Old planetary nebula Sh2-216 (Maciej)

Celestial hemisphere: Northern · Constellation: Perseus (Per)

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Old planetary nebula Sh2-216

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Old planetary nebula Sh2-216

Sh2-216 is an old planetary nebula, one of the closest to Earth, discovered in 1955 by Hugh M. Johnson. Its origin was determined in the early 1980s after studies and photographs showing emissions from the SII and OIII lines. This assumption was confirmed in 1984 when a low nebula expansion rate of less than 4 km/s was spectroscopically determined, indicating that the nebula's expansion was largely slowed down by interstellar material as well as two candidates for an ionizing "central star" nebula. They have been shifted halfway to the edge - and are in a position that explains the asymmetry of the nebula - due to the proper motion of the stars and the age of the nebula. The more likely of the two stars was subsequently confirmed in 1992. In 2022, with the help of the specialized Gaia space telescope, the distance from Earth was determined to be 128 parsecs, the diameter to be 3.7 parsecs, the kinematic age to be around 300,000 years, and the evolutionary age to be 96,000 years. (Wiki)

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Old planetary nebula Sh2-216

Old planetary nebula Sh2-216

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Old planetary nebula Sh2-216

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