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Monday, January 11, 2021

First new photo for the Year 2021

 Between Cygnus and Cepheus, near the constellation Lacerta, locates the Sharpless 124 (Sh2-124) 
This emission nebula is kind of large and has a brighter formation at middle of it. There is some very dim O-III emission too, generally this emission nebula is not  a very easy target for imagers.
There are very few good phoptos of it around.

My wide field setup covers enough sky to capture both, the Cocoon Nebula (Sh2-125) and the Sharpless-124 in a same field of view. Data for the photo was shot at December 2020

Sharpless 124 and the Cocoon Nebula
Click for a large image

Cocoon Nebula can be seen at lower left corner, Sh2-124 at center. Photo in mapped colors, from the emission of ionized elements,R=Sulfur, G=Hydrogen and B=Oxygen. (Known as Hubble Palette) 
NOTE, an apparent size of the Moon as a scale

A closeup
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The starfield is very densy in this part of  Milky Way

An older longer focal length photo
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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
Tokina AT-x 300mm f2.8 camera lens

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200

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

Total exposure time
H-alpha, 6 x 1200 s, binned 1x1 = 2 h
O-III, 3x 1200 s, binned 2x2 = 1h
S-II, 3x1200 s, binned 2x2 = 1h

H-alpha channel alone (Two hours)
Click for a large image

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