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California Nebula

Classification: Emission Nebula / NGC1499 / Sh2-220 / LBN756
Constellation: Perseus (PER)
Object Location: Ra 04h 04m 15s Dec +36° 23’56° (current)
Size & Distance: Apx, 160.0 x 60.0 Apx 1000 light years

Date & Location: 11-09-2018 Little Blair Valley, CA
Exposure: SHO 120-120-120 8x15 ea. (bin 1x1)
Optics: Telescope Engineering Company APO110FL w/ TEC FF @ f/5.74, 631mm using the Optec FocusLynx
Mount: Astro-Physics 1200 GTOCP4 / ATS 10x36 pier.
Camera: FLI-PL16803 @-25c / FLI CFW5-7 / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 50mm square, 3nm Ha, Sll, Olll
Software: MaxImDL 6.10, Photoshop CS5, CCDStack. Topaz Studio.

Notes: Sky conditions: Average seeing, Calm winds, Temp mid 30’s°
Image Field of view is 197 x 197 arcmin. Image Scale 2.94 arcsec/pix

The California Nebula (NGC 1499) is an emission nebula located in the constellation Perseus. It’s named because it appears to resemble the outline of California on long exposures. 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.