Hemisphere:  Northern  ·  Constellation: Orion (Ori)
Sh2-261: Lower's nebula, 



    
        

            Epicycle
Sh2-261: Lower's nebula
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Sh2-261: Lower's nebula

Technical card

Imaging telescopes or lenses: SkyWatcher 130/650 PDS Newton  ·  Teleskop-Service RC 6"

Imaging cameras: Atik 460EX Mono

Mounts: Sky-Watcher HEQ5 PRO

Guiding telescopes or lenses: SkyWatcher 130/650 PDS Newton  ·  Teleskop-Service RC 6"

Guiding cameras: Loadestar

Focal reducers: Astro Physics CCDT67 Telecompressor

Software: SequenceGeneratorPro  ·  PixInsight 1.8  ·  Photoshop  ·  PHD2  ·  EQMod

Filters: Astrodon 3nm OIII  ·  Astrodon Ha 5nm

Accessory: Baader MPCC MarkIII  ·  Lakeside Astro Motor Focus System  ·  Starlight Xpress Mini Filter wheel


Dates:Dec. 20, 2016Jan. 21, 2017Feb. 2, 2017

Frames:
Astrodon 3nm OIII: 13x1200" -15C bin 1x1
Astrodon Ha 5nm: 64x1200" -15C bin 1x1

Integration: 25.7 hours

Avg. Moon age: 16.91 days

Avg. Moon phase: 40.93%


Basic astrometry details

Astrometry.net job: 1471706

RA center: 6h 9' 1"

DEC center: +15° 45' 43"

Pixel scale: 1.024 arcsec/pixel

Orientation: 185.086 degrees

Field radius: 0.501 degrees


Resolution: 2749x2199

Data source: Backyard

Description

The region is ionised by the runaway star HD 41997, located inside the
blue core of the image, immediately above a curious lasso-like
structure.

Apologies for the multiple diffraction spikes affecting the bright stars, it's the result of using two scopes.

Comments

Sky plot

Sky plot

Histogram

Sh2-261: Lower's nebula, 



    
        

            Epicycle

In these public groups

UK Astro-Imaging
Narrowband imaging