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Sunday, February 5, 2012

Sharpless 205, Sh2-205




Sh2-205
At border of  Perseus and Camelopardalis

Image in HST-palette from ionized elements, Red=Sulfur, Green=Hydrogen & Blue=Oxygen. 
Click for a large image!

This Sharpless object is very dim and difficult to shoot (as they usually are). The bright, peanut shape, area at middle is known as Sh2-205, bright nebula, at top left, is NGC 1491. Image spans about 5,5 degrees horizontally, that's 11 full Moons side by side. There are very few images around out of this object. Total exposure time, with a fast 200mm f1.8 optics, is 12h from three nights between 28.01 - 02.02. 2012.


A closeup


Image in visual spectrum

Narrow band channels combined to a visual spectrum, R=Hydrogen + Sulfur, G=Oxygen and 
B=Oxygen + Hydrogen.



Technical details:

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves, color and mosaic combine in PS CS3.

Optics, Canon EF 200mm camera lens at f1.8
Camera, QHY9
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5,5 arcseconds/pixel
Exposures, Baader 7nm H-a, 12x1800s + 15x1200s = 11h
O-III, binned down 3x3 1h. total exposure time12 hours.
Calibration with Darks, Flats and Bias frames.

2 comments:

Eko said...

Ovat hienot värit tuolla avaruudessa...!
Jotain aivan ennen näkemätöntä - minulle.
Kuvien compositio on myös kohdallaan. Simä 'lepää' - taitavaa taidetta...

J-P Metsävainio said...

Kiitos mukavasta palautteesta!
Värit tulevat esiin vasta pitkillä valotuksilla tosin, visuaalisesti isollakin putkella näkyy vain harmaan sävyjä. Silmä ei ole hyvä näkemään värejä vähässä valossa.