Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985spfl...27..221j&link_type=abstract
Spaceflight (ISSN 0038-6340), vol. 27, May 1985, p. 221-224.
Astronomy and Astrophysics
Astronomy
Iras-Araki-Alcock Comet, Radar Astronomy, Ephemerides, Power Spectra, Superhigh Frequencies, Ultrahigh Frequencies, Comets, Iras-Araki-Alcock, Radar Methods, Popular, Mission Description, History, Equipment, Earth-Based Observations, Spectra, Analysis, Procedure, Techniques, Astronomy, Physical Properties
Scientific paper
IRAS data in April 1983 held evidence for the approach of a comet which would pass close enough to earth to bounce radar signals off the cometary nucleus. The closest pass was calculated to be 450,000 km. Ephemerides were prepared for the object while radio observatory tracking schedules were arranged. S-band observations were selected for the JPL 64 m antenna to obtain 2.7 arcmin resolution. A 400 kW signal was generated. Two 4 hr observational periods were achieved, revealing a rough, faceted surface by using S-band in the first run and the X-band in the second. The comet was concluded irregularly shaped and roughly elliptical, with a 2 d period.
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