NGC 6638
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Globular cluster NGC 6638 |
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|---|---|
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| AladinLite | |
| Constellation | Sagittarius |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 18 h 30 m 56.2 s |
| declination | -25 ° 29 ′ 47 ″ |
| Appearance | |
| Concentration class | VI |
| Brightness (visual) | 9.2 likes |
| Angular expansion | 7.3 ' |
| Physical data | |
| distance | 30.6 kLj |
| history | |
| discovery | William Herschel |
| Discovery date | July 12, 1784 |
| Catalog names | |
| NGC 6638 • C 1827-255, GCl 95, • GCl 95 • ESO 522-SC30 • GC 4412 • Bennett 111, I 51, h 3748 | |
NGC 6638 is a globular cluster in the constellation Sagittarius . It is optically compact and is located about 40 arc minutes southeast of Lambda Sagittarii . The globular cluster was discovered in 1784 by the astronomer William Herschel with his 18.7-inch telescope and the discovery was later recorded in the New General Catalog .
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c SEDS : NGC 6638
- ↑ Steve O'Meara: Herschel 400 Observing Guide . Cambridge University Press, June 14, 2007, ISBN 978-0-521-85893-9 , pp. 234-.
- ↑ Seligman