NGC 6644
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Planetary Nebula NGC 6644 |
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| Hα image from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Sagittarius |
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Position equinox : J2000.0 |
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| Right ascension | 18h 32m 34.7s |
| declination | -25 ° 07 ′ 46 ″ |
| Appearance | |
| Apparent brightness (visual) | 10.7 mag |
| Apparent brightness (B-band) | 12.2 mag |
| Angular expansion | 0.2 ' |
| Central star | |
| Apparent brightness | 15.9 mag |
| Physical data | |
| history | |
| discovery | Edward Charles Pickering |
| Date of discovery | July 13, 1880 |
| Catalog names | |
| NGC 6644 • PK 8-7.2 • ESO 522-PN33 • | |
NGC 6644 is a planetary nebula in the constellation Sagittarius . The celestial object was first described in 1888 in NGC , who named the American astronomer Edward Charles Pickering as the discoverer in 1880 using a 15-inch telescope; it was identified as a planetary nebula by Edwin Hubble in 1921 .