California Nebula

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California Nebula
California-nebula.jpeg
Observation data: J2000.0 epoch
Type Emission
Right ascension 04h 03m 18.00s
Declination +36° 25′ 18.0"
Distance 1,000 ly
Apparent magnitude (V) 6.0
Apparent dimensions (V) 2.5° long
Constellation Perseus
Physical characteristics
Radius -
Absolute magnitude (V) -
Notable features -
Other designations NGC 1499, Sharpless 220
See also: Diffuse nebula, Lists of nebulae

The California Nebula (NGC 1499) is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficult to observe visually. It can be observed with a Hβ filter (isolates the Hβ line at 486 nm) in a rich-field telescope under dark skies.[1] It lies at a distance of about 1,000 light years from Earth. Its fluorescence is due to excitation of the Hβ line in the nebula by the nearby prodigiously energetic O7 star, xi Persei (also known as Menkib, seen at center below it in the inset at right).[2]

The California Nebula was discovered by E. E. Barnard in 1884.

References[edit]

  1. ^ "The California Nebula". observing.skyhound.com. Retrieved December 23, 2013. 
  2. ^ "Menkib(Xi Persei)". Encyclopedia of Alternative Energy. 

External links[edit]