Abstract

The first pictures of the nucleus of Comet Halley were returned from the CCD TV system (TVS) placed onboard the two Soviet spacecraft Vega 1 and 2. Comet Halley was observed from 4 to 11 Mar. 1986, and ∼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.

© 1987 Optical Society of America

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