Sharpless
261 AKA Sh2-261 aka Lower's Nebula - HaRGB
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From GALAXYMAP.ORG:
The
HII region Sh 2-261 is often called Lower's nebula because it appears
on a photographic plate taken by the father-and-son team of Harold and
Charles Lower in 1939.
The Lowers were amateur astronomers, accomplished telescope makers and
pioneering astrophotographers from San Diego, California. Harold Lower
published a pamphlet
in 1939 describing an 8 inch Schmidt camera that he and his son had
constructed several years previously.
He notes that the camera has been especially useful in photographing
what are now called HII regions
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Here is the pure RGB for comparison:
Scope: AP155EDF w Focus Boss II
Camera: Moravian G4 (16803 ccd) w Astrondon Gen II HaLRGB
filters
Mount: Paramount MX
Guided w ST-402 and Borg 60mm guidescope
Acquired using TheSkyX
9/9/9 x 10 min RGB
6 x 20 min H-Alpha
All calibration done in PixInsight
RGB and H-Alpha processed separately in PixInsight;
Stars removed from the H-Alpha using StarXTerminator
Stars temporarily removed from RGB then added back.
Ha (starless)+RGB combine in
Photoshop CC plus extra clean-up and adjustments.
Lucknow, Ontario
February 2023
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