Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348.1020a&link_type=abstract
Astronomy and Astrophysics, v.348, p.1020-1034 (1999)
Astronomy and Astrophysics
Astrophysics
22
Radiation Mechanisms: Thermal, Comets: General, Comets: Individual: C/Hyakutake, Comets: Individual: Hale-Bopp, Radio Continuum: Ism
Scientific paper
We have observed both Comets Hyakutake and Hale-Bopp close to perigee with several telescopes at frequencies between 30 and 860 GHz for an extended period of time. The observed ``light" curves can be described as a simple function of heliocentric and geocentric distances without any outburst or noticeable variability with time. Our most sensitive diameter estimate for C/Hyakutake resulted in an upper limit of 2.1 km. The nuclear diameter of C/Hale-Bopp was determined to 44.2 km after separation from the halo emission. The central part of both halos can be represented by a Gaussian with a linear size at half power points of 1870 and 11080 km for Hyakutake and Hale-Bopp, respectively. The spectral index for both comets is alpha = 2.8, indicating a similar particle size distributions in the halo of these comets. For Hale-Bopp the extended emission could be traced to more than 10(5) km from its nucleus. The derived masses, contained in the halo depend strongly on the assumed physical properties of the halo particles. With kappa (1mm) = 75 cm(2) /g, possibly more appropriate for comets, a halo mass of 6 10(10) g is derived for Hyakutake and of 8 10(12) g for Hale-Bopp.
Altenhoff Wilhelm J.
Bieging John H.
Butler Bart
Butner Harold M.
Chini Rolf
No associations
LandOfFree
Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1454201