NGC 188

NGC 188

NGC 188
Observation data (J2000 epoch)
Constellation Cepheus
Right ascension 00h 48m 26s[1]
Declination +85° 15.3[1]
Distance 5,400 ly[2] (1.66 kpc)
Apparent magnitude (V) 10.0 [3]
Apparent dimensions (V) 15
Physical characteristics
Radius unknown
Other designations Cl Melotte 2,[1] Caldwell 1

NGC 188 is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters that drift apart after a few million years because of the gravitational interaction of our Milky Way galaxy, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters known, at approximately 6.8 billion years old.[4] NGC 188 is very close to the North Celestial Pole, under five degrees away, and in the constellation of Cepheus at an estimated 5,000 light year distance, this puts it slightly above the Milky Way's disc and further from the center of the galaxy than the Sun.

See also

References

  1. 1 2 3 "NGC 188". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-12-08.
  2. Bonatto, C.; Bica, E.; Santos, J. F. C., Jr. (2005). "Spatial dependence of 2MASS luminosity and mass functions in the old open cluster NGC 188". Astronomy and Astrophysics. 433 (3): 917–929. arXiv:astro-ph/0502453Freely accessible. Bibcode:2005A&A...433..917B. doi:10.1051/0004-6361:20041113.
  3. Clark, R. N. (1990). Visual Astronomy of the Deep Sky. p. 287. ISBN 0521361559.
  4. VandenBerg, D. A.; Stetson, P. B. (2004). "On the Old Open Clusters M67 and NGC 188: Convective Core Overshooting, Color‐Temperature Relations, Distances, and Ages". Publications of the Astronomical Society of the Pacific. 116 (825): 997–1011. Bibcode:2004PASP..116..997V. doi:10.1086/426340.

Coordinates: 00h 48m 26s, +85° 15′ 18″

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