Circular No. 7112

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)

        URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304

Phone 617-495-7244/7440/7444 (for emergency use only)

COMET C/1999 D1 (HERMANN)

Precise positions (CCD unless otherwise stated):

1999 UT α_{2000} δ_{2000} m_{1} Observer
Feb. 21.51114 12^{h}14^{m}18.^{s}13 +2^{o}50′03′′.7 17.9 Scotti
21.51682 12 14 17.89 +2 49 54.1 17.9  _{”}
21.71693 12 14 10.36 +2 44 24.7 17.3 Kojima
21.72361 12 14 10.00 +2 44 12.8 19.1 Seki
21.72999 12 14 09.80 +2 44 02.1 17.2 Kojima
22.09322 12 13 55.80 +2 34 12.0 17.3 Jacques
22.10294 12 13 55.39 +2 33 56.2 17.4  _{”}
22.38877 12 13 43.15 +2 25 53.1  Shelus
22.39977 12 13 42.65 +2 25 34.8  _{”}
22.61012 12 13 34.43 +2 19 44.0 17.5 Sugie
22.63839 12 13 33.08 +2 18 57.8  _{”}
22.64268 12 13 32.81 +2 18 50.1  Asami

J. V. Scotti (Kitt Peak). 0.9-m Spacewatch telescope. m_{2} = 20.2. Coma

diameter 13′′.0. Tail 2′.17 long in p.a. 300^{o}. T. Kojima (Chiyoda). 0.25-m f/6.0 reflector. Faint tail in p.a. 300^{o}. T. Seki (Geisei). 0.6-m f/3.5 reflector. Photographic observation. C. Jacques (Serra da Piedade). 0.3-m f/3.3 Schmidt-Cassegrain. P. J. Shelus, J. G. Ries and J. L. Africano (McDonald). 0.76-m reflector. A. Sugie (Dynic). 0.60-m f/5.0 reflector. Communicated by S. Nakano. A. Asami (Hadano). 0.28-m f/5.0 reflector. Communicated by S. Nakano.

The following parabolic orbital elements are from 21 observations Feb. 20–22. The comet is probably of short period.

T = 1999 Feb. 18.059 TT  ω = 173.^{o}497
Ω = 350.549 }2000.0
q = 1.81337 AU  i = 25.772
1999 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Feb. 21 12^{h}14.^{m}64 + 3^{o}04.^{′}2 0.891 1.814 149.^{o}5 16.^{o}1 17.3
26 12 11.02 + 0 45.5 0.871 1.816 154.7 13.5 17.3
Mar. 3 12 06.59 − 1 34.8 0.858 1.821 159.8 10.8 17.3
8 12 01.53 − 3 54.6 0.852 1.828 164.7  8.2 17.3
13 11 56.03 − 6 11.3 0.852 1.837 168.7  6.1 17.3
18 11 50.34 − 8 22.3 0.859 1.848 170.4  5.1 17.3
23 11 44.71 −10 25.7 0.874 1.861 168.9  5.9 17.4
1999 February 22  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1999 CBAT  Brian G. Marsden