Hemisphere:  Northern  ·  Constellation: Orion (Ori)  ·  Contains:  69 f01 Ori  ·  Sh2-261  ·  The star 69Ori
Getting plate-solving status, please wait...
Sh2-261, 



    
        

            Gary Imm
Sh2-261, 



    
        

            Gary Imm

Sh2-261

Getting plate-solving status, please wait...
Sh2-261, 



    
        

            Gary Imm
Sh2-261, 



    
        

            Gary Imm

Sh2-261

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 6200 MM Pro

Mounts: Astro-Physics Mach1GTO

Guiding cameras: ZWO ASI 174 MM Mini

Software: Adobe Inc Lightroom Classic  ·  Main Sequence Software Sequence Generator Pro  ·  Pleaides Astrophoto PinInsight 1.8  ·  Adobe Inc Adobe Photoshop CC 2021  ·  Stark Labs PHD2 2.6.3

Filters: Chroma SII 3nm  ·  Chroma OIII 3nm  ·  Chroma Red 2" unmounted  ·  Chroma Ha 3nm  ·  Chroma Blue 2" unmounted  ·  Chroma Green 2" unmounted

Accessory: ZWO M68 OAG  ·  ZWO EFW 2″X7  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:March 1, 2021

Frames:
Chroma Blue 2" unmounted: 30x120" (gain: 0.00) -20C bin 1x1
Chroma Green 2" unmounted: 30x120" (gain: 0.00) -20C bin 1x1
Chroma Ha 3nm: 24x300" (gain: 100.00) -20C bin 1x1
Chroma OIII 3nm: 24x300" (gain: 0.00) -20C bin 1x1
Chroma Red 2" unmounted: 30x120" (gain: 0.00) -20C bin 1x1
Chroma SII 3nm: 24x300" (gain: 100.00) -20C bin 1x1

Integration: 9.0 hours

Avg. Moon age: 17.13 days

Avg. Moon phase: 93.78%


Astrometry.net job: 4394937

RA center: 6h 9' 4"

DEC center: +15° 47' 20"

Pixel scale: 0.885 arcsec/pixel

Orientation: 2.017 degrees

Field radius: 1.106 degrees


Resolution: 7500x4964

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This object, also known as Lower’s Nebula, is an emission nebula located 6000 light years away in the constellation of Orion at a declination of +16 degrees. This nebula spans 1 degree in our apparent view, which corresponds to a width of about 100 light years.

This nebula was one of the last large and bright deep sky objects discovered by amateur astronomers. The large reddish outer portion indicates hydrogen gas and is the object that was discovered by Harold Lower and his son Charles, in 1939.

The interesting small feature at nebula center looks a bit like an upside-down mushroom. I have not been able to find an explanation for this uniquely shaped object. The greenish center area corresponds to oxygen gas, so the mushroom-shaped gas "bubble" could be due to a recent large emission of oxygen from an unseen star. There is some question whether the large star which appears to lie in the center of the bubble is just in the foreground or is associated with the bubble itself.

Comments

Revisions

  • Final
    Sh2-261, 



    
        

            Gary Imm
    Original
  • Sh2-261, 



    
        

            Gary Imm
    E

E

Description: Mouseover

Uploaded: ...

Sky plot

Sky plot

Histogram

Sh2-261, 



    
        

            Gary Imm