THE ASTRONOMER Electronic Circular No 403 1990 April 18    18.46UT
Microlink:MAG60138              JANET:GUYH at UK.AC.SUSSEX.CLUSTER
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP, England. Telephone: (0256)471074 Int:+44256471074
Telex: 94082518 Answerback: TAGUY
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PROBABLE NOVA IN SCORPIUS
W. Liller, Vina del Mar, Chile, reports his discovery with
PROBLICOM of a probable nova at R.A. = 17h50m57s, Decl. = -30 48.3
(equinox 1950.0).  Magnitudes from 2415 film (+ red filter):  Apr.
9.25 UT, [12; 17.19, 10.2.  He adds that this may be a recurrence
of N Sco 1954 = NSV 09808 (IAUC 1471), though the position of that
object is poorly known (Duerbeck 1987, Space Sci. Rev. 45, 1).
IAUC 4995
Editor: NSV 09808 was discovered by P.Wild, Mount Palomar
Observatory on objective prism plates taken on 1954 August 30.
The position was estimated as:
RA 17h50m27s DEC -30 44'57"(1950)
and discovery magnitude as 13.8mpg
 
CI GEMINORUM
This nova-like variable (RA 06h26m54s DEC +22 21'(1950)) was
found by C.Hoffmeister with maximum recorded on 1940 Jan 3 at
14.7mpg. Further checks by Hoffmeister of 166 plates 1935 Nov 1
to 1944 Feb 24 failed to reveal further outbursts.
W.Wenzel, Sternwarte Sonneberg, reports analysis of Sonneberg
plates taken on 70 nights 1962.9-1966.7 and 1980.0 to 1989.2 in
a search for CI Gem. He finds further outbursts:
1963 Oct  5, 16.5 mpg (2 plates)
1966 Feb 23, 16.5 mpg
1986 Dec  3, 14.5 mpg
Duerbeck finds minimum light as B=18.5 on POSS.
Wenzel concludes that it may be an SU UMa-type dwarf nova with a
period of 100 days.
IBVS 3440
Observers are urged to monitor this system and photographs to
assist in chart development would be helpful.
 
Guy M Hurst