HR diagram showing the main sequence turnoff of NGC 188 and M 67, indicating their relatively high ages
NGC 188 (also known as Caldwell 1) 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-years' distance, this puts it slightly above the Milky Way's disc and further from the center of the galaxy than the Sun.
^ abc"NGC 188". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-12-08.
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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/0502453. Bibcode:2005A&A...433..917B. doi:10.1051/0004-6361:20041113.
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Clark, R. N. (1990). Visual Astronomy of the Deep Sky. Cambridge University Press. p. 287. Bibcode:1990vads.book.....C. ISBN 978-0-521-36155-2.
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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.
NGC188 (also known as Caldwell 1) is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters...
VandenBerg, D.A.; Stetson, P.B. (2004). "On the Old Open Clusters M67 and NGC188: Convective Core Overshooting, Color–Temperature Relations, Distances,...
broadcasting in North America C1 pylon, a type of high voltage pylon Caldwell 1 (NGC188), an open cluster in Cepheus C-1 visa, a type of visa for individuals transiting...
photometric search for peculiar stars in open clusters. V. NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756". Astronomy and Astrophysics. 412 (3): 721–725...
globular clusters in Milky Way's Galactic halo. Formation of globular cluster, NGC 6723, in the Milky Way's galactic halo 740 million years: 47 Tucanae, second-brightest...
general theory of relativity". The Principle of Relativity. Dover. pp. 175–188. Bibcode:1952prel.book..175E.{{cite book}}: CS1 maint: date and year (link)...
H–R diagram for two open clusters: NGC188 (blue) is older and shows a lower turn off from the main sequence than M67 (yellow). The dots outside the two...
objects, such as the Hyades, the Double Cluster (NGC 869 and NGC 884), and the Sculptor Galaxy (NGC 253). The Messier catalogue was actually compiled...
difficult. Based on NGC 7142's color-magnitude diagram, it is believed that this cluster is close in age to the old open clusters M 67 and NGC188 (although age...
molecule was first announced to have been observed in interstellar space, in NGC 7027, a planetary nebula within this galaxy. (Much later, atomic hydrogen...
galaxies. List of NGC objects (1–1000) List of NGC objects (1001–2000) List of NGC objects (2001–3000) List of NGC objects (3001–4000) List of NGC objects (4001–5000)...
XVIII. The Tidal Circularization Cutoff Period of the Old Open Cluster NGC188". The Astrophysical Journal. 602 (2): L121–L123. arXiv:astro-ph/0401582...
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