Physics – Optics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.a54d..06y&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #A54D-06
Physics
Optics
0360 Radiation: Transmission And Scattering, 1221 Lunar And Planetary Geodesy And Gravity (5417, 5450, 5714, 5744, 6019, 6250), 4264 Ocean Optics (0649), 7539 Stellar Astronomy
Scientific paper
Astronomy, satellite, and defense programs require accurate SI traceable standards in space for calibrating telescope-based sensors, assessing their accuracy, and ensuring that their measurements can be compared with other sensors. For satellites, including space-based telescopes, the lack of such standards makes it difficult to ensure that the pre-launch calibration is maintained following exposure of the sensor to launch vibration, high-energy radiation, and out-gassed vapor condensation. Stars have been used for calibration; however star catalogs show discrepancies from 2~% to 5~%, even though approximately 50~% of stars have photometric stabilities greater than 0.5~%. Historically, absolute stellar calibration has been challenged by the lack of available optical standards that closely mimic stellar spectral and angular distributions, of measurement methods to use such standards, and of knowledge of the temporally variable transmittance of the atmosphere. In this talk, we will address these deficiencies with the goal of establishing a suite of SI traceable stars for optical sensor calibration with a radiometric uncertainty of 0.5~% over the spectral range from 380~nm to 2500~nm.
Brown Scott W.
Fraser Gerald T.
Johnson Brett C.
Lykke Keith R.
Yoon Howard W.
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