THE ASTRONOMER Electronic Circular No 648 1992 June 28 16.55UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074
Telex: 9312111261 Answerback: TA G JANET BOXES:
GMH at UK.AC.CAM.ASTRONOMY.STARLINK or GUYH at UK.AC.SUSSEX.CLUSTER
TELECOM GOLD: 10074:MIK2885 PRESTEL 256471074
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RS OPHIUCHI
Savvas Koushiappas, Nicosia, Cyprus has reported that this
recurrent nova is brightening, having reached magnitude 10.6 on
1992 June 21.861UT. This may not represent a major outburst but
part of one of the active phases of this star. To assist us in
investigating this behaviour could observers with any results for
1992 Jan 1 onwards please send date, time, full estimate,
magnitude, class, instrument and sequence used.
SUPERNOVA 1992ac IN MCG +10-24-007
G.Gomez, Instituto de Astrofisica de Canarias reports that whilst
obtaining a spectrum of SN 1992R, another supernova was located 4"
north on May 30. This has been designated SN 1992ac.
IAUC 5543 (Edited)
PERIODIC COMET ASHBROOK-JACKSON (1992j)
A. C. Gilmore and P. M. Kilmartin report their recovery of this
comet, as shown below. Their observations appear to confirm a
single-night detection reported more than a year ago. The position
is in close agreement with the prediction on MPC 16380 (ephemeris
on MPC 19528).
1991 UT R.A. (2000) Decl. m2 Observer
Apr. 24.04583 13 29 48.97 -16 54 55.4 21.5 Lindgren
24.09306 13 29 46.96 -16 54 51.6 "
1992 UT
May 4.57861 16 52 49.47 -37 46 22.4 18.9 Gilmore
4.61808 16 52 47.97 -37 46 29.9 "
29.56949 16 32 33.26 -38 29 49.9 17.5 "
29.60352 16 32 31.30 -38 29 49.8 "
M. Lindgren and G. Tancredi (La Palma). 2.5-m Nordic telescope.
Not obviously cometary.
A. C. Gilmore and P. M. Kilmartin (Mt. John). 0.6-m reflector.
Weak, stellar images on May 4, more convincing images on May 29.
IAUC 5546
V CORONAE AUSTRINAE
This R CrB-type variable star has shown a slow decline in recent
months, as indicated by the following visual magnitude estimates by
P. F. Williams, Heathcote, N.S.W. (communicated by R. H.McNaught,
Anglo-Australian Observatory): Mar. 3.74 UT, 9.9; 10.67, 10.1;
26.78, 10.3; Apr. 4.79, 10.5; 30.66, 10.7; May 4.57, 10.7; 13.52,
10.8; 24.48, 11.3; 27.51, 11.4; 31.52, 11.4; June 3.51, 11.3.
IAUC 5549
NOVA SCORPII 1992
Paul Camilleri, Australia, informs us that Terry Lovejoy of
Rosanna, Victoria has found a pre-discovery photograph showing
the nova which was taken on 1992 May 10.5UT using a 127mm f4.7
lens stopped to f/7 on T-Max 400 (5x4"format), 2 min exposure.
The trailed image of the nova is of about mpv=10.
Paul also provides further personal estimates (cf E646):
1992 June 19.359, 8.9; 24.365, 8.2; 25.534, 8.2; 27.402, 7.9;
28.536, 7.4.
The nova is evidently rising to a second maximum.
Guy M Hurst