Central Bureau for Astronomical Telegrams
IAUC 3967: 1984i; SN IN NGC 1559; AM Her
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 3968
Circular No. 3967
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
COMET AUSTIN (1984i)
E. Gerard and J. P. Drouhin, Nancay Radio Observatory, telex:
"The principal 0.18-m OH lines were detected in absorption on July
27, 28 and 29 with the Nancay radio telescope. The antenna temperatures
at 1667 and 1665 MHz were -50 +/- 10 and -30 +/- 10 mK, respectively.
The average production rate was 3 x 10**28 OH molecules
per second, which is three times larger than expected from the
total visual magnitude at discovery and assuming an inverse-square
dependence of the production rate on heliocentric distance. The
comet should be detectable in emission during Aug. 7-9 and again
in absorption on Aug. 10 and 11. OH radio observations are
encouraged all the way in to perihelion."
Total visual magnitude estimates: July 19.92 UT, 6.3 (V. F.
de Assis Neto, Sao Francisco de Oliveira, Brazil, 10 x 70 binoculars);
21.35, 6.0 (R. H. McNaught, Coonabarabran, N.S.W., 9 x 63
binoculars); 22.91, 6.1 (de Assis Neto); 28.36, 6.8 (McNaught);
31.37, 6.3 (McNaught; tail 2.1 deg long in p.a. 29).
SUPERNOVA IN NGC 1559
R. Buta, Mount Stromlo and Siding Spring Observatories, reports
that photoelectric observations with the Siding Spring 0.6-m
telescope show this supernova to be almost exactly coincident with
the nucleus of the NGC 1559. Uncorrected for the background
contribution of the galaxy, the measured magnitude and colors on Aug.
1.77 UT in a 13"2 aperture were V = 12.88, B-V = +0.55, U-B =
-0.32. Veron et al. (1982, A. Ap. 113, 46) measured the following
magnitude and colors for the galaxy alone using a centered 15"5
aperture: V = 13.67, B-V = +0.68, U-B = +0.11. With approximate
allowance for the difference in aperture using a standard growth
curve, the corrected figures for the supernova alone become V =
13.40, B-V = +0.48, U-B = -0.49. The very blue U-B suggests that
the supernova is not of type I, but it could be of type II.
AM HERCULIS
Visual magnitude estimates by M. Verdenet, Bourbon-Lancy,
France: May 3.9 UT, 14.8; 17.9, 15.0; 28.9, 14.9; June 13.9, 13.8;
17.9, 13.0; 22.9, 12.8; 26.9, 12.5; July 1.9, 12.8; 3.9, 13.3.
1984 August 3 (3967) Brian G. Marsden
Read IAUC 3968
Our Web policy. Index to the CBAT/MPC/ICQ pages.
