NGC 6204
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| AladinLite | |
| Constellation | altar |
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Position equinox : J2000.0 |
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|---|---|
| Right ascension | 16 h 46 m 09.5 s |
| declination | -47 ° 01 ′ 01 ″ |
| Appearance
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| classification | I2p |
| Brightness (visual) | 8.2 likes |
| Angular expansion | 6.0 ' |
| Redness ( excess color E (BV)) | approx. 0.5 |
| Physical data
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| Affiliation | Milky Way |
| distance | 3500 ly (1085 pc ) |
| history | |
| Discovered by | James Dunlop |
| Discovery time | May 13, 1826 |
| Catalog names | |
| NGC 6204 • C 1642-469 • OCl 982 • Cr 312 • Lund 723 • ESO 277-SC10 • GC 4229 • h 3644 • VdB 196 | |
NGC 6204 is a galactic open star cluster in the constellation Altar . In the sky it is only about 6 arc minutes away from the further open star cluster Hogg 22 , from which it differs in its older age and shorter distance. More recent studies locate the cluster with the Trumpler classification I2p due to isochronous fits at a distance of around 3500 light years .
The star cluster was discovered on May 13, 1826 by James Dunlop , who noted while observing with a 9-inch reflecting telescope: “seven or eight small stars in a group, about 1 ′ diameter, with a minute line of stars on the north side ".
literature
- Carraro, Giovanni; Munari, Ulisse (2004): A multicolour CCD photometric study of the open clusters NGC 2866, Pismis 19, Westerlund 2, ESO96-SC04, NGC 5617 and NGC 6204 ; Monthly Notices of the Royal Astronomical Society 347 (2), pp. 625-631
- Martínez, R .; Vergne, MM; Feinstein, C. (2004): Optical polarization observations in Hogg 22 and NGC 6204 ; Astronomy and Astrophysics 419, pp. 965-973
Web links
- NGC 6204 at SIMBAD (English)