NGC 3746, Supernovae 2005ba

Supernova 2005ba in Barred Spiral Galaxy NGC 3746

Copeland's Septet, Hickson 57, Arp 320

Click here for a larger version of this image, and a negative version with the galaxies and supernova identified.

Supernova 2005ba in NGC 3746; Hickson Group 57
This is a 16:10:10:20 minute exposure with a STL-1301E CCD camera thru Kopernik's 20-inch Ritchey Chretien Cassegrain telescope taken on April 10, 2005 at 0:30 UT. The field of view is about 20x20 arc minutes, with North at the top.

Supernova 2005ba:

Discovered: April 1, 2005, by by Arne Danielsen, Mikkel Steine, and Ståle Kildahl of Norway; note that Arne has visited Kopernik and used the 20-inch for CCD imaging in the past.
Magnitude 17.5 at discovery.
Type: II
Magnitude in Kopernik image: Blue = 18.1; Red = 18.0

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

NGC 3746, Barred Spiral Galaxy (part of the Hickson 57 Group):

NGC 3746 is one member of the compact galaxy group Hickson 57. It's a Barred Spiral Galaxy with a nearly complete inner ring and tightly wound arms. This galaxy was also the host for Supernova 2002ar, a Type Ia that reached a maximum magnitude of 16.5. A rough distance estimate to NGC 3746 and SN 2005ba is 480 million light years.

Hickson 57 - Copeland's Septet - Arp 320, Compact Galaxy Group:

This is a compact group of eight galaxies that are interacting and possibly merging. This group in the Constellation of Leo was discovered in the 19th Century and is also named for its discoverer: Copeland's Septet. See our Hickson 57 page for more information on this group.

NGC 3746

Magnitude: 15.0

Constellation: Leo

RA: 11h 37m 43.6s

Dec: +22° 00' 34" Epoch 2000

Size (mins): 1.1' x 0.5'

Classification: SB(r)b

Barred Spiral Galaxy, inner ring

Dreyer description in the NGC:

"Pretty bright, pretty small, round."

Hickson 57

Copeland's Septet

Arp 320

Classification: Compact Galaxy Group

Eight Galaxies, including NGC 3646, NGC 3748, NGC 3750, NGC 3751, NGC 3753, NGC 3754, and PGC 36010). .

Hickson's description:

This is a large group of 8 galaxies..... Redshifts have been measured for 7 members, and are all found to be accordant. The small compact galaxy NGC 3754 interacting with the bright spiral NGC 3753 is a radio and infrared source.

Click below to

George Normandin, KAS

April 15th, 2005