California Nebula

22 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: William Optics FLT 98
Imaging cameras: QSI 583wsg
Mounts: Astro-Physics AP 900 GTO
Guiding telescopes or lenses: William Optics FLT 98
Guiding cameras: Starlight Xpress Lodestar Lodestar Autoguider
Filters: Astrodon 3nm OIII, Baader 7nm Ha, Astrodon 5nm S2
Resolution: 3306×2445
Frames: 33×1800″
Integration: 16.5 hours

Аuthor: marc

Astrophotography of the day of  SPONLI, 22.11.2014