THE ASTRONOMER Electronic Circular No 572   1991 October 21 15.56UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP, England. Telephone:  (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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LD 22
Mike Collins, Sandy, reports that he has discovered a variable star
in Cygnus on photographs taken for the UK Nova/Supernova Patrol on
1991 October 3.9UT. The star is located at:
RA 20h 18m 58s DEC +49 33' (1950)
and was estimated at 10.2.
The object has been identified as LD 22, the 22nd star in a series
announced by Lennart Dahlmark of Sweden on IBVS 2157 (1982). It is
listed there as having a range of 12.2-[15.0v and B-V in excess of
2 magnitudes which probably explains the much brighter estimate by
Mike Collins being based on Kodak 2415 film.
The editor estimates the following magnitudes from atlases:
Lick          1954 Sept  3 [15 B(Not recorded)
Stellarum     1969 July 14  14:B
Papadopoulos  1976 July 26  12.4pv
Mike Collins notes that the star is not catalogued in the GSC or
the IRAS PSC.
The e-mail chart below adopts the new format detailed on E567.
\\\\\\ LD22(c) preliminary
S,90,10,S
P,20h 18m 58s +49 33' (1950)
O,44,46,10.2,?
-S,TA 911020
R,10.2,56,49,A,B
R,11.6,30,36,B,B
R,12.3,63,51,C,B
R,12.7,62,25,D,B
R,13.3,44,23,E,B
M,9,80,52
M,12,40,83,13,65,53,83,86,87,67,8
M,12,77,53,64,89,58,88
M,13,67,74,86,47,38,25,14,57,45,78,
M,13,68,58,6,84,35,48,83,51,28,37,66,44,9,61
M,13,67,39,6,84,42,75
M,13,34,31
M,14,66,56,66,4,3,32,11,60,38,64,39,47
E,37
////// Basic chart automatically generated by GSC2FIND ver 1.0

SUPERNOVA 1991bb IN UGC 2892
J. Mueller reports her discovery of a supernova (mag about 18) in
UGC 2892 (R.A. = 3h50m.7, Decl. = +18 57', equinox 1950.0), found
on a red plate taken by J. D. Mendenhall and Mueller on Oct. 13
with the 1.2-m Oschin Telescope in the course of the second Palomar
Sky Survey. SN 1991bb is located 9".4 east and 2" north of the
galaxy nucleus. A. V. Filippenko and T. Matheson, University of
California at Berkeley, report that broadband CCD images of
UGC 2892 obtained on Oct. 14 UT with the Nickel 1-m reflector at
Lick Observatory confirm the presence of the candidate.  The object
appears bluer than the nearby galactic nucleus, and it may be
brighter than reported by Mueller. At their request, R. Cohen,
R. Lyons, and E. M. Burbidge (University of California at San
Diego) obtained a CCD spectrum (range 310-870 nm, resolution 1 nm)
with the Shane 3-m reflector at Lick. Preliminary inspection of the
uncalibrated spectrum shows that the object is indeed a supernova,
probably of type Ia; a reasonably deep absorption trough near
620 nm is present.
IAUC 5365

Guy M Hurst