NGC 2403
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A Hubble Space Telescope (HST) image of NGC 2403 |
|
| 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] |
| Notable features: | |
| Other designations | |
| HV.44,[citation needed] UGC 3918,[1] PGC 21396[1] | |
| See also: Galaxy, List of galaxies | |
NGC 2403 is an intermediate spiral galaxy in the Camelopardalis constellation. 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 |
[edit] Supernovae
As of late 2004, there had been two reported supernovae in the galaxy: SN 1954J and SN 2004dj.
[edit] 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 a thousand times further away at about 8 Mly.
[edit] See also
[edit] References
- ^ a b c d e f g h NASA/IPAC Extragalactic Database. Results for NGC 2403. Retrieved on November 21, 2006.
- ^ 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.
- ^ Ho, Luis C.; Alexei V. Filippenko & Wallace L. W. Sargent (October 1997), "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies", Astrophysical Journal Supplement 112: 315-390
