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Cbet 4464, ich habs vergessen, drunterzuschreiben. Hier der originale Text:
. Wierzchos and M. Womack, University of South Florida, report on
observations of CO and HCN in comet C/2016 R2 (cf. CBET 4318) with the
Arizona Radio Observatory's 10-m Submillimeter Telescope at Mount Graham:
"We have detected the CO J=2-1 rotational line at 230 GHz on Dec. 22 and 23
UT with a line intensity of TR* = 0.31 K with rms 0.05 K. The CO FWHM
linewidth is about 0.7 km/s, and the line center is approximately 0.2 km/s
blue-shifted from the ephemeris velocity. We also searched for the HCN J=3-2
rotational transition at 265 GHz and detected nothing down to a 1-sigma level
of TR* = 0.013 K. Assuming a rotational temperature of 30 K and expansion
velocity of 0.7 km/s, we calculate a production rate of Q(CO) approximately
4.7 x 10**28 molecules/s and a 3-sigma upper limit of Q(HCN) < 3.6 x 10**25
molecules/s at r = 2.9 AU and Delta = 2.1 AU. For comparison, this comet
produced almost a third of the CO that comet C/1995 O1 (Hale-Bopp) did at
the same heliocentric distance. This comet appears to be very CO-rich, and
we estimate Q(CO)/Q(HCN) > 1300. Further observations are encouraged as
the comet approaches perihelion in 2018 May, when it will reach r = 2.6 AU."
_________________ Uwe Pilz, Fachgruppen Kometen und Astrophysik/Algorithmen.
Oft benutzte Instrumente: Fujinon 16x70 FMT-SX-2, TMB Apo 105/650, Skywatcher Evostar 120/900 ED, Ninja Dobson 320/1440, Smartscope Dwarf-3
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