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THE ASTRONOMER Electronic Circular No 2345      2007 Jun 13 17.44UT
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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SUPERNOVA 2007co And SUPERNOVA 2007ck IN MCG +05-43-16
Joel Nicolas, France, reports on CBET 977 his discovery of an apparent 
supernova of mag 16.6 on a CCD images obtained on June 4.978 and 6.935 
UT with a 0.36-m Schmidt-Cassegrain telescope, noting that the object is 
not present on the Palomar Sky Survey. Nicolas gives the position of the 
new object as:
RA 18h 23m 03.6s DEC +29 53' 49.6" (2000) 8" E and 15" S of the nucleus 
of MCG +05-43-16.

Supernova 2007ck, found by Tom Boles (see TA E-Circular 2339) also 
occurred in this galaxy and was discovered as recently as 2007 May 19.

T. Orff reports that a six co-added 30-s unfiltered CCD images (limiting 
mag 19.5) taken in Portal, AZ, with a 0.4-m Schmidt-Cassegrain telescope 
on June 6.245 shows this new object at mag 16.4 located at position end 
figures 03.60", 49.7", the offset given as 8.1" W and 14.9" S of the 
galaxy's centre. Orff adds that 2007ck appears at mag 17.5 on this same 
image, and that nothing is visible at the location of 2007co on Palomar 
Sky Survey images from 1989 and 1990. Weidong Li also reports imaging 
both objects on June 7.343UT.

V2615 OPHIUCHI
Rudy, Lynch, Mazuk, Russell, Pearson, Woodward, Puetter, and Perry,
report on IAUC 8846, 0.4- to 2.5-micron spectroscopy of V2615 Oph 
obtained at Lick using the Lick 3-m telescope (+ VNIRIS) on May 7 UT, 
and 0.8- to 5.5-micron spectroscopy, obtained at the IRTF as above on 
May 31.

This nova evolved dramatically between the two observations due to the 
formation of dust. The reddening derived from the O I lines jumped from 
E(B-V) = 1.0 to 1.3. The emission-line spectrum remained very rich and 
of low excitation with numerous features of Fe II and N I.  The infrared 
Ca II triplet was present, and the C I lines were unusually strong, even 
for a nova.  The carbon-monoxide emission reported by Das et al. on CBET 
925 was no longer present.

Editor: This object, despite its unusual nature, has been seriously 
under-observed by amateur astronomers.

Guy M Hurst