THE ASTRONOMER Electronic Circular No 290 1989 Apr 25  20.13UT.
Telecom Gold 72:MAG60138   JANET:GMH at UK.AC.RO.GREENWICH-STARLINK
Ed:Guy M Hurst, 16, Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP, England. Telephone:(0256)471074.Int:+44256471074
Telex:265871(MONREF G) Quote"72:MAG60138 ATT G.HURST"in FIRST line.
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TA AGM 1989
This year's AGM will be held on (Saturday) 1989 June 24 in
Basingstoke (venue details to be finalised shortly).
We are delighted to announce that Dr. Brian Marsden, of the Central
Bureau for Astronomical Telegrams will be visiting us from USA
and will be our main speaker on this occasion. Please book this
date in your diary and I will send further details very shortly.

SUPERNOVA 1989H and 1989I
C. Pollas, Observatoire de la Cote d'Azur, reports the
discoveries of two apparent supernovae found on plates exposed
with the CERGA Schmidt telescope.  SN 1989H, found on a plate
taken Feb. 7.16 UT, was at B = 20 and located in an H II region
of the south arm of MCG +6-30-64 (R.A. = 13h36m.4, Decl. = +32 32',
equinox 1950.0); the SN is 3".5 east and 16".3 south of the
galaxy's center.  Further magnitude estimates:  Feb. 8.20, R =19.5;
9.15, R = 19.5; Mar. 11.09, B about [21.  A faint, less-stellar
object (probably an H II region) is visible at mag about 21 on POSS
B plate in the location of SN 1989H. SN 1989I, in an anonymous
galaxy, was found on plates taken Mar. 11.15 and 9.19 (B = 19)
by A. Maury and Pollas and was confirmed with the 2-m Pic du
Midi Observatory telescope on Apr. 2 by E. Davoust, A. Klotz, and
J. L. Nieto.  SN 1989I is located at R.A. = 14h34m15s.72, Decl. =
+14 53'09".1 (equinox 1950.0), and lies 3".4 west and 4".5 south
of the galaxy's center.                IAUC 4774

SU URSAE MAJORIS
A.  Udalski, York University, Toronto, and Warsaw University
Observatory, writes:  "Following notification by J. A. Mattei,
AAVSO, of the superoutburst of this dwarf nova (cf. IAUC 4773), I
obtained three 6-hr photometric observing runs of SU UMa using the
0.61-m/0.48-m twin photometric system of the David Dunlop Obsy
during Apr. 21-23.  Superhumps with an amplitude of about 0.2 mag
were discovered.  Based on timing of nine superhump maxima, the
preliminary superhump period is about 113.5 min.  The superhump
period is therefore about 3 percent longer than the orbital one
(Thorstensen et al. 1986, Ap.J. 309, 721), similar to that of
other SU UMa-type stars.  Discovery of superhumps in SU UMa
proves that the star is indeed a typical SU UMa-type dwarf nova
and a good prototype star for the whole class."
Further visual magnitude estimates by P. Schmeer,
Bischmisheim, W. Germany:  Apr. 23.89 UT, 11.7; 25.02, 11.7.
                                       IAUC 4774

Guy M Hurst