NGC 654
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| AladinLite | |
| Constellation | Cassiopeia |
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Position equinox : J2000.0 |
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|---|---|
| Right ascension | 01 h 43 m 59.4 s |
| declination | + 61 ° 52 ′ 58 ″ |
| Appearance
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| classification | II 3 m |
| Brightness (visual) | 6.5 mag |
| Angular expansion | 6 ′ |
| Redness ( excess color E (BV)) | 0.868 |
| Physical data
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| Affiliation |
Milky Way , Cas OB8 |
| Radial velocity | −38.79 km / s |
| distance | 6650 ly (2041 pc ) |
| history | |
| Discovered by | William Herschel |
| Discovery time | November 3, 1787 |
| Catalog names | |
| NGC 654 • C 0140 + 616 • OCl 330 • Mel 9 • Cr 18 • Lund 53 • GC 387 • H VII 46 • h 145 • | |
NGC 654 is an open star cluster in the constellation Cassiopeia . NGC 654 is 6 ′ in diameter and has an apparent magnitude of 6.5 mag. NGC 654 belongs to the OB association Cassiopeia OB8 , which includes NGC 663 and Messier 103 , among others .
The object was discovered on November 3, 1787 by the German-British astronomer Friedrich Wilhelm Herschel .
Web links
- SIMBAD Astronomical Database
- Spektrum.de : Amateur recordings [1] [2]
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c NGC 654
- ↑ a b A site Devoted to Stellar Clusters in the Galaxy and the Magellanic Clouds
- ↑ SIMBAD database
- ↑ Seligman