Central Bureau for Astronomical Telegrams
IAUC 4872: 1989w; X0331+53
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Read IAUC 4873
Circular No. 4872
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
COMET HELIN-ROMAN-ALU (1989w)
Eleanor F. Helin reports her discovery with Brian P. Roman
and Jeff Alu of another comet with the 0.46-m Schmidt telescope
at Palomar. R. Bambery assisted. The object is diffuse with
some condensation. The following measurements are by Roman:
1989 UT R.A. (1950) Decl. m1
Oct. 2.41510 2 00 24.26 + 2 17 44.3
2.43698 2 00 23.54 + 2 17 39.4 17.5
5.41545 1 58 49.08 + 2 09 30.3
6.33941 1 58 18.79 + 2 06 57.1
6.37483 1 58 17.57 + 2 06 52.5
The following preliminary parabolic elements are from the
above observations; it is likely that this is a short-period comet:
T = 1989 Apr. 20.482 ET Peri. = 226.759
Node = 97.509 1950.0
q = 2.22413 AU Incl. = 6.471
1989 ET R.A. (1950) Decl. Delta r m1
Oct. 1 2 01.12 + 2 21.7 1.941 2.886 17.5
6 1 58.50 + 2 07.9
11 1 55.67 + 1 55.0 1.977 2.955 17.7
16 1 52.73 + 1 43.4
21 1 49.78 + 1 33.6 2.040 3.027 17.9
26 1 46.89 + 1 25.9
31 1 44.17 + 1 20.7 2.130 3.099 18.1
X0331+53
F. Makino and the Ginga Team, Institute of Space and Astronautical
Science, telex: "Follow-up observations with the All Sky Monitor
aboard Ginga showed that the transient x-ray source X0331+53 is still
in a bright state (IAUC 4858). The x-ray intensity in 2-20 keV
remained at 0.3 Crab from Sept. 21 through Oct. 1. A clear absorption
feature, presumably due to cyclotron resonance, was discovered at
about 29 keV in the x-ray spectra taken with the Large Area Counters."
1989 October 6 (4872) Daniel W. E. Green
Read IAUC 4873
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