IC4604 - Rho Ophiuchus Nebula (v.2)  
Ophiucus

This amazing complex of nebulosity revealed on long exposure color photographs is one of the most beautiful areas of the entire night sky.		  
 
It contains dark nebulae where lanes of obscuring dust hide background stars, blue reflection nebulae where the dust is illuminated by nearby stars and red emission nebulae where the hot hydrogen gas itself is glowing.

Also visible is a rare orange/yellow reflection nebula around the red-giant star Antares which is the overexposed object just to the left and slightly below the center of the photo.

Rho Ophiuchi is the triple-star surrounded by IC4604, the large blue reflection nebula at the left of the photo. Emission (red) nebula Sh2-9 is at right. IC4603 is the blue nebula at center.		  
 
Technical details:  
Location:  
 Soria - Spain
Date:  
 02/03/2009 (dd/mm/yyyy)
Conditions:  
 Very good
Temperature:  
 5ºC
Humidity:  
 low
 
Telescope:  
 Long Perng ED80 f/6.9
Reducer/corrector:  
 WilliamOptics Flattener 0.8x III
Filter:  
 IDAS LPS 2"
Mount:  
 Vixen GPD2 Autostar Meade
Camera:  
 Canon 350D no filter
Exposure:  
 8x300s@ISO800
Guiding tube:  
 B&C 60/350 f7
Guiding camera:  
 Meade DSI Pro
Guiding software:  
 MaximDL
 
Procesing:  
 Standard processing techniques: stacked, star masrking, level and curves adjustment, noise reduction and final adjustments.

UPDATE may-2009: Newly processed using SMI (Screen Mask Invert) with PixInsight-LE.		  
Notes:  
 This is really a test, the very first time I tried this object known as dificult due to it's low altitude over horizon. Guiding was far from perfect and as few as 10 pictures was taken (2 of then was discarded)

This object looks better with low power, wide field telescopes/tele lens.		  
     

 
All Contents Copyright by Jaime Fernández and Copyright of their respectives owners. Text mainly extracted from Wikipedia.
All Jaime Fernandez propietary contents freely available for non-profit purposes,
otherwise I beg you for a fair contribution to NGO Medicos Sin Fronteras proportional to the profit obtained.

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