Electronic Telegram No. 2851
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


PSN J10081059+5150570 IN UGC 5460
     T. Boles, Coddenham, England, reports the discovery of an apparent
supernova (mag 17.0) on an unfiltered CCD image taken on Sept. 29.182 UT using
a 0.35-m reflector, with the new object located at R.A. = 10h08m10s.58 +/-
0s.01, Decl. = +51o50'57".1 +/- 0".1 (equinox 2000.0), which is approximately
12".4 east and 17".2 north of the center of UGC 5460.  Additional magnitudes
for the variable (which was designated PSN J10081059+5150570 when it was
posted on the Central Bureau's TOCP webpage), provided by Boles:  1989 Dec. 6,
[20.5 (Digitized Sky Survey, red); 1992 Feb. 24, [21.0 (Digitized Sky Survey,
blue); 2011 Apr. 6, [19.5; 30, [19.5; Sept. 30.086, 16.9.

     A. Pastorello, Dipartimento di Astronomia, Universita di Padova and
Instituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova; V.
Stanishev, Centro Multidisciplinar de Astrofisica, Istituto Superior Tecnico,
Lisbon; and S. J. Smartt and M. Fraser, Queen's University, Belfast, on behalf
of a larger collaboration, report that a spectrogram (range 320-910 nm,
resolution 1.4 nm) of PSN J10091059+5150570, obtained by M. Lindborg on Sept.
30.22 UT with the Nordic Optical Telescope (+ ALFOSC), suggests that it is a
"supernova impostor" sharing some similarity with the eruption of the luminous
blue variable "UGC 2773-OT" (Smith et al. 2010, A.J. 139, 1451).  The spectrum
shows very narrow lines of H, Ca II (H and K and the near-infrared triplet,
with P-Cyg profile), and a forest of narrow Fe II absorption features.  Also,
prominent Na I D, Sc II, and Ba II features are clearly detected in absorption.
Note that, adopting for UGC 5460 a distance of 19.2 Mpc and a negligible
reddening, the absolute magnitude of the transient would be about -14.4.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 October 2                   (CBET 2851)              Daniel W. E. Green