Spiral Galaxy NGC 2403

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NGC 2403

A Hubble Space Telescope (HST) image of NGC 2403
Credit: HST/NASA/ESA.
Observation data (J2000 epoch)
Constellation Camelopardalis
Right ascension 07h 36m 51.4s[1]
Declination +65° 36′ 09″[1]
Redshift 131 ± 3 km/s[1]
Distance 8 Mly (2.5 Mpc)[2]
Type SAB(s)cd[1]
Apparent dimensions (V) 21′.9 × 12′.3[1]
Apparent magnitude (V) 8.9[1]
Other designations
HV.44,[citation needed] UGC 3918,[1] PGC 21396[1], Caldwell 7
See also: Galaxy, List of galaxies

NGC 2403 is an intermediate spiral galaxy in the constellation Camelopardalis. It has a H II nucleus.[3] It was discovered by William Herschel in 1788. NGC 2403 is an outlying member of the M81 Group,[2] and is approximately 8 million light-years distant. The northern spiral arm connects to NGC 2404.[2] It may be easily seen using 10 × 50 binoculars.[2]

Contents

Supernovae

As of late 2004, there had been two reported supernovae in the galaxy: SN 1954J and SN 2004dj.

History

Allan Sandage detected Cepheid variables in NGC 2403 using the Hale telescope, making it the first galaxy beyond our local group to have Cepheids found in it.[2] He derived a distance of a mere 8 kly.[2] Today, it is thought to be a thousand times further away at about 8 Mly.

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See also

References

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 2403. Retrieved on 2006-11-21.
  2. ^ a b c d e f Kepple, George Robert; Glen W. Sanner (1998). The Night Sky Observer's Guide, Volume 1. Willmann-Bell, Inc., 73. ISBN 0-943396-58-1. 
  3. ^ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997), "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies", Astrophysical Journal Supplement 112: 315-390 

External links

Retrieved from "http://en.wikipedia.org/wiki/NGC_2403"

This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.