California Nebula

 

California Nebula
NGC 1499
10/11-25/2017
Perseus
BrewSky Observatory, Casa Grande, AZ
Takahashi FSQ106ED on Paramount MX with SBig STF8300M, Bader NB Filters
−5°C
# Exp (min) Filter Bin Net Time (hr)
26
26
12
12
Right 15 min
Left    15 min
Right  10 min
Left     10 min
HAlpha 1×1
2×2
17 hr
13
32
Right 15 min
Left   15 min
OIII 2×2 11.25
19
18
23
7
Right 15 min
Left    15 min
Right  10 min
Left    10 min
SII 1×1

2×2

14.25
Total 42.5 hr
Calibrated in MaximDL
Processed in PixInsight
This is a 2 panel Mosaic. The OIII signal was very weak; 1×1 bin subs show nothing even at 30 minutes. The 2×2 bins showed faint signal.

The California Nebula (NGC 1499) is an emission nebula located in the constellation Perseus.  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. 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).

The California Nebula was discovered by E. E. Barnard in 1884.   (Wikipedia)