NGC 2158
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| SDSS recording, angle of view 13.5 '× 13.5' | |
| AladinLite | |
| Constellation | Twins |
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Position equinox : J2000.0 |
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|---|---|
| Right ascension | 06 h 07 m 25.6 s |
| declination | + 24 ° 05 ′ 46 ″ |
| Appearance
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| classification | II3r |
| Brightness (visual) | 8.6 likes |
| Brightness (B-band) | 9.49 likes |
| Angular expansion | 5 ' |
| Number of stars | > 10,000 stars |
| Brightest star | +12 to +13 mag |
| Variable stars | 97 |
| Redness ( excess color E (BV)) | 0.360 |
| Physical data
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| distance | approx. 16200 ly (4980 pc ) |
| Age | > 1 billion years |
| history | |
| Discovered by | Wilhelm Herschel |
| Discovery time | November 16, 1784 |
| Catalog names | |
| NGC 2158 • C 0604 + 241 • OCl 468 • Mel 40 • Cr 81 • Lund 205 • GC 1351 • H VI 17 • h 375 • Raab 30 | |
NGC 2158 is an open star cluster in the constellation Gemini . It is only about 15 'southwest of the edge of the much brighter M35 cluster . The star cluster, discovered by Wilhelm Herschel on November 16, 1784 , has an apparent diameter of only 5 'and a brightness of 8.6 mag. The stars of the more than 1 billion year old star cluster are highly concentrated, similar to a globular cluster . That is why he used to be thought of as such; due to its age, however, the identification as an open star cluster is clear.
If you have NGC 2158 together with M35 in the telescope's field of view, the contrast in size and star density is particularly clear. NGC 2158 is five times farther away, but has at least 10 times more stars and is much older.
Web links
- Open Star Clusters M35 and NGC 2158 - Astronomy Picture of the Day from November 29, 2002 (English).
- Spektrum.de : Amateur recording [1] [2] [3]
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b SEDS : NGC 2158
- ↑ SIMBAD database
- ↑ a b GoBlack: NGC 2158 open star cluster in the constellation Gemini
- ↑ Papers: Planets in Stellar Clusters Extensive Search. IV. A detection of a possible transiting planet candidate in the open cluster NGC 2158 ( Memento from October 7, 2006 in the Internet Archive )
- ↑ webda.physics.muni.cz: WEBDA page for open cluster NGC 2158 , accessed on May 3, 2019
- ↑ AL Tadross: A catalog of 120 NGC open star cluster . In: Journal of the Korean Astronomical Society , 44, 2011, pp. 1-11. doi: 10.5303 / JKAS.2011.44.1.1 .
- ↑ Seligman