Hemisphere:  Northern  ·  Contains:  M 65  ·  M 66  ·  NGC 3593  ·  NGC 3623  ·  NGC 3627  ·  NGC 3628  ·  The star 73Leo
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Leo's triplet, 


            Boutros el Naqqash
Leo's triplet
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Leo's triplet

Technical card

Imaging telescopes or lenses: Skywatcher 80/400 ESPRIT Triplet-APO

Imaging cameras: Canon T3i modded

Mounts: Skywatcher HEQ5 Pro Synscan

Guiding cameras: Orion StarShoot AutoGuider Orion SSAG w/50mm Guidescope

Focal reducers: Sky-Watcher Esprit 80 FF Field Flattener

Software: PixInsight 1.8 Pisinsight 1.8  ·  Adobe Photoshop Elements 11

Filters: IDAS LPS P2 Light Pollution Filter (2")

Accessory: Orion Starshoot Autoguider and guide scope Orion Starshoot Autoguider and guide scope

Dates:April 4, 2016

Frames: 72x90"

Integration: 1.8 hours

Avg. Moon age: 26.12 days

Avg. Moon phase: 12.57%

Basic astrometry details

Astrometry.net job: 1853907

RA center: 11h 18' 53"

DEC center: +12° 55' 4"

Pixel scale: 2.163 arcsec/pixel

Orientation: 31.860 degrees

Field radius: 1.464 degrees

Resolution: 4056x2704

Locations: Site de la Rosette, Hemmingford, Quebec, Canada


The Canon T3i sometimes gathers more noise than proper signal... Even though it was decently cold (-5C). So much that PI tools (TGV, ACDNR, MLT, etc) seem to be of no use as default values yield negligible improvement and forcing the parameters generates science fiction artefacts

So, just like Markarian's chain, this image is heavily processed (ahum ahum).

Short exposures as I did not guide (some kind of PC problem). And I assume my PA was so and so....

Wide angles are very nice. But do show limitations. Not sure 400mm focal length is ideal for this target. A full frame sensor with 600mm FL would probably give nicer results

(And thanks Ruben for pointing out that the first version was very bluish. I do love the blue but I admit it was exgerated :-). I straightened out the histogram somewhat)



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Leo's triplet, 


            Boutros el Naqqash