Abell 78 is a planetary nebula located in the constellation of Cygnus. It has a fainter halo consisting mostly hydrogen, and an inner elliptical ring that is mostly made of helium.

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Abell 78

Emission nebula
Planetary nebula
As Seen From Mount Lemmon Sky Center
Observation data: J2000.0 epoch
Right ascension	21h 35m 29.376s[1]
Declination	+31° 41m 45.6s[1]
Constellation	Cygnus
Physical characteristics
Radius	1.4 ly
Designations	PK 081-14.1, PN G 081.2-14.9, Abel 64, ARO 174, 2MASS J21352938+3141453, CSI+31-21334, UBV 18570, UBV M 44681
See also: Lists of nebulae

The central star of the planetary nebula has a spectral type of [WC5], similar to that of a carbon-rich Wolf–Rayet star.[1]

Gallery

• 
  An unusual type of Planetary Nebula

References

External links

• https://www.astronomy-mall.com/Adventures.In.Deep.Space/abellcat.htm
• NOAO>Outreach>Planetary Nebula Sampler: Abell 78

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