Lenticular Galaxy UGC 00646 and Supernova 1998ef

Supernova 1998ef in UGC 646

CCD Image taken on October 24th, 1998, UT 5:06, using an SBIG ST-6 thru Kopernik's 20 inch F/8.1 telescope. The field of view is about 5x7 arc minutes; exposure = 10 minutes.

Lenticular galaxy UGC 00646 is a very dim and distant galaxy that is too faint to appear in the Uranometria 2000 star atlas. However, note that there are several even fainter anonymous galaxies in our CCD image.

Based on the published red shift, a rough distance estimate for UGC 00646 and supernova 1998ef is: 280,000,000 light years, with the galaxy being 98,000 light years in diameter. Considering that the other stars in the image are no more than a few thousand light years at the most, it is possible to see the tremendous amount of energy released by this event.

The following is the data on SN 1998ef:

Discovered: October 18th, 1998, by Lick Observatory Supernova Search

From IAU Bulletin 7032 (10/19/98):

....confirmed on an earlier image taken on Oct. 14th (mag about 16.7)...... image of the same field on Oct. 10th showed nothing.... a CCD spectrum of SN 1998ef obtained on Oct. 19 by C. De Breuck (Lawrence Livermore National Laboratory) with the 3-meter Shane reflector at Lick reveals that the object is a type-Ia supernova.

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George Normandin, KAS

October 24th, 1998