Peculiar Galaxy NGC 523 - Arp 158

Supernova 2001 en

Galaxy NGC 523 and Supernova 2001 en
Image taken with an ST-9E CCD camera thru Kopernik's 20 inch F/8.1 telescope at 0:35 UT on October 19, 2001. The field of view is 8x8 arc minutes with South at the top.

Supernova 2001 en:

Discovered September 26th, 2001, by LOTOSS, and independently by the supernova group at Beijing Astronomical Observatory.

Follow this Link to a NASA Web site on supernovas. It has a very nice animation and a description of what these objects are.

Galaxy NGC 523 (aka Arp 128):

NGC 523 in Andromeda is classified as a Peculiar galaxy. It has three compact knots connected by a bright bar, with fan-shaped jets. One broad extension is extremely dim. Since all three 'knots' have a red shift that is the same as the galaxy it is doubtful that they are foreground stars. This odd object is most likely a colliding group of two or three strongly interacting galaxies. H. Arp included it as Arp 158 in his catalog of peculiar galaxies in the class `disturbed with interior absorption'.

Based on the published red shift, (and a Hubble Constant of 62 Km/sec per Mpc) a rough distance estimate for NGC 523 and supernova 2001 en is 250 million light years, with a diameter of about 182,000 light years.

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George Normandin, KAS

October 23rd, 2001