Deep Space 1 MICAS Observations of 9969 Braille

Details Deep Space 1 MICAS Observations of 9969 Braille Deep Space 1 MICAS Observations of 9969 Braille

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.3403s&link_type=abstract

American Astronomical Society, DPS meeting #31, #34.03

Astronomy and Astrophysics

Astronomy

Scientific paper

The Miniature Integrated Camera Spectrometer (MICAS) on Deep Space 1 is a compact, low power, multichannel imaging spectrometer. Its four sensors, which share a single 10 cm diameter telescope, include a 1024 X 1024 CCD camera, a 256 X 256 active pixel sensor camera, a UV spectrometer covering the 80-185 nm spectral range, and an infrared spectrometer sensitive to the 1200 to 2400 nm range. During the Deep Space 1 flyby of 9969 Braille (1992 KD), measurements were obtained in the two cameras and in the IR spectrometer. A dozen IR spectra were obtained 15 minutes after the spacecraft's closest approach to the asteroid, when it was at a range of about 14,000 km, and at a solar phase angle of about 90 degrees. A combined visual-IR spectrum, spanning the wavelength range between 440 and 2400 nm, was constructed from MICAS IR data and ground-based telescopic observations of Braille obtained by the Deep Space 1 Science Team. The spectrum will be compared to S, V, and Q type asteroids, and to several classes of terrestrial meteorites. The best resolution images of Braille, obtained by the CCD camera a few seconds before the IR spectra, show that the longest dimension of the asteroid is at least 2.1 km. Groundbased lightcurves obtained by the Deep Space 1 MICAS team suggest that the ratio of its long axis to its short axis is at least 2:1.

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