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The Crab expands over 41 years, 



The Crab expands over 41 years

Technical card

Imaging telescope or lens:Planewave Instruments 24" CDK

Imaging camera:SBIG STX KAF-16803

Guiding telescope or lens:Planewave Instruments 24" CDK

Guiding camera:SBIG STX KAF-16803

Software:MaximDL 5

Filter:Baader Luminance

Resolution: 920x1080

Dates:Nov. 29, 2014

Frames: 21x300"

Integration: 1.8 hours

Avg. Moon age: 7.45 days

Avg. Moon phase: 50.77% job: 1251735

Locations: driveway, Daytona Beach, FL, United States


This is a blink comparison between my Crab nebula image taken a couple of years ago (also available on astrobin), and an M1 image from 1973 taken by Bill Schoening [NOAO] using the Kitt Peak 4-meter. The expansion of the nebula over the 41 years is evident, and the proper motion of several stars is also visible. My image was taken over a couple of nights of good seeing, with a net FWHM in the combined frames of ~1.3 arcsec. A gamma stretch was applied in Maxim, no sharpening or deconvolution.

The NOAO image can be found at []

The image overlay was done by my colleague Damon Burke.



License: None (All rights reserved)


The Crab expands over 41 years,