Lorenzo Comolli's Astronomy HomePage

Click on the image for a high res version. MOUSE OVER for H-alpha only. Look also to the H-alpha only hires.

Sh2-129 is a faint nebula only 4° West of IC1396. This image frames only the "brightest" part. In the past I've imaged this nebula with nearly half of the focal length and my Schmidt camera, see here, I think the new one is much better!
This image is an Ha-RGB composition, with most of the exposure focused on H-alpha emission (12h30min) and only a few RGB (2h). Be sure to look not only to the color version but also to the black and white Ha only version.

Technical Data
Optics	TEC 140
Focal Length	1011 mm
Focal Ratio	f/7.2
Exposure Time	Total 14 h 30 min, composed of Ha 12 h 30 min, RGB 40:40:40 min (single exp of 30 min for Ha, 10 min for RGB)
CCD	SBIG STL-11000M @-30°C
Location	Saint Barthelemy (AO, Italian Alps) at 1660 m height
Date	26-27 September 2014 (two nights)
Mount	Gemini G-41
Tracking	Lodestar on an 80mm f/5 refractor
Temperature and humidity	T= from +4 to +10 °C, RH= from 65 to 100%
Sky brightness at zenith (with SQM-L)	21.1 mag/arcsec^2
Notes	Imaged during the Saint Barthelemy Star Party 2014; this image won the third prize in the astrophotograpy contest of the star party!