NGC 6445
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Planetary Nebula NGC 6445 |
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| NGC 6445 | |
| AladinLite | |
| Constellation | Sagittarius |
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Position equinox : J2000.0 |
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| Right ascension | 17h 49m 15.0s |
| declination | -20 ° 00 ′ 34 ″ |
| Appearance | |
| Apparent brightness (visual) | 11.2 mag |
| Apparent brightness (B-band) | 13.2 mag |
| Angular expansion | 0.73 ′ × 0.73 ′ |
| Central star | |
| Physical data | |
| Radial velocity | −8 km / s |
| distance | 1380 pc |
| history | |
| discovery | Wilhelm Herschel |
| Date of discovery | May 28, 1786 |
| Catalog names | |
| NGC 6445 • ESO 589-PN9 • GC 4333 • H II 586 • h 1986 • IRAS 17462-1959 • PK 8 + 3.1 | |
NGC 6445 , also called Little Gem Nebula ("Little Jewel Nebula ") or Crescent Nebula ("Crescent Moon Nebula "), is an 11.2 mag bright planetary nebula in the constellation Sagittarius and about 1380 parsecs from Earth.
It was discovered on May 28, 1786 by Wilhelm Herschel with an 18.7-inch reflector telescope, who noted "pB, S, iF".