Abell 31 is an ancient planetary nebula in the constellation of Cancer. It is estimated to be about 2,000 light years away. Although it is one of the largest planetary nebulae in the sky, it is not very bright.

This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (February 2014)

Abell 31

Emission nebula
Planetary nebula
As seen from Mount Lemmon Observatory
Observation data: J2000 epoch
Right ascension	08h 54m 11.4s
Declination	+08° 54′ 30″
Constellation	Cancer
Notable features	A very large and colorful PN
Designations	Sh2-290, PK 219.1+31.2, A 31, ARO 135
See also: Lists of nebulae

The central star of the planetary nebula is a white dwarf with a spectral type of DAO.[1]

References

• http://www.astronomy-mall.com/Adventures.In.Deep.Space/abellcat.htm
• http://observing.skyhound.com/archives/feb/PNG_219.1+31.2.html
• https://web.archive.org/web/20140222225156/http://www.astrosurf.com/zoll/images/abell31
• http://www.annesastronomynews.com/photo-gallery-ii/nebulae-clouds/abell-31-by-adam-block/

External links

• http://www.space.com/14747-abell31-nebula-photo-skywatching.html

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