NGC 5054 and MCG -3-34-40
A pair of Spiral Galaxies
Supernova 2004 ab
This is a 10:5:5:5 minute LRGB exposure
with an ST-9E CCD camera thru Kopernik's 20-inch F/8.1 Ritchey Chretien
Cassegrain telescope taken at 3:50UT on May 19, 2004. The field of view
is about 9x9 arc minutes with North at the top.
Supernova 2004 ab:
- Discovered: February 21, 2004, by
- Magnitude: 14.7 at discovery and
18.0 in the Kopernik image.
- Type: Ia
- The supernova expansion velocity
is 10,400 km/s.
Spiral Galaxy NGC 5054 is an outlying
member of the NGC 5044 Galaxy Group. However, the redshift is different
enough from the group red shift to suggest a foreground location. There
are three main arms. The two high-surface-brightness arms are studded with
H-II regions. Note the faint surface brightness of the spiral pattern at
the outer extensions of the main arms. This galaxy has a small, very bright,
complex nucleus with a possible ring structure.
Galaxy MCG -03-34-040 is located
about 3 arc minutes to the north. It appears to be a spiral galaxy that
is possibly interacting with NGC 50540, but it may also be a distant background
galaxy. There is no certain evidence of interaction and astronomers have
not determined this galaxy's red shift.
Using the red shift data from the
“NASA Extra-galactic Data Base(NED)”,
(and a Hubble Constant of 62 Km per sec., per Megaparsec),
one can calculate a rough distance for NGC 5054 and Supernova 2004ab of
92 million light years. At that distance the galaxy diameter would be 136,900
- NGC 5054
- Constellation: Virgo
13h 16m 58.4s
- Dec: -16° 38' 07" Epoch
- Size (mins): 5.1' x 3.0'
Galaxy, S-shaped, Luminosity Class I-II
Deep Sky Field Guide:
very bright nucleus, three main bright arms."
- MCG -3-34-40
- Magnitude: 16.0
13h 17m 04.2s
- Dec: -16° 35' 48" Epoch
- Size (mins): 0.8' x 0.2'
Classification: Spiral ?
Possibly interacting with NGC 5054, but it may also be a distant background
George Normandin, KAS
May 31st, 2004