-------------------------------------------------------------------
THE ASTRONOMER Electronic Circular No 2750      2011 Jly 17 11.41UT
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
-------------------------------------------------------------------
FEBRUARY ETA DRACONIDS AND UNDISCOVERED LONG PERIOD COMET
P. Jenniskens, SETI Institute, reports on CBET 2763 the detection of a 
meteor outburst from a previously unknown shower on 2011 February 4 
during routine low-light-level video triangulations with NASA's Cameras 
for Allsky Meteor Surveillance (CAMS) project in California between 
2h20m and 14h20m UT.
During that time interval, six meteors radiated from a compact 
geocentric radiant at RA 239.92, DEC +62.49. The times of arrival for 
the meteors were 6h25m, 7h59m, 10h49m, 11h18m, 12h14m, and 13h33mUT, 
suggesting that the outburst peaked around 11h UT and had a duration of 
at least 7 hours.  The shower was not detected on the days prior to or 
after Feb. 4.  The meteors were in a narrow magnitude range, with peak 
visual magnitudes of 2.1, 1.9, 2.6, 2.1, 2.3, and 2.4. The orbital 
period of this shower is P > 52 y, so that the meteoroids are likely the 
dust trail of an earth-threatening long-period comet that remains to be 
discovered.  Based on the measured orbit, Esko Lyytinen (Helsinki) 
calculated a possible return of the shower in 2016 or 2023, with the 
next return not until 2076.

SUPERNOVA 2011cd IN MCG -02-52-11 = PSN J20321290-0843470 (CHASE)
2011cd  Apr 14.94   20 32 12.96  -08 43 47.1  17.7   2.7"E,  14.3"N
M. Stritzinger et al: spectrum Apr. 28UT type-II supernova at late 
phases.

SUPERNOVA 2011ce IN NGC 6708 = PSN J18553580-5343290 (CHASE)
2011ce  Apr 19.40   18 55 35.84  -53 43 29.1  15.8   2.2"E,   4.7"S
J. Anderson et. al., Las Campanas Observatory: spectrum Apr. 23 gives 
best matches with the peculiar type-Ia supernovae 2002cx and 2005hk at 
around 20 days past maximum.

SUPERNOVA 2011cf IN NGC 2939 = PSN J09380828+0931111 (LOSS)
2011cf  Apr 28.24   09 38 08.28  +09 31 11.1  18.2   5.9"E,  14.8"S
J. M. Silverman et. al., spectrum May 5 indicates highly reddened 
type-II supernova.

SUPERNOVA 2011cg (CATALINA)
2011cg  Apr 14.33   14 59 09.25  +07 18 04.2  15.7   2  "W,   1  "S
G. H. Marion, Harvard-Smithsonian Center for Astrophysics: spectrum May 
5UT shows type-Ia supernova about two weeks after maximum

SUPERNOVA 2011ch (CATALINA)
2011ch  Apr 27.21   13 02 54.31  +49 52 29.1  16.1   1  "E
G. H. Marion: spectrum May 5UT type-Ia supernova at three to four weeks 
after maximum light.

SUPERNOVA 2011ci = PSN J10180041-0232414 (CATALINA)
2011ci  May  4.16   10 18 00.41  -02 32 41.4  17.6            1  "N
G. H. Marion: spectrum May 5UT type-Ia supernova a few days before 
maximum light.

SUPERNOVA 2011cj IN UGC 9356 = PSN J14325381+1135493 (LOSS)
2011cj  May  9.39   14 32 53.81  +11 35 49.3  17.0   4.4"E,   7.5"N
G. H. Marion: spectrum May 12UT type-IIP supernova near maximum

Guy M Hurst