California Nebula

14 ноября

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).

Imaging telescopes or lenses: TeleVue NP101is
Imaging cameras: QSI 683 ws-8
Mounts: Orion Atlas EQ-G
Guiding telescopes or lenses: KW Telescopes KWIQ Guider
Guiding cameras: QHY5
Software: PixInsight
Filters: Astronomik 12nm OIII Filter, Astronomik 12nm H-Alpha, Astronomik 12nm SII Filter
Resolution: 3266×2441
Dates: Oct. 23, 2014
Locations: Rodeo, NM, USA
Astronomik 12nm H-Alpha: 9×480″ -20C bin 1×1
Astronomik 12nm OIII Filter: 9×360″ -20C bin 2×2
Astronomik 12nm SII Filter: 9×360″ -20C bin 2×2
Integration: 3.0 hours
Darks: ~20
Flats: ~10
Bias: ~40
Avg. Moon age: 28.65 days
Avg. Moon phase: 0.87%
RA center: 60.399 degrees
DEC center: 36.556 degrees
Pixel scale: 2.582 arcsec/pixel
Orientation: 78.390 degrees
Field radius: 1.462 degrees

Аuthor: Canrith314

Astrofotography of the day of SPONLI, 14.11.2014