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Monday, January 25, 2021

Lower's Nebula

 I originally shot this data at february 2016, this is a reprocessed version. Lower's Nebula is also known as Sharpless 261 (Sh2-261) and it located in constellation Orion at an estimated distance of about 3300 light years, This is not a bright object, especially the O-III signal is very weak. Seeing wasn't very good at the time.

Lower's Nebula (Sh2-261)
Click for a large image

Image is in mapped colors from an emission of  the ionized elements. Golden areas are from emission of sulfur and hydrogen, S-II and H-alpha, blueish areas are from ionized oxygen, O-III.

Image in visual spectrum
Click for a large image

Natural color scheme from the emission of an ionized elements, H-a, S-II and O-III. This is a very dim and diffused nebula, this image spans vertically about one degrees

Technical details

Processing work flow

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 @ f7 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 x2 and SXV-AOL

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

Exposure times
H-alpha, 15 x 1200s = 5h
O-III, 6 x 1200s binned 4x4 = 2h min.
S-II, 6 x 1200s  binned 4x4 = 2h min.
Total 9h


Juan Carlos said...

I have your image of this nebula with much less contrast, a great job, congratulations!

Unknown said...

Your work is absolutely amazing! I had no idea space was this beautiful. Thank you for this display.