| 词条 | NGC 6638 |
| 释义 |
| | name = NGC 6638 | image = | caption = | credit = | epoch = J2000 | class = VI | constellation = Sagittarius | ra = {{RA|18|30|56.2}} | dec = {{DEC|-25|29|45}} | dist_ly = | appmag_v = 9.5 | size_v = 2′ | mass_msol = | radius_ly = | v_hb = | metal_fe = | age = | notes = | names = }} 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. 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
External links
3 : Globular clusters|Sagittarius (constellation)|NGC objects |
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