NGC 6638
NGC 6638 is a globular cluster in the constellation Sagittarius. It is magnitude 9.5 and diameter 2 arc minutes, class VI. It is a half degree East of Lambda Sagittarii.
| NGC 6638 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Class | VI |
| Constellation | Sagittarius |
| Right ascension | 18h 30m 56.2s |
| Declination | −25° 29′ 45″ |
| Apparent magnitude (V) | 9.5 |
| Apparent dimensions (V) | 2′ |
| Physical characteristics | |
The globular cluster was discovered in 1784 by the astronomer William Herschel with his 18.7-inch telescope and the discovery later in the New General Catalogue.
References
- Robert Burnham, Jr, Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system, vol 3, p.1557
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