Central Bureau for Astronomical Telegrams
IAUC 4689: 1987A; P/SCHWASSMANN-WACHMANN 1; U Gem; R CrB
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Circular No. 4689
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
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
H. Moseley, NASA Goddard Space Flight Center; E. Dwek, W. Glaccum,
J. Graham, R. Loewenstein and R. Silverberg report the results of far-
infrared spectrophotometry obtained on Nov. 17 and 24 using the Kuiper
Airborne Observatory. The observations cover the 16-30-micron spectral
range with spectral resolving power about 40. The spectrum reveals a
strong continuum that falls slightly from 16 to 28 microns with weak
emission from [Fe I], [Fe II] and [S I] fine-structure lines. The
continuum is about a factor of three stronger than in measurements made
in March, while the [Fe II] lines are a factor of 3 to 5 weaker than in
March. A similar increase in the 10-micron continuum and decline in
fine-structure lines in that spectral region were reported on IAUC 4645.
The ratio of [Fe I] to [Fe II] lines gives some evidence for a decrease
in ionization level, but the overall reduction in line strengths is much
greater than can be explained by this change in ionization.
PERIODIC COMET SCHWASSMANN-WACHMANN 1
Total magnitude estimates: Oct. 31.18 UT, 13.4 (C. S. Morris,
Pine Mountain Club, CA, 0.26-m reflector, visual); Dec. 1.44, [16
(T. Kojima, 0.25-m Wright-Schmidt); 5.39, 14 (Kojima); 6.39, 14.5
(T. Nakamura and J. Souchay, Kiso Observatory, 1.05-m Schmidt;
coma diameter 0.3 arcmin, strong condensation); 7.40, 14.8
(Nakamura and Souchay; condensation fainter); 7.43, 14.6 (J.
Watanabe, K. Takagishi, G. Minagi, H. Sugino and T. Kuroki,
Kagoshima Space Center, 0.60-m reflector + CCD; coma 0.3 arcmin
north-south, 0.4 arcmin in p.a. 100-280 deg).
U GEMINORUM
Visual magnitude estimates: Dec. 6.90 UT, 8.9 (R. Bouma, Groningen,
The Netherlands); 7.92, 9.5 (G. Comello, Roden, The Netherlands; the
times initially reported on IAUC 4687 are apparently correct).
R CORONAE BOREALIS
Visual magnitude estimates: Oct. 21.75 UT, 9.7 (S. Baroni, Milan, Italy);
31.71, 10.0 (A. Boattini, Florence, Italy); Nov. 10.0, 10.2 (J. Bortle,
Stormville, NY); 18.0, 10.0 (Bortle); 26.22, 9.9 (Boattini); 29.4, 10.4
(Bortle); Dec. 5.27, 10.4 (A. Pereira, Linda-A-Velha, Portugal).
1988 December 8 (4689) Brian G. Marsden
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