Radio observations of comet Bradfield /1978c/

Details Radio observations of comet Bradfield /1978c/ Radio observations of comet Bradfield /1978c/

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978msngr..13....8d&link_type=abstract

ESO Messenger, June 1978, p. 8-10.

Astronomy and Astrophysics

Astronomy

1

Comets, Radio Astronomy, Ephemerides, Hydroxyl Radicals, Radio Spectra, Solar Orbits

Scientific paper

Radio observations at 18 cm wavelength of OH in comet Bradfield (1978c) are discussed which were performed in March 1978. The comet was detected in emission on March 11 and 12, then in absorption on March 14 and 15; the sign change of the signal on March 13 is identified as a direct consequence of the Swings effect, whereby the population of the ground-state Lambda doublet critically depends on heliocentric radial velocity. The final OH radio spectrum of comet Bradfield is presented. It is shown that the OH line profile was well centered at the radial velocity of the nucleus, the line width was the expected value of about 3 km/s, but the amplitude was only 10 mK. From model calculations it is concluded that the OH production rate was seven times smaller than that anticipated from the total visual brightness announced in early February 1978 but was in satisfactory agreement with the visual magnitude of 8.6 plus or - 0.3 observed between March 9 and 17.

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