Hemisphere:  Southern  ·  Constellation: Lepus (Lep)  ·  Contains:  PGC16611  ·  PGC905996  ·  PGC913021  ·  PK215-30.1
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Abell 7, 


            Gary Imm
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Abell 7

Getting plate-solving status, please wait...
Abell 7, 


            Gary Imm
Powered byPixInsight

Abell 7

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 1600MM Cooled Pro

Mounts: Astro-Physics Mach1GTO

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: Orion StarShoot AutoGuider Pro Mono

Software: Main Sequence Software Sequence Generator Pro  ·  PixInsight  ·  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  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control

Dates:Jan. 13, 2019Jan. 14, 2019

Astrodon Blue 31mm Gen2 I-Series: 60x30" (30') (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 60x30" (30') (gain: 139.00) -20C bin 1x1
Astrodon Ha 31mm 5nm: 30x300" (2h 30') (gain: 300.00) -20C bin 1x1
Astrodon OIII 31mm 3nm: 30x300" (2h 30') (gain: 300.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 60x30" (30') (gain: 139.00) -20C bin 1x1

Integration: 6h 30'

Avg. Moon age: 7.13 days

Avg. Moon phase: 47.35%

Astrometry.net job: 2499327

RA center: 5h 3' 7"

DEC center: -15° 36' 29"

Pixel scale: 0.783 arcsec/pixel

Orientation: -141.612 degrees

Field radius: 0.431 degrees

Resolution: 3176x2375

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

Data source: Backyard


This object is a very faint planetary nebula located 1,800 light-years away in the southern constellation of Lepus. The nebula is 8 light years in diameter. The central star (WD 0500-156) is the faint bluish star in the center of the nebula.

This a tough one to image and process. It is one of the few planetary nebula for which the outer extent of the nebula (usually a sphericial shape) does not stand out well. The brightest part of the nebula are numerous reddish Ha regions located in the inner part of the nebula. These Ha regions appear to me to be the result of polar outflows, since they are brightest on opposite sides of the nebula. The cyan OIII region is not spherical but more of an oval shape, which is unusual. Interestingly, this object is the largest planetary nebula which is not interacting with the surrounding interstellar medium.

Several faint distant galaxies provides a nice backdrop for the nebula. The galaxy on the left is PGC16611. The galaxies on the right are harder to see and even harder to identify. Astrobin identifies an object on the right as IC 400, but most experts believe that this object is simply a star. The "real" IC 400 is probably a bit further right, one of the two tiny faint galaxies seen in the full resolution view. The 16th magnitude spindle galaxy is 6dFGS gJ050345.6-154909, located 160 million light years away. Just above it, partially hidden by a star, is 17th magnitude galaxy PGC 905996, located over 400 million light years away.