TA e-circular

<title>TA e-circular</title>
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THE ASTRONOMER Electronic Circular No 531      1991 June 16 10.56UT
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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COMET HELIN-ALU (1991r)
Eleanor Helin and Jeff Alu report their discovery of a comet on
films taken by Helin, K. Lawrence, P. Rose, and C. Brewer with the
0.46-m Schmidt telescope at Palomar.  The object is diffuse with no
apparent tail.
     1991 UT             R.A. (1950) Decl.        m1
     June 13.32257   16 35 54.60   -22 25 54.7    16
          14.32899   16 35 23.58   -22 18 26.4
IAUC 5292

COMET LEVY (1991q)
The following precise positions have been reported:
     1991 UT             R.A. (1950) Decl.        m1    Observer
     June 14.74375    1 43 56.57   +13 41 32.5    7.5   Koishikawa
          14.74826    1 43 57.82   +13 41 55.3            "
          15.82374    1 48 47.86   +14 30 15.0          McNaught
M. Koishikawa (Sendai Obs., Ayashi station). 300-mm telephoto lens.
R. H. McNaught (Siding Spring).  Communicated by A. C. Gilmore.

Total visual magnitude estimates:  June 15.43 UT, 9.6 (A. Hale,
Las Cruces, NM, 0.41-m reflector; 2'-3' coma); 15.44, 8.5 (C. S.
Morris, Pine Mountain Club, CA, 20x80 binoculars; 4'.4 coma).
IAUC 5292

SUPERNOVA 1991ag IN IC 4919
M. M. Phillips, Cerro Tololo Interamerican Observatory; and J.Maza,
University of Chile, report:  "Roberto Antezana (University of
Chile) has discovered a supernova located about 10" west and 33"
north of the nucleus of IC 4919 (ESO 185-G43; R.A. = 19h56m11s,
Decl. = -55 30'.7, equinox 1950.0).  The supernova (mpg about 15)
was found on a 20-min unfiltered IIa-O plate taken by M. Hamuy
(CTIO) with the CTIO Curtis Schmidt telescope on June 9.19 UT. The
ninth-magnitude star SAO 246378 is located 50" east of the galaxy
nucleus.  A CCD spectrum (range 325.0-750.0 nm) obtained on June
12.2 by Phillips with the CTIO 4.0-m telescope shows that this is a
type-Ia supernova about 1 week past blue maximum.  A spectrum of
the nucleus of IC 4919 obtained with the same telescope and
instrument yields a redshift of 0.0144."
IAUC 5287

SUPERNOVA 1991ah IN ANONYMOUS GALAXY
J. Maza, University of Chile; and M. M. Phillips, Cerro Tololo
Interamerican Observatory, report:  "Roberto Antezana (University
of Chile) has discovered a supernova located about 5" W and 6" N
of the nucleus of an anonymous galaxy at R.A. = 22h07m01s.7,
Decl. = -46 34'10" (equinox 1950.0).  The supernova (mpg about
18.5) was found on a 20-min unfiltered IIa-O plate taken by
M. Hamuy (CTIO) with the CTIO Curtis Schmidt telescope on June
9.379 UT. Confirmation was made by M. Navarrete (CTIO) from a CCD
image obtained on June 13.25 with the CTIO 0.9-m telescope. A CCD
spectrum (range 551.5-1020.0 nm) obtained on June 13.26 by Phillips
with the CTIO 4.0-m telescope shows that this is a type-II
supernova with strong and relatively narrow (1400 km/s FWHM)
H-alpha emission at a measured redshift of 0.037."
IAUC 5290

Guy M Hurst
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