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Gallery: Hartley 2

Image taken by Elizabeth Warner
Processing by Nick Howes

Fig 1:

Image Parameter Details
Image Date (UTC): 2010-10-02/03
Image Time (UTC): 23:50
Exposure: 30 x 60 sec LRGB
Filter: LRGB
Field of View: ~50'x33'
Observing Site: College Park, MD
Observing Equipment: AP 152mm refractor on AP900
ST10 (-5°C)
Digital Processing: Nick's comments on processing
I didn't use the calibration bias or darks, but the rest is all there. Had to debloom the stars (SBIGS don't have AGB CCD's)

I used 30 images in each band, combined as LRGB in Maxim DL, first pass on the star field with a correlation stack, and then colour combine.

Then I used 30 images in RGB bands on the comet nucleus, tracking on that, using a median combine, which removes the stars (trails)

Then the two were merged

Then I ran a rotational gradient process on the L and R bands this brought out the "tail" which was then composited into the master image and blurred to remove the speckles which appear when you do that

Then, adjusted white and black points, and colour adjusted the comet based on straight RGB images

And that was a quick n dirty process, if I had more time, it would be better!

Table 1: Data about image.

Updated: 30-Jul-2013