Central Bureau for Astronomical Telegrams
IAUC 4001: 1984n; 2S 0142+61; SN IN NGC 991
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Read IAUC 4002
Circular No. 4001
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 617-495-7244/7440/7444
PERIODIC COMET KOWAL-MRKOS (1984n)
A. Mrkos, Klet Observatory, provides additional observations:
1984 UT R.A. (1950.0) Decl. m1
May 19.91340 13 06 58.68 -10 04 20.6 16.0
19.92752 13 06 58.95 -10 04 18.2
Improved orbital elements from 8 observations Apr. 23-May 19:
T = 1984 June 7.6307 ET
Peri. = 338.1046 e = 0.482556
Node = 248.4996 1950.0 a = 3.770605 AU
Incl. = 2.9568 n = 0.1346132
q = 1.951075 AU P = 7.322 years
1984 ET R.A. (1950.0) Decl. p r m1
Oct. 7 16 45.91 -21 10.0 2.534 2.199 18.4
17 17 07.86 -21 37.8
27 17 29.86 -21 54.7 2.789 2.277 18.8
Nov. 6 17 51.80 -22 00.6
16 18 13.56 -21 55.3 3.033 2.360 19.1
26 18 35.04 -21 39.1
Dec. 6 18 56.16 -21 12.6 3.257 2.449 19.5
2S 0142+61
The following remarks should have been included in the item by
White et al. on IAUC 3996: "The EXOSAT CMA 10" error circle is
centered at R.A. = 1h42m52s9, Decl. = +61deg29'49" (equinox 1950.0), and
overlaps the Einstein HRI position (obtained from the Einstein
data base) of R.A. = 1h42m53s7, Decl. = +61deg30'05". F. Seward notes that
the 90-percent-confidence random uncertainty in the Einstein
position is 3", but this particular position may have an additional
systematic offset of 5". Using the star numbering convention of
Reid et al. (1980, A.J. 85, 1062), we note that star 3 lies 10"
and 18", and that star 8 lies 8" and 12", respectively, from the
centers of the EXOSAT and Einstein HRI error circles."
SUPERNOVA IN NGC 991
Visual magnitude estimates by R. McNaught, Coonabarabran, NSW:
Sept. 3.67 UT, 14.1; 6.80, 14.4; 22.69, 15.0; Oct. 15.55, 15.8.
1984 October 25 (4001) Brian G. Marsden
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