Hemisphere:  Northern  ·  Constellation: Orion (Ori)  ·  Contains:  69 f01 Ori  ·  Sh2-261  ·  The star 69Ori
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Lowers nebula SH2-261, 



    
        

            Roy Hagen
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Lowers nebula SH2-261

Getting plate-solving status, please wait...
Lowers nebula SH2-261, 



    
        

            Roy Hagen
Powered byPixInsight

Lowers nebula SH2-261

Imaging telescopes or lenses: William Optics FLT 132 Triplet APO

Imaging cameras: ZWO ASI 071MC PRO Cool

Mounts: Ioptron Tri Pier  ·  iOptron CEM60

Guiding telescopes or lenses: William Optics Z61 MKII

Guiding cameras: ZWO ASI224MC

Focal reducers: William Optics Flattener 7 Apo 0,8

Software: Pleiades Astrophoto PixInisight  ·  ZWO Asiair Asiair App iPad  ·  Adobe Photoshop 2020 CC 2020

Filters: Radian Telescopes 2" Triad Ultra Quad-Band

Accessory: ZWO ASIAIR  ·  ZWO EAF Electronic Auto Focuser  ·  Starizona Filter Slider  ·  William Optics Bathinov Focus Mask  ·  TPO Extension tube 2" Extension Tube 80mm  ·  Pegausus PPB Pocket Power Box


Dates:Feb. 3, 2021Feb. 4, 2021Feb. 5, 2021Feb. 6, 2021Feb. 7, 2021

Frames:Radian Telescopes 2" Triad Ultra Quad-Band: 320x180" (16h) (gain: 45.00) -20C bin 1x1

Integration: 16h

Darks: ~60

Flats: ~100

Bias: ~100

Avg. Moon age: 22.95 days

Avg. Moon phase: 41.92%

Bortle Dark-Sky Scale: 6.00


Astrometry.net job: 4230445

RA center: 6h 8' 57"

DEC center: +15° 41' 28"

Pixel scale: 1.354 arcsec/pixel

Orientation: 2.198 degrees

Field radius: 1.081 degrees


Resolution: 4792x3180

Locations: Frontyard, Geithus, Buskerud, Norway

Data source: Backyard

Description

This emission nebula is located in the constellation Orion at a distance of (more or less) 3300 lightyears from my camera sensor.
The nebula was discovered in 1939 on a photographic plate taken by Harold and Charles Lower.
Harold, and his son Charles, amateur astronomers from San Diego, CA was also pioneering astrophotographers and skilled telescope makers.
The telescope that Harold and Charles constructed, an 8”, F1 Schmidt camera with a 7” guide scope, is described in the book “Telescope making”, volume 2, by Albert G. Ingalls.
I found it quite interesting that Harold Lower described a 300 pounds(136kg) mounting as “portable”(not for my back).
Books nowadays seems to be an underrated source of information and I guess that somewhere along the digital revolution, we have forgotten the magic of reading books.

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  • Lowers nebula SH2-261, 



    
        

            Roy Hagen
    Original
  • Lowers nebula SH2-261, 



    
        

            Roy Hagen
    C
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    Lowers nebula SH2-261, 



    
        

            Roy Hagen
    F

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Sky plot

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Histogram

Lowers nebula SH2-261, 



    
        

            Roy Hagen