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)
ClassVI
ConstellationSagittarius
Right ascension18h 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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