Central Bureau for Astronomical Telegrams
IAUC 5238: 1991S; DWARF N IN Oph; N Her 1991
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Circular No. 5238
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991S IN UGC 5691
M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
University of Chile, report the discovery by Roberto Antezana of a
supernova 5" east and 18" north of the nucleus of the galaxy UGC
5691 (MCG +04-25-025). The supernova (mag about 17-18) was found on
a 20-min IIa-O plate taken by L. Wells and Hamuy with the CTIO Curtis
Schmidt telescope on Apr. 10.093 UT. Coordinates measured for
the galaxy are R.A. = 10h26m43s.1, Decl. = +22 15'48" (equinox
1950.0). Confirmation was obtained on Apr. 13 by E. Cappellaro and
L. Pasquini at European Southern Observatory (V about 18) and by D.
Tucker (Yale University) with the 1-m Carnegie telescope at Las
Campanas Observatory.
DWARF NOVA IN OPHIUCHUS
F. M. Bateson, Variable Star Section, Royal Astronomical Society
of New Zealand, reported (via A. C. Gilmore, Mt. John University
Observatory) the discovery on Apr. 11.62 UT of a possible nova of
mag about 10 by P. Camilleri, Cobram, Victoria. A measurement by P.
M. Kilmartin of a 0.15-m astrograph film taken by Gilmore on Apr.
14.72 yields the following accurate position: R.A. = 17h17m14s.01,
Decl. = -26 43'28".8 (equinox 1950.0). M. Wagner, Ohio State
University and Lowell Observatory, reports that his examination of a
spectrogram obtained Apr. 14 UT by D. Hunter reveals strong and
broad H-alpha absorption characteristic of a dwarf nova at maximum;
there were two bright objects in the spectrograph's field-of-view,
this object being the brighter one. Available magnitude estimates,
visual unless otherwise noted: Mar. 23, [12 (Camilleri; photographic);
Apr. 12.55, 10.7: (D. A. J. Seargent, The Entrance, N.S.W.);
13.46 UT, 10.5 (A. Jones and D. Lester, Nelson, N.Z.); 13.55, 10.5
(P. Williams, Heathcote, N.S.W.); 13.56, 10.5 (Seargent); 15.46, 9.9
(Jones); 15.56, 11.0 (Seargent). Seargent notes that the object
does not exist on Atlas Stellarum.
NOVA HERCULIS 1991
Visual magnitude estimates (cf. IAUC 5229): Apr. 3.341 UT, 10.4
(J. E. Bortle, Stormville, NY); 6.06, 10.9 (P. Schmeer, Bischmisheim,
Germany); 8.32, 11.5 (A. Hale, Las Cruces, NM); 9.1, 12.0 (A. Mizser,
Budapest, Hungary); 11.14, 12.3 (S. Korth, Dusseldorf, Germany);
12.08, 12.2 (B. H. Granslo, Blindern, Norway); 13.42, 12.5 (Hale).
1991 April 15 (5238) Daniel W. E. Green
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