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THE ASTRONOMER Electronic Circular No 2954      2013 Oct 10 12.12UT
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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JUPITER: TRIPLE SHADOW EVENT, 2013 OCTOBER 12
Following the announcement in BAA Bulletin 00762 by John Rogers, Director of
the BAA Jupiter Section, of a fascinating series of double and triple
phenomena of Jupiter's moons occurring throughout October, Martin Mobberley
has sent comments to TA.

Martin has produced a graphic of this Saturday's (2013 October 12) Jupiter
triple shadow event, mainly as reminder of what is supposed to happen.
Clearly the event is very well placed from the UK, even though in increasing
dawn twilight. The graphic can be found at:
http://martinmobberley.co.uk/images/OCT2013_TRIPLE_SHADOW_EVENT_mpm.jpg

He recalls that Horace Dall's famous picture of 1956 April 21 is the best
known BAA picture of such an event, but Jean Meeus lists seven other triple
shadow events between 1956 & 2013 and roughly 15 to 17 seem to occur per
century....sometimes with two in the same year. There are other such events
on 2014 June 3 and also on 2015 Jan 24, but clearly Saturday's event is
especially favourable for UK observers.

The graphic shows two discs....one for 04:40 UT and one for 05:30 UT and the
GRS longitude is displayed correctly, so it will be on the disc during the
event.

SUPERNOVA 2013fb IN IC 221 (MASAKI TSUBOI)
2013fb  Aug 27.68   02 22 42.07  +28 16 01.2  16.0  15.6"E   35.9"N
The discovery image has been posted at the following website URL:
http://tenku.dee.cc/PSN/IC221130828-01.jpg
K. Ayani: spectrum Aug 28 with the BAO 1.01-m telescope suggests a type-Ia
supernova around maximum. The absorption minimum of the Si II 635.5-nm
feature is blueshifted by about 14000 km/s, assuming the recession velocity
of IC 221 to be 5090 km/s.

Guy Hurst reports V-photometry using the Bradford Robotic Telescope:
2013 Sept 22.17UT, 16.12V; 26.18UT, 16.01V (+/-0.02)
Sequence: TA 130922

SUPERNOVA 2013fc IN ESO 154-10 (CHASE PROJECT)
2013fc  Aug 20.21   02 45 08.96  -55 44 27.3  15.4   1.9"E    0.5"S 
C. Inserra: spectrum Aug 29 shows a type-IIn supernova similar to SN 2006gy
before maximum light.

Guy M Hurst