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Monday, February 6, 2012

Sharpless 145, a dim and large nebula in Cepheus

Sh2-145, a large Nebula in constellation Cepheus
RA 22h 28m 44s  DE +64 08' 51" 

A bicolor composition from H-a and O-III

At night of 03.Feb, I was looking some targets in Cepheus. This area took my attention and I gave it whole night. I haven't been able to find any name for it from my sources. I's large, image spans 5,5 degrees horizontally, and dim. I shot it, with Canon EF 200mm f1.8 optics and QHY9 astronomical camera, five hours for H-a and two hours for O-III (binned down 3x3), camera was full open at f1.8. 
The "bright", mag 6,29, star, at Left middle, is known as HR 8568, location is RA 22h 28m 44s DE +64 08' 51" 
Thanks to "Never", in a Finnish astronomical forum "Avaruus",  all the objects are now identified!
The bright patch at top is Sh2-150. Formation at the middle is Sh2-145 and a bright spot, at lower Right, is Sh2-140. Star cluster Pismis-Monreo 1 locates inside of Sh2-140.

Orientation map

H-alpha channel

A bicolor closeup

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, 15x1200s 
O-III, binned down 3x3 2h. total exposure time 7 hours.
Calibration with Darks, Flats and Bias frames.

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