Spiral Galaxy NGC 3169 - Supernova 2003 cg

Spiral Galaxy NGC 3169 and Supernova 2003 cg
CCD image taken with an ST-9E CCD camera thru Kopernik's 20 inch F/8.1 telescope at 2:05 UT on May 5th, 2003. This was a 10 minute exposure. The field of view is 8x8 arc minutes with North at the top.


Supernova 2003 cg:

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


Spiral Galaxy NGC 3169:

NGC 3169 is a peculiar spiral galaxy in the constellation of Sextans. It has a small bright nucleus and multiple dust lanes that appear in silhouette against the large central bulge. The spiral arm pattern is of the filamentary type. H-II regions are evident, particularly in the bright arm on the near side. Very faint outer arms exist of such low surface brightness that they are only hinted at in the Kopernik image. NGC 3169 forms a pair with NGC 3166 at 7.7 arc minutes angular distance. There exist signs of interaction (warps; Sandage & Bedke 1994). Galaxy NGC 3165 is another close companion.

Quote from The Deep Sky Field Guide to Uranometria 2000:

"Small, very bright nucleus in bright bulge; with dark lane on one side."

Based on the published red shift, (and a Hubble Constant of 62 Km/sec per Mpc) a rough distance estimate for NGC 3169 and supernova 2003 cg is 65 million light years. At that distance NGC 3169 would have a diameter of 83,350 light years.



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George Normandin, KAS

May 7th, 2003