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THE ASTRONOMER Electronic Circular No 2871      2012 Nov 25 20.34UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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COMET P/2012 US_27 (SIDING SPRING)
An apparently asteroidal object discovery by Rob McNaught on CCD
images taken with the 0.5-m Uppsala Schmidt telescope at Siding
Spring on 2012 Oct. 17 initially given the minor-planet designation
2012 US_27 has now been found by McNaught to have brightened
noticeably and to show cometary appearance; his images taken with
the same telescope on Nov. 21.5 UT show V magnitude 17.5-17.7 and a
vague suggestion of a 10" tail in p.a. 70 deg. His follow-up images
on Nov. 22.5 show again a vague suggestion of a tail to the east,
and he again notices the suggestion of a 10" tail in p.a. 70 deg on
image taken on Nov. 25.5:

     2012 UT             R.A. (2000) Decl.       Mag.   Observer
     Oct. 17.58428    0 48 42.67   -47 27 08.5   19.1   McNaught
          17.76557    0 48 23.77   -47 24 13.9            "

The available astrometry, the following elliptical orbital elements
by Gareth Williams, and an ephemeris appear on MPEC 2012-W47.

     T = 2013 Feb.  8.5770 TT         Peri. =   1.2790
     e = 0.648233                     Node  =  49.2127  2000.0
     q = 1.820649 AU                  Incl. =  39.2887
       a =  5.175727 AU    n = 0.0837042    P =  11.8 years

SUPERNOVA 2012go IN PGC 214858
Further to TA E-Circular 2868, reporting the discovery of a
supernova in PGC 214858 by Ron Arbour of South Wonston, England,
David Grennan of Dublin, Ireland also imaged it on Nov 17.85UT with
a 0.36-m reflector + SBIG ST8 camera at magnitude 16.5. The
limiting magnitude was 20.1 and the position end figures 51s.79,
06".7.

E. Kankare et. al., University of Turku, report that a spectrum of
the object, now designated SN 2012go was obtained on Nov. 19.0UT
with the Nordic Optical Telescope (+ ALFOSC; range 320-910 nm,
resolution 1.6 nm).  Cross-correlation with a library of supernova
spectra using the "GELATO" code and "Supernova Identification" code
suggests that it is a normal type-Ia supernova at a redshift of
about 0.03.  The best matches were found with the spectra of SN
2002bo at a few days before maximum light.

R. Kotak et. al., Queen's University, Belfast, report that a
spectrum obtained on Nov. 20.81 UT with the 2-m William Herschel
Telescope shows it is a young type-Ia supernova at phase of between
-7 and -3 days from maximum light, and with a redshift of z = 0.03.
The redshift measured from 2012go is in agreement with that
measured from narrow emission lines from the host galaxy.

Congratulations to Ron on the discovery of his 28th supernova.

Guy M Hurst