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Contains:  NGC 3628, M 66, NGC 3627, M 65, NGC 3623
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The Triplets in Leo, 


            Randal Healey
The Triplets in Leo

The Triplets in Leo

Technical card

Resolution: 2982x2249

Dates:April 8, 2019April 9, 2019April 10, 2019

Astrodon BLUE 36mm - Gen2 E-Series Tru-Balance: 17x600" -20C bin 1x1
Astrodon GREEN 36mm - Gen2 E-Series Tru-Balance: 19x600" 20C bin 1x1
Astrodon LUM 36mm - Gen2 E -Series Tru-Balance: 16x180" -20C bin 1x1
Astrodon RED 36mm - Gen2 E-Series Tru-Balance: 18x600" -20C bin 1x1

Integration: 9.8 hours

Darks: ~50

Flats: ~50

Bias: ~100

Avg. Moon age: 4.00 days

Avg. Moon phase: 17.54% job: 2642603

RA center: 169.932 degrees

DEC center: 13.277 degrees

Pixel scale: 1.573 arcsec/pixel

Orientation: 191.047 degrees

Field radius: 0.816 degrees

Data source: Own remote observatory


I thought I would give this famous group another try with my 103mm refractor.

This group is popular in the northern spring. Famous as the Leo Triplet, the three magnificent galaxies gather in one field of view. they can be introduced individually as NGC 3628, M66, and M65. All three are large spiral galaxies but they tend to look dissimilar because their galactic disks are tilted at different angles to our line of sight. NGC 3628 is seen edge-on, with obscuring dust lanes cutting across the plane of the galaxy, while the disks of M66 and M65 are both inclined enough to show off their spiral structure. Gravitational interactions between galaxies in the group have also left telltale signs, including the warped and inflated disk of NGC 3628 and the drawn out spiral arms of M66. This region spans about one degree (two full moons) on the sky. The field covers over 500 thousand light-years at the trio's estimated distance of 30 million light-years. I hope you enjoy.



Randal Healey
License: None (All rights reserved)


  • The Triplets in Leo, 


            Randal Healey
  • Final
    The Triplets in Leo, 


            Randal Healey

Sky plot

Sky plot


The Triplets in Leo, 


            Randal Healey