NGC 6891

NGC 6891 (Also known as BD+12 4266, HD 192563, PK 54-12.1 or IRAS 20127+1233) is a bright asymmetrical planetary nebulae in the constellation of Delphinus (The dolphin) 11,784 light years from earth. NGC 6891 was discovered on September the 22 1884 by Ralph Copeland an English astronomer. NGC 6891 gas is ionized by a white dwarf in the central parts of NGC 6891 stripping electrons from NGC 6891 hydrogen atoms and causing a glow to NGC 6891.[1]

NGC 6891
Object typePlanetary nebula 
Other designationsBD+12 4266

HD 192563 IRAS 20127+1233

PK 54-12.1
Observation data
(Epoch J2000.0)
ConstellationDelphinus
20 15 08.8436589777
Declination+12 42 15.585470301
Redshift0.000140
Distance11,784 ly
12.51 ±0.23, 12.11 ±0.11, 12.2552 ±0.001, 11.099 ±0.013, 11.16 ±0.024, 10.553 ±0.027 
Estimated age28,000 y
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Appearance

A spherical outer halo is present in NGC 6891 and is expanding faster than the inner nebula and at least two ellipsoidal shells that are orientated differently. Filaments and knots are in nebula’s interior, surrounding the central white dwarf star. From the gas motions, astronomers estimate that one of the shells is 4,800 years old while the outer halo is some 28,000 years old, indicating a series of outbursts from the dying star at different times.[2]

Observation data

NGC 6891 has a right ascension of 20 15 08.8436589777, a declination of +12 42 15.585470301 and a epoch of J2000.0.[3] The redshift of NGC 6991 is 0.000140 and a radial velocity of 42.1.[4] NGC 6905, sh 2-82, IC 4997, NGC 6927A, M 27, Cr 399, NGC 6927 and PK 5-4.1 are nearby objects to NGC 6891 when observing the sky.[5]

References
  1. "Astronomy News | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2021-12-01.
  2. "NASA". NASA. Retrieved 2021-12-01.
  3. "-". -. 2021-07-30. Retrieved 2021-12-01.
  4. "Space and Universe Guide". www.universeguide.com. Retrieved 2021-12-01.
  5. Rojas, Sebastián García. "Telescopius - What's in Lat. 37.8, Lon. -97.8's Sky Tonight?". Telescopius. Retrieved 2021-12-01.
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