Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005kfnts...5..458j&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, Suppl, v. 5, p. 458-464
Other
1
Scientific paper
In November 2003 Comet 2P/Encke was observed simultaneously with the 10-m Heinrich--Hertz Submillimeter Telescope on Mount Graham, Arizona, USA, and the 2-m optical telescope on Mount Rozhen, Bulgaria. Simultaneous radio observations of the 4--3 and 3--2 rotational transitions of HCN and the 0--0 transition of the CN violet band system provide a three-dimensional view on the comet. The observations are consistent with outgassing from the source region I with location and pole position of Comet Encke taken from [14]. The outflow speed is 1.2 km. There is some evidence for another possible parent for CN besides HCN. The visual dust coma of Comet Encke is nearly spherical with a diameter of about 1000 km and a slight extension into Comet Encke's fan. The polarization of the observed NH2 transition at 662 nm is 7% at a phase angle of 94.5°, close to the value for two-atomic molecules. At this phase angle and a wavelength of 642 nm the polarization of Comet Encke's dust is greater than 30%, i.e., exceeds the value for so-called dusty comets.
Bonev Tanyu
Hartogh Paul
Jockers Klaus
Kiselev Nikolai N.
Szutowicz Slawomira
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