Sciences. For processing the astroplates, it is used special developed software in the LINUX/MIDAS/ROMAFOT. The test plate was digitized with grayscale 8 and 16 bits with various scanner resolutions. Astronomical and photometric parameters were carried out from the plate and an evaluation of the developed method accuracy for determining rectangular coordinates and photometry. The repeatability of astrometr

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Wright, Angus H., Hendrik Hildebrandt, Jan Luca van den Busch, and Catherine Heymans. "Photometric redshift calibration with self-organising maps." Astronomy & Astrophysics 637 (May 2020): A100. http://dx.doi.org/10.1051/0004-6361/201936782.

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Accurate photometric redshift calibration is central to the robustness of all cosmology constraints from cosmic shear surveys. Analyses of the Kilo-Degree Survey (KiDS) re-weighted training samples from all overlapping spectroscopic surveys to provide a direct redshift calibration. Using self-organising maps we demonstrate that this spectroscopic compilation is sufficiently complete for KiDS, representing 99% of the effective 2D cosmic shear sample. We used the SOM to define a 100% represented “gold” cosmic shear sample, per tomographic bin. Using mock simulations of KiDS and the spectroscopic

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Bradač, Maruša, Kuang-Han Huang, Adriano Fontana, et al. "Hubble Frontier Field photometric catalogues of Abell 370 and RXC J2248.7−4431: multiwavelength photometry, photometric redshifts, and stellar properties." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 99–107. http://dx.doi.org/10.1093/mnras/stz2119.

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ABSTRACT This paper presents multiwavelength photometric catalogues of the last two Hubble Frontier Fields (HFFs), the massive galaxy clusters Abell 370 and RXC J2248.7−4431. The photometry ranges from imaging performed on the Hubble Space Telescope to ground-based Very Large Telescope and Spitzer/Infrared Array Camera, in collaboration with the ASTRODEEP team, and using the ASTRODEEP pipeline. While the main purpose of this paper is to release the catalogues, we also perform, as a proof of concept, a brief analysis of z &gt; 6 objects selected using dropout method, as well as spectroscopi

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Sukhov, Peter P., Vitaly P. Yepishev, Konstantin P. Sukhov, Alexei L. Pavlovskyi, and Sergei A. Mamrai. "DETERMINATION DEGRADATION OF SATELLITE SURFACE OPTICAL FEATURES BY PHOTOMETRIC METHOD." Odessa Astronomical Publications 35 (December 14, 2022): 81–86. http://dx.doi.org/10.18524/1810-4215.2022.35.268215.

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A method is described for using photometric data to estimate the reflective properties of a satellite's surface material under conditions of its long stay in space. The technique of multicolour photometric B,V,R observations of several geostationary satellites built on different types of tires is shown, and the results obtained over a period of 3 to 9 years. These are geostationary satellites Astra 2E (on the Eurostar E3000 bus), Azerspace 2/Intelsat 38 (on the SSL-1300 bus), Sicral 2 (on the Spacebus-4000B2 platform) and Blagovest 11L (the Ekspress-2000 bus). It has been revealed that a patte

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Yu, Chanki, and Sang Wook Lee. "Deep Photometric Stereo Network with Multi-Scale Feature Aggregation." Sensors 20, no. 21 (2020): 6261. http://dx.doi.org/10.3390/s20216261.

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We present photometric stereo algorithms robust to non-Lambertian reflection, which are based on a convolutional neural network in which surface normals of objects with complex geometry and surface reflectance are estimated from a given set of an arbitrary number of images. These images are taken from the same viewpoint under different directional illumination conditions. The proposed method focuses on surface normal estimation, where multi-scale feature aggregation is proposed to obtain a more accurate surface normal, and max pooling is adopted to obtain an intermediate order-agnostic represe

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Ďurech, Josef, Josef Hanuš, Victor M. Alí-Lagoa, Marco Delbo, and Dagmara A. Oszkiewicz. "WISE data and sparse photometry used for shape reconstruction of asteroids." Proceedings of the International Astronomical Union 10, S318 (2015): 170–76. http://dx.doi.org/10.1017/s1743921315008492.

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AbstractAsteroid disk-integrated sparse-in-time photometry can be used for determination of shapes and spin states of asteroids by the lightcurve inversion method. To clearly distinguish the correct solution of the rotation period from other minima in the parameter space, data with good photometric accuracy are needed. We show that if the low-quality sparse photometry obtained from ground-based astrometric surveys is combined with data from the Wide-field Infrared Survey Explorer (WISE) satellite, the correct rotation period can be successfully derived. Although WISE observed in mid-IR wavelen

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