NGC 7662

NGC 7662 (also known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22) is a planetary nebula located in the constellation Andromeda.

NGC 7662
Emission nebula
Planetary nebula
A Hubble Space Telescope (HST) image of NGC 7662.
Credit: HST/NASA/ESA.[1]
Observation data: J2000 epoch
Right ascension23h 25m 54s[2]
Declination+42° 32′ 6″[2]
Distance~2000-6000 ly
Apparent magnitude (V)8.6[3]
Apparent dimensions (V)37″
ConstellationAndromeda
Physical characteristics
Radius0.8 ly
DesignationsPK 106-17 1, GCRV 14695, PN ARO 20, Blue Snowball Nebula, Snowball Nebula, Caldwell 22

NGC 7662 is a popular planetary nebula for casual observers. A small telescope will reveal a star-like object with slight nebulosity. A 6" telescope with a magnification around 100x will reveal a slightly bluish disk, while telescopes with a primary mirror at least 16" in diameter may reveal slight color and brightness variations in the interior.

The central star of the planetary nebula is an subdwarfO star with a spectral type of sdO.[4]

See also

References
  1. The Hubble European Space Agency Information Centre Hubble picture of NGC 7662 Archived 2007-09-27 at the Wayback Machine
  2. "NGC 7662". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-10.
  3. Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
  4. González-Santamaría, I.; Manteiga, M.; Manchado, A.; Ulla, A.; Dafonte, C.; López Varela, P. (2021). "Planetary nebulae in Gaia EDR3: Central star identification, properties, and binarity". Astronomy & Astrophysics. 656: A51. arXiv:2109.12114. Bibcode:2021A&A...656A..51G. doi:10.1051/0004-6361/202141916. S2CID 237940344.

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