Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4678: 1988W, 1988X; 1988V; alpha Com

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 4677  SEARCH Read IAUC 4679
IAUC number

                                                  Circular No. 4678
Central Bureau for Astronomical Telegrams
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

     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of two apparent supernovae on a 15301 plate taken Nov. 17.20 UT; a
confirmation plate (IIIa-J emulsion) was taken Nov. 21.21.  SN 1988W
is located at R.A. = 9h39m44.70, Decl. = +26 57'49.4 (equinox 1950.0),
in an anonymous galaxy at R.A. = 9h39m45.86, Decl. = +26 57' 44.9; the
supernova was at mag 20.8 (+/- 0.3) on Nov. 17 and 20.2 (+/- 0.3) on
Nov. 21.  SN 1988X is located at R.A. = 9h20m35.51, Decl. = +25 59'04.0,
in another anonymous galaxy (listed by Zwicky and Herzog 1963, Cat. of
Galaxies and Clusters of Galaxies II, p. 154, at R.A. = 9h20.5, Decl. =
+25 59'); the galaxy's nucleus contains two apparent condensations at
(end figures) 34s.76, 04".3; 34s.98, 02".8.  SN 1988X was at mag 20.0
(+/- 0.3) on Nov. 17 and 19.6 (+/- 0.3) on Nov. 21.

     M. Turatto, E. Cappellaro, and L. M. Buson, Asiago Astronomical
Observatory, report the following photometry of SN 1988V (cf. IAUC
4675, 4676) derived from CCD frames obtained with the 1.82-m telescope
at Cima Ekar:  Nov. 14.81 UT, R = 17.70; 14.83, V = 17.55; 15.78, R =
17.80; 15.80, V = 17.65; 15.83, B = 18.80.  At discovery on Nov. 6.85,
the object was at V = 17.2, whereas a pre-discovery plate secured on
Oct. 9 shows no object brighter than 17.5.

     D. Barry, Center for High Angular Resolution Astronomy, Georgia
State University, writes:  "B. Hartkopf, using positional data that
he and H. McAlister obtained over the last 12 years with speckle
interferometry, has calculated a high-precision orbit for alpha Com,
yielding an inclination of 90.063 +/- 0.04 and predicting that an
eclipse will occur near 1989 Feb. 15 (+/- 2 weeks).  This system, long
known to be double, has a period of 25.804 yr, and although it has
been suspected as liable to eclipse (e.g., Lippincott 1961, A.J. 66,
272), one has never been observed.  Hartkopf's calculations show a
1.3-day eclipse with a fading of about 0.1 mag, although within one sigma
error in inclination the eclipse could be either central (0.8-mag
fading) or might not occur at all."

1988 November 22               (4678)             Daniel W. E. Green

Read IAUC 4677  SEARCH Read IAUC 4679

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!