Hemisphere:  Southern  ·  Constellation: Vela (Vel)  ·  Contains:  NGC 2736  ·  NGC2736  ·  PK266+00.1  ·  PK266-00.1  ·  Pencil Nebula
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NGC 2736, 


            Gary Imm
NGC 2736, 


            Gary Imm

NGC 2736

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: Pixinsight  ·  Main Sequence Software Sequence Generator Pro  ·  Stark Labs PHD2 2.6.3

Filters: Chroma OIII 3nm  ·  Chroma SII 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:Dec. 5, 2020Dec. 6, 2020Dec. 7, 2020Dec. 8, 2020

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: 100.00) -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: 21.11 days

Avg. Moon phase: 60.68%

Astrometry.net job: 4134501

RA center: 9h 0' 14"

DEC center: -45° 57' 27"

Pixel scale: 1.552 arcsec/pixel

Orientation: 2.759 degrees

Field radius: 0.984 degrees

Resolution: 3720x2644

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

Data source: Backyard


This object is a supernova remnant located 800 light years away in the southern constellation of Vela at a declination of -46 degrees. The primary portion of this SNR spans 14 arc-minutes in our apparent view, which corresponds to a diameter of 3 light years. This SNR is a small part of the amazing Vela supernova remnant.

The bright arcs of this SNR are unusually straight compared to most other nebula. The oxygen gas is dominant on the structure edge, while the hydrogen gas is dominant in the interior. Surrounding the bright nebula, faint signal fills the entire frame.

NGC 2736 is sometimes nicknamed Herschel’s Ray after its discoverer, John Herschel, who described it as “an extraordinary long narrow ray of excessively feeble light”. It is also nicknamed the Pencil Nebula by someone with a similar lack of imagination to me.

From my imaging location, this object only rises 13 degrees above the horizon, resulting in a somewhat blurry image because of atmospheric distortion as well as inferior tracking performance.



  • Final
    NGC 2736, 


            Gary Imm
  • NGC 2736, 


            Gary Imm


Description: Astrobin Mouseover

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Sky plot

Sky plot


NGC 2736, 


            Gary Imm