Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986plas.rept...73b&link_type=abstract
In NASA, Washington Reports of Planetary Astronomy, 1985 p 73-74 (SEE N87-12407 03-89)
Astronomy and Astrophysics
Astronomy
Asteroids, Astrometry, Astronomical Maps, Comets, Light Scattering, Planetary Surfaces, Albedo, Light Curve, Stellar Orbits
Scientific paper
About 3000 accurate positions of asteroids and comets were measured concentrating particularly on close-Earth approachers, but also targeting asteroids in need for follow-up observations because of unusual orbital characteristics or poor observational history. In 1985, 36 of the discoveries were numbered. Very accurate + or - 0.1 arcsec?) positional measurements were made of P/Halley on four nights in November and December 1985 in support of Giotto mission navigation. The asteroid orbit files were maintained, and ephemeris data for observational planning were supplied to colleagues worldwide. Considerable progress was made in understanding how information on asteroid shapes, surface albedo variegation, and rotational states can be derived from lightcurve and phase curve data. The analytical formulation was completed of a new asteroid magnitude system for the International Astronomical Union; the system was adopted at the New Delhi General Assembly by IAU Commission 20. Photographic photometry of about 10000 images of faint asteroids observed during the course of the United Kingdom Schmidt-CalTech Asteroid Survey in 1981 was continued, completing the microdensitometric scanning and all process of software development for data handling.
Bowell Edward L. G.
Bus Schelte J.
Kreidl J. N. T.
Lumme Kari
Skiff Brian A.
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