Physics – Optics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.4457a&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 26, Oct. 15, 1987, p. 4457-4468.
Physics
Optics
3
Astronomical Photometry, Cameras, Charge Coupled Devices, Comet Nuclei, Halley'S Comet, Vega Project, Calibrating, Digital Data, Pixels, Spectral Sensitivity
Scientific paper
The first pictures of the nucleus of Comet Halley were returned from the CCD TV system placed onboard the two Soviet spacecraft Vega 1 and 2. Comet Halley was observed from 4 to 11 Mar. 1986, and about 1500 images were transmitted to the earth. The raw data are given in digital numbers which must be converted into units of brightness. After a brief description of the experiment, the on-ground calibration tests are discussed. Many images were registered and processed to obtain standard correcting images and absolute calibration. Photometric performance could also be checked during flight with observations of Jupiter; in-flight and on-ground performances are compared.
Abergel Alain
Avanesov G. A.
Bertaux Jean Loup
Tarnopol'Skii V. I.
Zhukov B. S.
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