||Dark Nebula / IC4603-4-5-6 / vdB107 / M4 / Sh2-9
||Ophiuchus (OPH) & Scorpius (SCO)
||Ra 16h m 24s Dec -25° 26’
|Size & Distance:
||4.5° x 6.5° Apx 500 light years
|Date & Location:
||05-22-2012 Little Blair Valley, CA
||LRGB L= 2 @ 5 min, RGB= 3 ea. @ 5 min. All (bin 2x2)
||Nikon 180ed lens open to f/4
||Astro-Physics 900 GTO / ATS 10x36 pier.
||SBIG-STL6303E @-20c Guided by TV60 / SBIG-RGH
||Astrodon G2 LRGB
||MaxImDL 4.56, Photoshop CS5
||Sky conditions: Good seeing, Light wind, Temp 60°
Image Field of view is apx 5.8° x 8.7°
The Rho Ophiuchi cloud complex is a dark nebula of gas and dust that is located 1° south of the star ρ Ophiuchi of the constellation Ophiuchus. This cloud is one of the closest star-forming regions to the Solar System.
The cloud covers an angular area of 4.5° × 6.5° on the celestial sphere. It consists of two major regions of dense gas and dust. Some of the structures within the complex appear to be the result of a shock front passing through the clouds from the direction of the neighboring Sco OB2 association.