Extinction correction fitting for photometric measurement of space targets

2021 ◽  
Vol 29 (7) ◽  
pp. 1511-1517
Author(s):  
Yi MAN ◽  
◽  
Qing-yun YANG ◽  
Tao CHEN ◽  
Keyword(s):  
Photometric Measurement

Real-time Approximation of Photometric Polygonal Lights

2020 ◽  
Vol 3 (1) ◽  
pp. 1-18
Author(s):  
Christian Luksch ◽  
Lukas Prost ◽  
Michael Wimmer
Keyword(s):  
Real Time ◽  
Specular Reflection ◽  
Near Field ◽  
Measurement Data ◽  
Data Sets ◽  
Photometric Measurement ◽  
Integration Technique ◽  
Time Approximation ◽  
Light Emitter ◽  
Selection Of

We present a real-time rendering technique for photometric polygonal lights. Our method uses a numerical integration technique based on a triangulation to calculate noise-free diffuse shading. We include a dynamic point in the triangulation that provides a continuous near-field illumination resembling the shape of the light emitter and its characteristics. We evaluate the accuracy of our approach with a diverse selection of photometric measurement data sets in a comprehensive benchmark framework. Furthermore, we provide an extension for specular reflection on surfaces with arbitrary roughness that facilitates the use of existing real-time shading techniques. Our technique is easy to integrate into real-time rendering systems and extends the range of possible applications with photometric area lights.

scholarly journals Planet Detection using the Advanced Camera for Surveys on the Hubble Space Telescope

2004 ◽  
Vol 213 ◽  
pp. 107-110
Author(s):  
William B. Sparks ◽  
John Krist ◽  
Mark Clampin ◽  
Holland Ford
Keyword(s):  
Hubble Space Telescope ◽  
Photometric Measurement ◽  
Direct Imaging ◽  
Planet Detection ◽  
Space Telescope ◽  
Advanced Camera For Surveys

The Advanced Camera for Surveys was installed on the Hubble Space Telescope in March 2002. The instrument science team will search for planets using direct imaging with the ACS coronagraph and with precise astrometric and photometric measurement of suitable stars and disks. The camera is operational and performing to expectation.

scholarly journals Mass and Luminosity Function of the Pleiades

1980 ◽  
Vol 85 ◽  
pp. 157-163 ◽  
Author(s):  
Floor van Leeuwen
Keyword(s):  
Proper Motion ◽  
Total Mass ◽  
Luminosity Function ◽  
Mass Range ◽  
Flare Star ◽  
Central Field ◽  
Photometric Measurement ◽  
Proper Motions ◽  
Total Field ◽  
Factor 20

From a proper motion survey by Pels and photometric measurement of selected stars it was found that the Pleiades cluster extends till at least 496 from the centre, corresponding to 10 pc at a distance of 125 pc. It turns out that the luminosity function of the Pleiades is a function of the distance to the centre, the proportion of faint stars increasing with this distance. Because of this, the luminosity function as it was determined before flattened towards fainter stars, whereas for the total field with a diameter of 20 pc one finds a luminosity function that is still increasing at the faint end. Flare star observations in the Pleiades field show that the increase amounts to at least a factor 20 in the mass range 2 to 0.4 M⊙. Accurate proper motions of stars in the projected central field show a dispersion of velocities in the cluster of 700 m/sec. This could indicate a total mass of the Pleiades cluster of the order of 2000 M⊙.

PHOTOMETRIC MEASUREMENT OF BACTERIAL GROWTH

The Lancet ◽  
1946 ◽  
Vol 247 (6406) ◽  
pp. 871
Author(s):  
N.V. Needham
Keyword(s):  
Bacterial Growth ◽  
Photometric Measurement

Serum Iron Determination

1956 ◽  
Vol 2 (3) ◽  
pp. 175-183 ◽  
Author(s):  
George R Kingsley ◽  
Gloria Getchell
Keyword(s):  
Serum Iron ◽  
Isoamyl Alcohol ◽  
Photometric Measurement ◽  
Normal Range ◽  
Iron Determination ◽  
Acid Hydrolysate ◽  
Dry Ashing ◽  
Reproducible Method ◽  
Good Agreement ◽  
Ferrous Complex

Abstract 1. A sensitive, reproducible method for serum iron determination has been developed employing extraction of serum acid hydrolysate with isoamyl alcohol and development of a highly colored ferrous complex of 4,7-diphenyl-1, 1O-phenanthroline for quantitative photometric measurement of iron. 2. The method gives good recoveries and also good agreement with the dry-ashing procedure. 3. A normal range of 120-200 µg./100 ml. (average 160) for the female and 125-238 µg./100 ml. (average 182) for the male for serum iron was obtained by the method.

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