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THE ASTRONOMER Electronic Circular No 2338      2007 May 22 19.41UT
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
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(1830) POGSON
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak,
Ondrejov Observatory; J. Oey, Leura, N.S.W., Australia; and D. Pray, 
Carbuncle Hill Observatory, Greene, RI, report on CBET 957 that 
photometric observations obtained during Apr. 18 to May 9 reveal that 
minor planet (1830)is a binary system with an orbital period of 24.240 
+/- 0.005 hr. The primary shows a period of 2.5702 +/- 0.0001 hr, and it 
has a lightcurve amplitude of 0.12 mag.

SUPERNOVAE 2007bo-2007bz
The "Nearby Supernova Factory" collaboration reports the discovery on 
CBET 941 of twelve new supernovae in images obtained during Mar. 26-Apr. 
22 UT with the QUEST-II camera on the Palomar Oschin 1.2-m Schmidt 
telescope:
SN      2007 UT       R.A. (2000.0) Decl.      Mag.    z     Type
2007bo  Mar. 26.2   10 44 28.93  +23 50 10.7   19.6   0.04    II
2007bp  Mar. 26.4    9 24 00.55  + 5 12 25.0   15.6   0.03    II
2007bq  Apr.  3.5   15 47 04.71  - 6 43 38.1   18.8   0.03    II
2007br  Apr.  4.3   11 15 39.93  - 4 22 47.8   19.5   0.05    Ib
2007bs  Apr.  8.5    8 06 46.58  +22 24 46.0   19.8   0.14    IIn
2007bt  Apr. 17.5   14 27 47.73  +12 48 47.1   15.6   0.04    IIn
2007bu  Apr. 18.2   11 47 23.91  + 6 38 46.8   19.3   0.03    II
2007bv  Apr. 18.4   15 34 10.87  + 7 05 48.7   19.6   0.05    II
2007bw  Apr. 18.5   17 11 01.99  +24 30 36.4   17.3   0.14    IIn
2007bx  Apr. 19.3   11 02 41.52  - 1 38 31.5   18.6   0.02    II
2007by  Apr. 22.4   15 44 44.08  + 4 28 13.1   19.1   0.04    II
2007bz  Apr. 22.4   12 56 53.77  +22 22 22.1   16.7    ?      ?

SUPERNOVA 2007bm IN NGC 3672
Further to the discovery note on TA E-Circular 2337 when supernova 
2007bm was given as magnitude 16.0, type-Ia and found before maximum, 
Guy Hurst reports that images obtained with the Bradford Robotic 
Telescope on 2007 May 12 (00h17mUT) and May 13 (22h35mUT) show the 
object has brightened to magnitude 14.2 (60 sec exposures with green 
filter).

S/2007 S 1, S/2007 S 2, AND S/2007 S 3
S. S. Sheppard, D. C. Jewitt, and J. Kleyna have reported on IAUC 8836 
the discovery of three new satellites of Saturn in data
obtained earlier this year with the Subaru 8.2-m reflector at Mauna Kea, 
aided by Brian Marsden's ongoing linkages and search ephemerides. 
Astrometry show orbital periods of 895, 793, and 992 days for S/2007 S 
1, S/2007 S 2, and S/2007 S 3, respectively; the latter two objects have 
retrograde orbits.

Guy M Hurst