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 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.
The California Nebula was discovered by E. E. Barnard in 1884.
Ha(3nm): 4 x 10min (Tot: 40 min) Bin:2x2
ASA N12 Astrograph F/3.6
3" Wynne Reducer Corrector 0.73x
Atik 490 EX camera @-20C
Astrodon Ha 3nm
Valla Observatory (FROSON, Sweden)
Feb 27, 2015
Images calibrated and processed in AstroPix
Calibration by applying Flat-Field
Registration with the AstroPix registration tool.
Color image with the AstroPix RGB mix tool.
Noise removal with the AstroPix Noise removal tool.
Only red channel used
Scale: 0.92 arcsec/pix
FOW: 52x42 arcmin