Central Bureau for Astronomical Telegrams
IAUC 4678: 1988W, 1988X; 1988V; alpha Com
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Circular No. 4678
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
SUPERNOVAE 1988W AND 1988X
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.
SUPERNOVA 1988V IN ANONYMOUS GALAXY
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.
alpha COMAE BERENICES
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
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