NGC 147

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Galaxy
NGC 147
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NGC 147 [1] amateur recording
NGC 147 amateur recording
AladinLite
Constellation Cassiopeia
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 00 h 33 m 12.12 s
declination + 48 ° 30 ′ 31.5 ″
Appearance
Morphological type dSph / dE5  
Brightness  (visual) 9.4 mag
Brightness  (B-band) 10.4 mag
Angular expansion 13.2 ′ × 7.8 ′
Position angle 25 °
Surface brightness 14.5 mag / arcmin²
Physical data
Affiliation Local group
Andromeda subgroup
Messier 31 group
LGG 11  
Redshift −0.000644 ± 0.000010  
Radial velocity −193 ± 3 km / s  
Absolute brightness −15.5 mag
Dimensions 10 8 to 10 9 M ☉
diameter approx. 10,500 ly
history
discovery John Herschel
Discovery date September 8, 1829
Catalog names
NGC  147 • UGC  326 • PGC  2004 • CGCG  550-006 • MCG  + 08-02-005 • 2MASX  J00331212 + 4830314 • GC  72 • h  29 • DDO 3

NGC 147 is an elliptical dwarf galaxy of the Hubble-type dE5 in the constellation Cassiopeia in the northern sky . The galaxy is an estimated 300,000 light years away from Andromeda (roughly the same distance as between the Milky Way and the Large Magellanic Cloud ) and is about 8,000 light years in size along its largest dimension. It is a companion galaxy to the Andromeda galaxy and, together with NGC 185, forms a gravitationally bound galaxy pair.

The supernovae SN 1954J (Type-IIP?) And SN 2002kg (Type-IIn?) Were observed here.

The object was discovered on September 8, 1829 by the British astronomer John Herschel . Belonging to the local group was confirmed by Walter Baade in 1944 when he was able to resolve individual stars with the 100-inch telescope at Mount Wilson Observatory .

Web links

Commons : NGC 147  - collection of images, videos, and audio files

Individual evidence

  1. ^ Aladin Lite
  2. ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e f SEDS : NGC 147
  4. ↑ Simbad
  5. ↑ Seligman