Hemisphere:  Northern  ·  Contains:  Crab nebula  ·  M 1  ·  NGC 1952
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Messier 1: The Crab Nebula, 


            John Michael Bell...
Messier 1: The Crab Nebula
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Technical card

Imaging telescopes or lenses: Orion 8" f/3.9 Newtonian Astrograph

Imaging cameras: ZWO ASI 178MC-Cool

Mounts: Orion Atlas EQ-G

Guiding telescopes or lenses: Astromania 60mm Guidescope

Guiding cameras: ZWO ASI 120 MC-S

Focal reducers: Baader Mark-III MPCC Coma Corrector

Software: Gradient Exterminator GradientXTerminator  ·  Adobe Phosotshop CC 2018  ·  ProDigital Software Astronomy Tools Actions Set  ·  Stellarium  ·  DeepSkyStacker  ·  PHD2 PHD 2.6.5  ·  PPIP v2.5.4  ·  STARIZONA PS ACTION SET  ·  Russell Croman Star Shrink  ·  ZWO Designs ASICAP

Filters: Optolong L-eNhance 2"

Accessory: Telrad Finder

Dates:Oct. 4, 2019

Frames:Optolong L-eNhance 2": 70x200" (gain: 150.00) -15C bin 1x1

Integration: 3.9 hours

Darks: ~40

Bias: ~300

Avg. Moon age: 6.22 days

Avg. Moon phase: 37.79%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details

Astrometry.net job: 2969273

RA center: 5h 34' 27"

DEC center: +21° 59' 38"

Pixel scale: 0.183 arcsec/pixel

Orientation: 90.704 degrees

Field radius: 0.278 degrees

Resolution: 1824x1262

Locations: Backyard, Tucson, Arizona, United States

Data source: Backyard


Hey there again,
Took a crack at M1 finally. Last time I did was over a year ago. J thought it would be a perfect place to to start a lesson on Messier objects on my Instagram page. The details in the remnant came out great, the black sky.... not so much. This was largely do to my lack of dithering. I've been using ASICAP for my acquisition, unfortunately it doesn't have a feature to auto dither. So unless I get up every 30 min and do it manually I get vertical streaks in my background. Any suggestion for a capture program that works for you guys?



John Michael Bell...
License: Attribution Creative Commons

Sky plot

Sky plot


Messier 1: The Crab Nebula, 


            John Michael Bell...