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Contains:  NGC 3628, M 66, NGC 3627, M 65, NGC 3623, The star 73Leo
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The Leo Triplet, 


            Randal Healey
The Leo Triplet

The Leo Triplet

Technical card

Resolution: 3211x2373

Dates:April 20, 2018April 21, 2018April 22, 2018

Astrodon BLUE 36mm - Gen2 E-Series Tru-Balance: 20x300" -20C bin 1x1
Astrodon GREEN 36mm - Gen2 E-Series Tru-Balance: 19x300" -20C bin 1x1
Astrodon LUM 36mm - Gen2 E -Series Tru-Balance: 35x300" -20C bin 1x1
Astrodon RED 36mm - Gen2 E-Series Tru-Balance: 20x300" -20C bin 1x1

Integration: 7.8 hours

Darks: ~50

Flats: ~35

Flat darks: ~30

Bias: ~75

Avg. Moon age: 5.86 days

Avg. Moon phase: 34.36%

Bortle Dark-Sky Scale: 4.00 job: 2028482

RA center: 169.777 degrees

DEC center: 13.176 degrees

Pixel scale: 2.222 arcsec/pixel

Orientation: 16.425 degrees

Field radius: 1.232 degrees

Locations: Healey "Utahopia" Observatory, Kaysville, Utah, United States

Data source: Backyard


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 (Top), M66 (bottom), and M65 (Right). 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.



Randal Healey
License: None (All rights reserved)


  • The Leo Triplet, 


            Randal Healey
  • Final
    The Leo Triplet, 


            Randal Healey

Sky plot

Sky plot


The Leo Triplet, 


            Randal Healey