NGC 129
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| NGC 129 | |
| AladinLite | |
| Constellation | Cassiopeia |
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Position equinox : J2000.0 |
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|---|---|
| Right ascension | 00 h 29 m 58 s |
| declination | + 60 ° 12 ′ 40 ″ |
| Appearance
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| classification | IV 2 p |
| Brightness (visual) | 6.5 mag |
| Brightness (B-band) | 7.33 mag |
| Angular expansion | 12 ' |
| Number of stars | 35 |
| Brightest star | DL Cas , 9.3 to 8.6 mag |
| Variable stars | DL Cas |
| Redness ( excess color E (BV)) | 0.548 mag |
| Physical data
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| Affiliation | Milky Way |
| Redshift | -0.000144 ± 0.000012 |
| Radial velocity | -43 (± 3) km / s |
| distance | approx. 9900 ly (approx. 3000 pc ) |
| Age | 76 (± 4) million years |
| history | |
| Discovered by | Friedrich Wilhelm Herschel |
| Discovery time | December 16, 1788 |
| Catalog names | |
| NGC 129 • C 0027 + 599 • OCl 294 • Cr 2 • Lund 15 • GC 63 • h 24 • H VIII 79 | |
NGC 129 is an IV2p type open star cluster in the constellation Cassiopeia in the northern sky . NGC 129 is about 9,900 light years from Earth and has an apparent magnitude of +6.5 mag. Its age is estimated to be around 76 million years. The Cepheid DL Cas is a member of this star cluster.
The open star cluster NGC 129 was discovered on December 16, 1788 by the German-British astronomer Friedrich Wilhelm Herschel .
Web links
- NGC catalog
- DL Cas in NGC 129 , bibcode : 1959ApJ ... 130 ... 80A
- SIMBAD query
- SEDS
- NASA / IPAC Extragalactic Database
swell
- ↑ NASA / IPAC Extragalactic Database. Retrieved March 9, 2008 .
- ^ A b Students for the Exploration and Development of Space. Retrieved March 9, 2008 .
- ↑ a b c SIMBAD database, operated at CDS, Strasbourg, France. Retrieved March 9, 2008 .
- ^ Jean-Claude Mermilliod, Ernst Paunzen: A site Devoted to Stellar Clusters in the Galaxy and the Magellanic Clouds. Retrieved March 9, 2008 .
- ↑ Seligman