K-band Radio Observations of Comet Hale-Bopp: Detections of Ammonia and (Possibly) Water

Details K-band Radio Observations of Comet Hale-Bopp: Detections of Ammonia and (Possibly) Water K-band Radio Observations of Comet Hale-Bopp: Detections of Ammonia and (Possibly) Water

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997em%26p...78...21b&link_type=abstract

Earth, Moon, and Planets, v. 78, Issue 1/3, p. 21-28 (1997).

Astronomy and Astrophysics

Astronomy

18

Radio Line Emission, Comets, Comet Hale-Bopp

Scientific paper

K-band radio observations of comet Hale-Bopp (C/1995 O1) were conducted in March/April 1997 at the 100-m Telescope of the Max-Planck-Institut für Radioastronomie. Emission was firmly detected from the five lowest metastable (J = K)inversion transitions of ammonia. Assuming a thermal distribution for the metastable states of NH3, we derive a rotational temperature of 104 ± 30 K and an ammonia production rate at perihelion of6.6 ± 1.3 × 1028 s-1.The updated ammonia-to-water abundance ratio is found to be of the order of 1.0%. We also report a marginal detection of the 616 523transition line of water at λ = 1.35 cm.

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