Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  Solar system body or event
Comet Leonard and M3, Behnam Darvish

Comet Leonard and M3

Comet Leonard and M3, Behnam Darvish

Comet Leonard and M3

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Description

What a cold morning it was! 

I took  a total of 2h40m integration but only used 2 hours of the data as the first 40 mins were not good (bad seeing and LA's light pollution as expected.). Ambient temperature was 28 F-27 F throughout but that really helped a lot in terms of noise level in my subs. 

The shown image is a cutout made from a 61*120sec stack. I used DSS to first register/stack stars as I normally do using the middle sub exposure as the reference frame. Then I used the DSS's comet mode and stacked the comet using the same reference frame. In both cases, I used median sigma clipping to get rid of much of the moving object/objects in each case (comet or stars). However, there is still some artifact/residual left behind than you can see in the faint tail of the comet for instance if you look carefully. Finally, I merged both stacks together in GIMP.

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Comet Leonard and M3, Behnam Darvish