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Wednesday, February 27, 2019

Sharpless 132 (Sh2-132)

My first photo for the Spring season 2019, Sharpless 132 in Kefeus.
Generally the start of the year 2019 has been very cloudy up here 65N. This four panel mosaic image has been taken between 1.1. and 11.2. 2019. Total exposure time is around 30h.

Sharpless 132 in Kefeus
Please, click for a large image

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. The signal for ionized oxygen,.

An experimental starless version
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When stars are removed, the actual shape of the nebula is easier to see.

A closeup
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Closeup of the central region of Sharpless 132.

Sharpless 132 is a very faint emission nebula, it locates at the border of Cepheus and Lacerta. Distance is about 10.000 lightyears. My photo covers about four square degrees of the sky. The blue color in the image is from the emission of an ionized Oxygen (O-III).

Technical details

Processing workflow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f10 with 0,7 focal reducer for Edge HD 1100 telescope

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and SXV-AOL

Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III

Total exposure time for all of the four panels

H-alpha, 48 x 1200 s, binned 2x2 = 16 h
O-III, 24 x 1200 s, binned 4x4 = 8 h.
S-II, 18 x 1200 s. binned 4x4 = 6 h

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