SUPER NOVAE SEPTEMBER 2004
SEPT 1 - 30TH now complete.

So far this month there have been seven super-nova discoveries, three of these were of type-II, one was type 1a and the remaining four remain unknown. The brightest of these novae, 2004eo, is presently of magnitude 15.8. A type-II super nova originates as a binary system where one component’s atmosphere is streaming into its companion before exploding as a nova. A type-I nova is that of a single main sequence star exploding. A large telescope is needed to observe these nova, bearing in mind that a 12 inch reflector has a limiting magnitude of +15.

1. A type-II Nova 2004ek was discovered on Sept 9, 2004 by Tom Boles; Tim Puckett and L. Cox in UGC 724 (Pisces) at R.A. = 01h09m58s.51, Decl. = +32°22'47". 7 at Mag 17.1

2. A type-II Nova 2004ej was discovered on Sept 10, 2004 by Berto Monard in NGC 3095 (Constellation Antlia) at R.A. = 10h00m02s.84, Decl. = -31°33'25". 5. At Mag 16.3. It then brightened to Mag 15.9 on the 12th before falling to Mag 16.3 by September 15.

3. A type-II Nova 2004el, was discovered on Sept 14 by Ron Arbour in MCG +09-25-004 (Constellation Böötes) at R.A. = 14h59m51s.79, Decl. = +54°37'06". 1 at Mag 16.8 Located 9". 9 west and 2". 7 south of the nucleus.
4. A type-II Nova 2004el, was discovered Sept 14 by Ron Arbour in MCG +09-25-004 at R.A. = 14h59m51s.79, Decl. = +54°37'06". 1 Mag 16.8 Located 9". 9 west and 2". 7 south of the nucleus.

5. Type unknown Nova 2004em, was discovered on Sept 14 by Mark Armstrong in IC 1303 at R.A. = 19h31m31s.11, Decl. = +35°52'15". 7 at Mag 18.2 Located 10". 4 east and 20". 3 south of the nucleus. The nova’s magnitude remained unchanged on Sept 19.

6. A type 1a Nova 2004eo, was discovered Sept 20 by Koichi Itagaki in NGC 6928 (Delphinus) at R.A. = 20h32m54s.19, Decl. = +09°55'42". 7 at Mag 17.8 Located 59". 1 east and 6". 5 north of the nucleus. Its magnitude continues to brighten; on Sept 23 it has increased to 15.8.

7. Type unknown 2004ep, was discovered on Sept 22 by Lick Observatory Supernova Search in IC 2152 (Constellation Lepus) at R.A. = 05h57m53s.66, Decl. = -23°10'58". 3 Mag 18.6 Located 3". 8 east and 7. 2” south of the nucleus.

Updated Oct 1,2004

There have been a further 3 supernova discovered this month bringing the total to 10.

The Lick Observatory Search team struck lucky twice on the same night on Saturday September 25. According to the International Astronomical Union circulars the times of both discoveries almost coincides.

Unknown-type nova 2004er, was discovered on September 25 by the Lick Observatory Supernova Search in galaxy MCG-01-7-24 in the constellation of Cetus at RA. 02h36m59s.04, Dec -05°21'19". 7 located 7". 3 east and 22". 2 south of the nucleus. Its discovery magnitude of +16.8 had faded to Mag +17 on the night of September 28. The galaxy itself lays a few degrees below the popular variable star Mira with the constellations rising in the east late in the evening.

Then looking low in the northern sky at the constellation of Lynx they discovered Nova 2004es in galaxy UGC 3825 at R.A. 07h23m34s.62, Decl. +41°25'38". 3 located 15". 9 east and 27". 0 south of the nucleus. Its magnitude is presently +17.5 and beginning to fade. Supernova 1998C was also located in this galaxy.

Type-II Super nova 2004et was discovered by Stefano Moretti on September 27 in galaxy NGC 6946 which is in the northern constellation of Cepheus at R.A. 20h35m25s.4, Dec +60°07'17". 6 located 247". 1 east and 115". 4 south of the nucleus. This is the brightest Nova discovered this month at Magnitude +12.6. Its brightness remains about the same according to the latest observations: Sept 28 Mag +12.60. Sept 29 Mag +12.50. Sept 30 Mag +12.63. William Herschel discovered NGC 6946 206 years ago on September 9, 1798. The galaxy’s visual magnitude is +9 and it has an apparent dimension of 11’ x 10’ of arc and lies at a distance 10,000 (Light-years). Seven supernovae have been detected in NGC 6946, the last being SN 2002hh of type II discovered by the LOTOSS project and reached Mag +16.5 at its maximum.

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Richard Pearson
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Thanks Richard,

This is a cool list. Can you post a similar list on around the first of each month? If there is some other unified source that you get this from, perhaps it would be simple enough just to point to the source.

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Forming opinions as we speak

http://www.rochesterastronomy.org/snimages/ is a good site for recent supernova data.

Dave Mitsky

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