NGC 637 is an open cluster of stars in the northern constellation of Cassiopeia, positioned about 1.5° to the WNW of the star Epsilon Cassiopeiae.[2][5] The cluster was discovered on 9 November 1787 by German-born English astronomer William Herschel.[6] It is located in the Perseus Arm of the Milky Way,[7] at a distance of approximately 7.045 kilolight-years from the Sun.[1] The cluster is small but compact, and is readily visible in a small telescope.[2]
This is a young cluster with an estimated age of 5–15 million years.[3] It has a Trumpler class of I2m, indicating it is strongly concentrated (I) with an intermediate range of brightness variation (2) and a moderate richness of stars (m).[7] The cluster has 55[2] members and an angular radius of 4′.2, corresponding to a physical radius of 9.8 ly (3.0 pc).[7] It has a core radius of 0.36′±0.13′.[8]
The seven brightest members are all over 10th magnitude, with five known to be variable. A total of four β Cephei-type variables have been identified, one of the highest such totals for an open cluster.[9] A classical Be star candidate has been detected.[7] The distribution of the cluster's stars on the Hertzsprung–Russell diagram shows a noticeable gap on the main sequence, which is not explained by missing data.[8]
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NGC637 is an open cluster of stars in the northern constellation of Cassiopeia, positioned about 1.5° to the WNW of the star Epsilon Cassiopeiae. The...
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...
coordinates are RA 01h 29.5m , dec +63° 18′. It is located near the open cluster NGC637, and the bright magnitude +2.2 irregular variable star Gamma Cassiopeiae...
The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation...
II Program. The catalogue contains 400 objects. All objects are from the NGC. All objects are visible in mid northern latitudes, since they were all observed...
pS, R, bM, 2nd of 3". NGC 4333 is also classified as a LINER galaxy. Despite being listed in the Virgo Cluster catalog as VCC 637, it is not a member of...
discovery of tidal tails around the globular cluster NGC 5466". The Astrophysical Journal. 637 (1): L29–L32. arXiv:astro-ph/0511767. Bibcode:2006ApJ...
NGC 5307 is a planetary nebula in the southern constellation of Centaurus, positioned less than 3° to the northeast of the star Epsilon Centauri. It was...
Embedded within Messier 24. Associated with Messier 17. Associated with NGC 6820. Embedded within the Iris Nebula. There are some errors in Collinder's...
together with the name of the observing project (HUDF, SDSS, 3C, CFHQS, NGC/IC, etc.) This is a list of galaxies that are well known by something other...
binaries: The disappearance of N6946-BH1 following a failed supernova in NGC 6946 may have resulted in the formation of a black hole. Black holes in fiction...
NGC 1023, also known as the Perseus Lenticular Galaxy, is a barred lenticular galaxy, a member of the NGC 1023 group of galaxies in the Local Supercluster...
Seyfert 1 (X-ray source) CG 547 Emission-line Galaxy CG 637 CG 922 MCG+01-02-015 LEDA 1852 (Pisces) Pisces A Local Void Pisces B NGC 7077 NGC 6503 NGC 6789...
NGC 613 is a barred spiral galaxy located 67 million light years away in the southern constellation of Sculptor. This galaxy was discovered in 1798 by...
supernovae have been observed in the galaxy, and NGC 5962 has two satellite galaxies. Slightly fainter is NGC 5921, a barred spiral galaxy with a LINER-type...
in the Andromeda Galaxy. A second supernova, SN 1895B, was discovered in NGC 5253 a decade later. Early work on what was originally believed to be simply...
hole candidates include the Andromeda Galaxy, M32, M87, NGC 3115, NGC 3377, NGC 4258, NGC 4889, NGC 1277, OJ 287, APM 08279+5255 and the Sombrero Galaxy...
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