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Sh2-261 Lower's Nebula BiColor Ha & OIII, 




    

        Douglas J Struble
Sh2-261 Lower's Nebula BiColor Ha & OIII

Sh2-261 Lower's Nebula BiColor Ha & OIII

Technical card

Resolution: 3053x2444

Dates: Feb. 25, 2018April 22, 2018

Frames:
Astrodon Ha 5nm: 104x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 66x240" (gain: 139.00) -20C bin 1x1

Integration: 11.3 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 8.33 days

Avg. Moon phase: 59.57%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 2045091

RA center: 92.217 degrees

DEC center: 15.766 degrees

Pixel scale: 0.675 arcsec/pixel

Orientation: 23.682 degrees

Field radius: 0.366 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Unknown

Description

Sh2-261 Lower's Nebula is super faint. I was hoping to finish it off in the Hubble Palette, but my main Astro-Physics Mach1 mount was gone for a month for warranty repair, so I lost a lot of time. It is now dipping into the west with less than a half hour to work with each night, so had to call it here in this bicolor palette.

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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dugstruble
Douglas J Struble
License: None (All rights reserved)
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Sh2-261 Lower's Nebula BiColor Ha & OIII, 




    

        Douglas J Struble