Hemisphere:  Northern  ·  Constellation: Taurus (Tau)  ·  Contains:  Crab nebula  ·  M 1  ·  NGC 1952
M1 Crab Nebula, 



    
        

            Craig Gardiner
M1 Crab Nebula
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M1 Crab Nebula

Technical card

Imaging telescopes or lenses: Skywatcher 200P

Imaging cameras: Canon 350D Baader modified

Mounts: SkyWatcher HEQ5 PRO

Guiding telescopes or lenses: Skywatcher 9x50 Finder

Guiding cameras: QHYCCD 5L-II M

Focal reducers: Skywatcher 0.9x Coma Corrector

Software: Anat iAstroHub  ·  Nebulosity 4

Filters: IDAS LPS-P2 2"


Dates:Feb. 10, 2016

Frames: 27x91"

Integration: 0.7 hours

Avg. Moon age: 2.08 days

Avg. Moon phase: 4.83%


Basic astrometry details

Astrometry.net job: 957293

RA center: 5h 34' 33"

DEC center: +22° 1' 15"

Pixel scale: 1.454 arcsec/pixel

Orientation: -107.048 degrees

Field radius: 0.290 degrees


Resolution: 620x435

Locations: Back Garden, Ferndown, Dorset, United Kingdom

Data source: Backyard

Description

Taken during an unexpectedly clear night, temperature was 2-3 Deg C. Took around 60x 91 sec exposures, but lost a lot of detail towards the end due to dew, I think. Flicking through the images I can see the histogram peak moving towards the left edge for the last 30 or so images. Strangely this seems to be after a meridian flip. I stopped after about 30 shots because I was concerned that the focuser has slipped. I repositioned to Capella and checked focus using a bahtinov mask, but it turned out to look OK. When repositioning to M1 the mount moved to the east side of the mount. All subsequent images looked poor. I can only assume it was due related, but not sure why after this it changed. I just received a light panel for flats, but managed to move the focusses by accident before getting a chance to use it, so no flats. Since this is fairly cropped, vignetting shouldn't matter anyway. Still lots to learn.

Processed using Nebulosity 4 on Mac. I subtracted the bias from the darks, stacked the bias subtracted darks, then applied these and stacked bias to the lights.

Comments

Revisions

  • M1 Crab Nebula, 



    
        

            Craig Gardiner
    Original
  • Final
    M1 Crab Nebula, 



    
        

            Craig Gardiner
    B

Sky plot

Sky plot

Histogram

M1 Crab Nebula, 



    
        

            Craig Gardiner