File:Caldwell_17_(50290241446).jpg · Wikimedia Commons · See Wikimedia Commons
Q493581
Sign in to saveAlso known as New General Catalogue 147, ZWG 550.6, MCG 8-2-5
elliptical galaxy in the constellation Cassiopeia
Key facts
- Constellation
- Cassiopeia
- Right ascension
- 00 33 12.1
- Declination
- +48 ° 30 ′ 32 ″
- Redshift
- −193 ± 3 km/ s
- Distance
- 2.53 ± 0.11 Mly (780 ± 30 kpc )
- Type
- dSph/dE5
- Apparent size v
- 13.2 ′ × 7.8 ′
- Notable features
- satellite galaxy of M31
via Wikipedia infobox
Wikidata facts
- Instance of
- elliptical galaxy
- Constellation
- Cassiopeia
- Parent body
- Andromeda Galaxy
- Distance from Earth
- 712
- Image
- NGC147.jpg
Show 12 more facts
- catalog code
- DDO 3
- right ascension
- 8.3005000
- declination
- 48.5087389
- Commons category
- NGC 147
- companion of
- Q490334
- discoverer or inventor
- John Frederick William Herschel
- time of discovery or invention
- 1829-09-08
- redshift
- -0.000644
- apparent magnitude
- 7.201
- galaxy morphological type
- dGspD...
- radial velocity
- -193.1
- epoch
- J2000.0
Sources (2)
via Wikidata · CC0
~3 min read
Encyclopedic overview
NGC 147 (also known as DDO3 or Caldwell 17) is a dwarf spheroidal galaxy about 2.58 Mly away in the constellation Cassiopeia. NGC 147 is a member of the Local Group of galaxies and a satellite galaxy of the Andromeda Galaxy (M31). It forms a physical pair with the nearby galaxy NGC 185, another remote satellite of M31. It was discovered by John Herschel in September 1829. Visually it is both fainter and slightly larger than NGC 185 (and therefore has a considerably lower surface brightness). This means that NGC 147 is more difficult to see than NGC 185, which is visible in small telescopes. In the Webb Society Deep-Sky Observer's Handbook, the visual appearance of NGC 147 is described as follows:
Large, quite faint, irregularly round; it brightens in the middle to a stellar nucleus.
Excerpted from Wikipedia’s “Q493581” article, available under the CC BY-SA 4.0 licence.