File:NGC_45_DECam.jpg · Wikimedia Commons · See Wikimedia Commons
Q49671
Sign in to saveAlso known as UGC 4, New General Catalogue 45
spiral galaxy in the constellation Cetus
Key facts
- Constellation
- Cetus
- Right ascension
- 00 14 03.989
- Declination
- –23 ° 10 ′ 55.53 ″
- Heliocentric radial velocity
- 466 km/s
- Distance
- 21.7 Mly (6.64 Mpc )
- Apparent magnitude v
- 10.73 ± 0.03
- Apparent magnitude b
- 11.21 ± 0.03
- Type
- SA(s)dm
- Mass light ratio
- M ☉ / L ☉
- Size
- ~80,800 ly (24.76 kpc )
- Apparent size v
- 8.5′ × 5.9′
via Wikipedia infobox
Wikidata facts
- Distance from Earth
- 7.0
- Image
- Low brightness, high interest (potw2532a).jpg
Show 9 more facts
- Commons category
- NGC 45
- catalog code
- LEDA 930
- galaxy morphological type
- SA(s)dm
- time of discovery or invention
- 1835-11-11
- redshift
- 0.001544
- apparent magnitude
- 9.094
- right ascension
- 3.5166208
- declination
- -23.1820917
- radial velocity
- 463
Sources (2)
via Wikidata · CC0
~2 min read
Article
NGC 45 is a low surface brightness spiral galaxy in the equatorial constellation of Cetus. It was discovered by the English astronomer John Herschel on 11 November 1835. The galaxy is located at a distance of 22 million light years and is receding with a heliocentric radial velocity of 466 km/s. It is located in the vicinity of the Sculptor Group, but is most likely a background galaxy.
The morphological class of NGC 45 is SA(s)dm, indicating this is a spiral galaxy with no prominent inner bar (SA) or ring (s) feature. There is no central bulge to speak of. The galactic plane is inclined at an angle of 55°±5° to the line of sight from the Earth, with the major axis of the elliptical profile being aligned along a position angle of 145°±5°. Star formation is proceeding at a modest rate of ~0.20 M☉·yr.