Central Bureau for Astronomical Telegrams
IAUC 4816: 1989o; mu Cen; V404 Cyg; 1989B
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Circular No. 4816
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
PERIODIC COMET BRORSEN-METCALF (1989o)
A. Schultz, U. Fink and M. DiSanti, University of Arizona, report
that spectra obtained on July 13.46 UT with the 1.54-m Catalina
reflector and the LPL CCD and spectrograph system showed emissions of
C2, NH2, O I[1D], H2O+ and CN, as well as a weak continuum with flat
albedo. The C2 emission strengths were comparable to those of
P/Halley, but NH2 was down. The ratio of O I emission to continuum
integrated over 60" along the slit at 630 nm was 6.9. (This ratio for
P/Halley was 0.95 at the same heliocentric distance.) The O I 630-nm
luminosity was measured as 1.52 x 10**27 photon/s. This translates
into a production rate for H2O of 2.46 x 10**28 s-1, which is a factor
of 7.0 smaller than was measured for P/Halley at the same heliocentric
distance (1.36 AU) before perihelion.
mu CENTAURI
G. J. Peters, Space Sciences Center, University of Southern
California, communicates: "An H-alpha spectrum of mu Cen taken on June
13 with the coude feed telescope + TI3 CCD detector at Kitt Peak
National Observatory during a 'request night' reveals that the
emission outburst reported by J. C. Bhattacharyya et al. (IAUC 4806)
was well underway by mid-June. The double H-alpha emission feature
observed with a peak intensity of 1.2 Icont (V/R about 1.7) clearly
establishes this as the strongest outburst since those of 1980 and
1983-84 (cf. Peters 1986, Ap.J. 301, L61 and references therein) and
further observations are urged."
V404 CYGNI
R. D. Gehrz, J. Johnson and T. Harrison, University of Minnesota,
report that observations on July 20.42 UT with the Minnesota InSb
photometer on the Wyoming 2.34-m infrared telescope gave J = 11.21, H
= 10.21, K = 9.44, L' = 8.03 (uncertainty 0.05 mag in each case).
SUPERNOVA 1989B IN NGC 3627
Further visual magnitude estimates: Apr. 24.1 UT, 15.6 (T.
Martinez, Cleveland, MO); May 1.88, 15.0 (M. Verdenet, Bourbon-Lancy,
France); 4.88, 15.6: (S. Korth, Dusseldorf, West Germany); 6.4, 15.7
(S. H. Lucas, Mansfield, OH); 7.25, 15.5 (B. Archinal, Mansfield, OH);
8.1, 15.7 (Martinez); June 7.09, 16.0 (R. Bunge, Mansfield, OH).
1989 July 21 (4816) Brian G. Marsden
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