Central Bureau for Astronomical Telegrams
IAUC 3799: 1983d
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 3800
Circular No. 3799
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
COMET IRAS-ARAKI-ALCOCK (1983d)
V. Smith, McDonald Observatory, reports that visual observations
at the coude focus of the 2.7-m reflector on May 5.4 UT in
2" seeing showed no real structure but a stellar nucleus.
Digicon-scanner spectra (12-nm bandwidth) showed the nucleus to be
dominated by reflected sunlight: some faint C-2 (516-nm) emission
was detected from a very faint extension 5" to the northeast.
The following improved parabolic orbital elements have been
derived by the undersigned from 15 observations Apr. 27 to May 6:
Epoch 1983 May 10.0 ET
T = 1983 May 21.1865 ET Peri. = 192.7842
Node = 48.3985 1950.0
q = 0.991381 AU Incl. = 73.3775
The perturbations during May 10.0-14.0 amount to Delta-T = -0.0025 day,
Delta-Peri. = -0.0030 deg, Delta-Node = 0.0000 deg, Delta-Incl. =
-0.0037 deg, Delta-q = +0.000006 AU, Deltae = +0.000167. The ephemeris
uncertainty is estimated to be up to 5'.
1983 ET R.A. (1950.0) Decl. p r m1
May 8.0 18 15.29 +61 47.9 0.094 1.017 4.4
8.5 17 59.73 +64 08.7
9.0 17 34.56 +67 04.3 0.071 1.013 3.8
9.5 16 48.80 +70 34.3
10.0 15 15.38 +73 45.2 0.049 1.010 3.0
10.1 14 47.59 +74 04.0
10.2 14 16.72 +74 08.8 0.045 1.009 2.8
10.3 13 43.53 +73 55.4
10.4 13 09.24 +73 20.2 0.042 1.009 2.6
10.5 12 35.33 +72 20.0
10.6 12 03.20 +70 53.2 0.039 1.008 2.5
10.7 11 33.84 +68 59.4
10.8 11 07.73 +66 39.4 0.036 1.007 2.3
10.9 10 44.92 +63 54.6
11.0 10 25.21 +60 46.9 0.034 1.007 2.2
11.1 10 08.23 +57 18.7
11.2 9 53.60 +53 32.8 0.032 1.006 2.1
11.3 9 40.97 +49 32.4
11.4 9 30.01 +45 21.3 0.031 1.006 2.0
11.5 9 20.46 +41 03.4
11.6 9 12.09 +36 42.9 0.031 1.005 2.0
1983 May 6 (3799) Brian G. Marsden
Read IAUC 3800
Our Web policy. Index to the CBAT/MPC/ICQ pages.
