Spiral Galaxies NGC 799 and NGC 800
Supernova 2004dt

Supernova 2004dt:

• Discovered: Aug 11, 2004, by the LOTOSS supernova group's Katzman Automatic Imaging Telescope (KAIT).
• Magnitude 16.1 at discovery.
• Type Ia
• The supernova measured magnitude 17.7 in the Kopernik image above taken at 4:00 UT on Sept 19, 2004..

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 799 and NGC 800 are a close pair of Spiral Galaxies in the Constellation of Cetus. They have nearly identical red shifts and therefore they are probably very close to each other. NGC 799 has a small bright nucleus and a short bar that appears to be the location of Supernova 2004dt. There are two very dim and broad spiral arms that start at the ends of the bar and wrap nearly completely around this galaxy forming a pseudo outer ring. NGC 800 has a bright nucleus and three bright knotty arms.

The Sloan Digital Sky Survey has tentatively identified the 20th magnitude star-like object labeled 'QSO' in our image as a very distant Quasar: SDSS J020202.64-001009.2. They conclude that this object has a red shift of roughly 2.89. After adjusting for the effects of Relativity, this implies that this Quasar is receding from us that the astounding speed of 88% of the speed of light, and a distance of 14 billion light years.

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 estimate for NGC 799, NGC 800, and SN 2004dt, of about 311 million light years. This would mean that NGC 799 has a diameter of about 181,000 light years.

NGC 799 Magnitude: 14.1 Constellation: Cetus RA: 02h 02m 12.2s Dec: -00° 06' 03" Epoch 2000 Size (mins): 2.0' x 1.7' Classification: (R')SB(s)a:        Pseudo Outer Ring, Barred Spiral Galaxy, S-shaped {uncertain} Dreyer description in the NGC:        "Most extremely faint, pretty small, round, north of 2."

NGC 800 Magnitude: 14.1 Constellation: Cetus RA: 02h 02m 11.8s Dec: -00° 07' 53" Epoch 2000 Size (mins): 1.0' x 0.8' Classification: : SA(rs)c:        Spiral Galaxy, Mixed Inner Ring / S-shaped {uncertain} Dreyer description in the NGC:        "Most extremely faint, small, round, south of 2."

Click below to

George Normandin, KAS

September 22nd, 2004