Central Bureau for Astronomical Telegrams
IAUC 4725: 1989f; 1987A
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Read IAUC 4726
Circular No. 4725
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 SHOEMAKER (1989f)
The following precise positions have been reported:
1989 UT R.A. (1950) Decl. m1 Observer
Jan. 28.51782 9 01 00.80 +51 37 27.3 16 Kojima
28.56296 9 00 59.62 +51 37 46.4 "
28.57986 9 00 58.86 +51 37 55.7 Niijima
28.60683 9 00 58.26 +51 38 06.4 "
28.61829 9 00 57.87 +51 38 11.0 "
T. Kojima (YGCO Chiyoda Observatory). 0.25-m f/3.4 Wright-Schmidt camera.
T. Niijima and K. Kanai (Ojima). 0.30-m f/5.8 reflector.
Parabolic elements by S. Nakano from the seven available positions:
T = 1988 Nov. 2.096 ET Peri. = 18.873
Node = 73.642 1950.0
q = 2.21068 AU Incl. = 25.523
1989 ET R.A. (1950) Decl. Delta r m1
Jan. 14 9 06.60 +49 13.5 1.476 2.364 16.1
24 9 03.05 +51 01.4
Feb. 3 8 58.43 +52 09.9 1.583 2.454 16.4
13 8 54.21 +52 37.7
23 8 51.70 +52 28.5 1.772 2.559 16.8
Mar. 5 8 51.63 +51 48.8
15 8 54.26 +50 45.4 2.029 2.677 17.3
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
P. A. Whitelock and R. M. Catchpole, South African Astronomical
Observatory, report: "Bolometric fluxes derived from U to M photometry
of SN 1987A made between days 633 and 687 show a decline rate with an e-
folding time of 63 days, similar to that observed between days 530 and
580. This suggests that the change in decline rate that occurred
between days 580 and 633 (IAUC 4680, 4690) was a transient dip in an
otherwise almost steady decline. However, two observations made since
day 690 lie systematically brighter by 0.06 magnitude. We note that the
U to M bolometric flux depends critically on the M observations, and
further measurements are required to confirm this latter trend."
1989 January 30 (4725) Brian G. Marsden
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