Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  NGC 2371  ·  NGC2371  ·  NGC2372  ·  PK189+19.1
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NGC 2371, 


            Gary Imm
NGC 2371, 


            Gary Imm

NGC 2371

Imaging telescopes or lenses: Celestron EdgeHD 11

Imaging cameras: ZWO ASI 294 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: Astrodon Ha 31mm 5nm  ·  Astrodon OIII 31mm 3nm  ·  Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW 2″X7  ·  Celestron OAG  ·  MoonLite Focuser for EdgeHD 11

Dates:Jan. 23, 2021Jan. 24, 2021Jan. 25, 2021

Astrodon Blue 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2
Astrodon Green 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2
Astrodon Ha 31mm 5nm: 24x300" (gain: 200.00) -20C bin 2x2
Astrodon OIII 31mm 3nm: 24x300" (gain: 200.00) -20C bin 2x2
Astrodon Red 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2

Integration: 7.0 hours

Avg. Moon age: 10.62 days

Avg. Moon phase: 81.36%

Astrometry.net job: 4260318

RA center: 7h 25' 34"

DEC center: +29° 29' 30"

Pixel scale: 0.343 arcsec/pixel

Orientation: -2.676 degrees

Field radius: 0.149 degrees

Resolution: 2524x1834

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

Data source: Backyard


This object is a planetary nebula located 5000 light years away in the constellation of Gemini at a declination of +29 degrees. This magnitude 12.8 PN spans over 2 arc-minutes to the outer lobes in our apparent view, which corresponds to a diameter of 3.2 light years. PN usually span about 1 light year – this object is one of the largest known PNs.

The central bright region is a torus of illuminated dusk surrounding has the central star, with a dark lane of cleared out material running along the bi-polar jet axis. In an eyepiece, this object looks like two bright “halves” separated by a dark area. This appearance led to this object having two entries in the New General Catalogue NGC 2371 & NGC 2372.

The nebulas 14.8 magnitude blue central star is easily visible. Far out from the central star, beyond the bright inner region, are two faint filamentary features, one on each side. These features likely represent the outer shells of the bi-lobed structure and are illuminated by the ultraviolet light that sneaks out through the dark dust lane along the bi-polar axis.

Looking closely at my image, two small bright white “arrowheads” are visible on opposite sides of the central star, pointing outward. These are likely to be cool, dense knots of gas ejected from the central star. These knots are called "FLIERS," which stand for Fast Low-Ionization Emission Regions. The FLIERS are easier to see in the Hubble and Spitzer images of the mouseover, colored pink and red respectively. My Astrobin catalog of FLIERS is here.

It is interesting that the direction of these FLIERS is not aligned with the bi-polar axis. Scientists believe that is because the bi-polar jets are changing direction over time, but clearly there is a long way to go before objects like this one are fully understood.



  • Final
    NGC 2371, 


            Gary Imm
  • NGC 2371, 


            Gary Imm


Description: Comparison to Hubble and Spitzer Space Telescope Images

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Sky plot

Sky plot


NGC 2371, 


            Gary Imm