Emission nebula | |
---|---|
Planetary nebula | |
Observation data: J2000 epoch | |
Right ascension | 20h 20m 08.76s[1] |
Declination | +16° 43′ 53.7″[1] |
Distance | 14,090 (4,320 pc)[2] ly |
Apparent magnitude (V) | 11.15[1] |
Apparent dimensions (V) | 2.7″ x 1.4″ [3] |
Constellation | Delphinus[4] |
Physical characteristics | |
Radius | 0.092 ly |
Notable features | Bipolar outflow, Bipolar nebula |
Designations | IC 4997 PNG 058.3-10.9 |
IC 4997 is a planetary nebula located in the constellation of Delphinus.[4] It was discovered in 1896 by Edward Charles Pickering and Williamina Fleming,[5] and independently by Gustav Gruss the same year.[6] This nebula is about 14,000 light-years from Earth.[2] It looks like an ordinary star in smaller telescopes, and only detailed study of its spectrum reveals its nebular characteristics.[7]
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