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Sh2-261 / Lower’s Nebula

Classification: Diffuse Emission Nebula Sh2-261 / LBN863
Constellation: Orion (ORI)
Object Location: Ra 06h 09m 48s Dec +15° 48’37” (current)
Size & Distance: 30 x 50 Apx 3300 light years.

Date & Location: 01-17-2015 Little Blair Valley, CA.
Exposure: Hubble Palette SHO; 120, 120, 120, Sll=R, Ha=G, Olll=B. All 20min. (bin 1x1)
Optics: Telescope Engineering Company APO180FL @ f/5.23 using an Astro-Physics TCC160 F/L 941mm.
Mount: Astro-Physics 1200 GTO / ATS 10x36 pier.
Camera: FLI-ML6303E @-30c / CFW2-7 / FLI-Atlas focuser / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 3nm Ha, Sll, Olll
Software: MaxImDL 6.07, Photoshop CS5, CCDStack, Topaz Labs.

Notes: Sky conditions: Above average seeing, No wind, Temp low 30°
Image Field of view is 65 x 100 arcmin.

SH2-261 is a Hydrogen Alpha emission Nebula located in the upper area of Orion. The Hll region of Sh2-261 is often called Lower’s Nebula because it appears on a photographic plate taken by the team of Harold and Charles Lower. The Lowers were amateur astronomers, pioneering astrophotography in San Diego, California. Harold’s son constructed an 8” Schmidt camera in the mid 1930’s that was especially useful in photographing what are now called Hll regions.