Hemisphere:  Northern  ·  Contains:  32 alf Leo  ·  IC591  ·  Regulus  ·  The star Regulus (αLeo)
Getting plate-solving status, please wait...
Regulus in Leo, 


            Matt Harbison
Powered byPixInsight

Regulus in Leo

Imaging telescopes or lenses: William Optics FLT 132 Triplet APO WOFLT132

Imaging cameras: QHY 16200A

Mounts: Astro-Physics Mach 1 GTO

Guiding telescopes or lenses: William Optics FLT 132 Triplet APO WOFLT132

Guiding cameras: QHY-5-L-II-M QHY5-II Mono

Focal reducers: William Optics Reducer WO 0.80 #1

Software: PixInsight  ·  Adobe Photoshop photoshop PS  ·  Sequence Generator Pro  ·  Adobe Lightroom LR

Filters: Astrodon Tru-Balance LRGB E-Series Gen 2

Accessory: QHY Med OAG QHYOAG-M  ·  Moonlite DRO focuser&rotator Moonlite DRO Focuser & Rotator  ·  Optec Alnitak Flip-Flat Flat Fielder

Dates:April 1, 2019

Frames:Astrodon Tru-Balance LRGB E-Series Gen 2: 100x120" -12C bin 1x1

Integration: 3.3 hours

Darks: ~100

Flats: ~100

Bias: ~100

Avg. Moon age: 26.01 days

Avg. Moon phase: 13.39%

Bortle Dark-Sky Scale: 2.00

Astrometry.net job: 3527180

RA center: 10h 8' 20"

DEC center: +11° 58' 10"

Pixel scale: 1.660 arcsec/pixel

Orientation: 177.092 degrees

Field radius: 1.093 degrees

Resolution: 4021x2513

Locations: Marathon Motel, Marathon Motel, TX, United States; MaRIO, Marathon, Texas, None

Data source: Own remote observatory

Remote source: Marathon Remote Imaging Observatory (MaRIO)


Regulus (the star) in the constellation Leo is accompanied in view by the galaxy UGC 5470. This tiny blue fuzz you see is a dwarf galaxy- Leo 1 or UGC5470/PGC 29488, and is sometimes called the "Regulus Dwarf".

Regulus, while being a blue/white main sequence star like our own, rotates rapidly taking only 15-16 earth hours to complete a rotation. This increased rotation and it's size (and possibly other forces unknown to me) have caused it to become almost egg-shaped. While filling my cameras sensor, appearing to be one star, it is actually at least a quadruple system with four stars in it's grasp. It is roughly 3.5 times the size of Sol and has a luminosity of 240 times more. It is 77.5 light years from the Earth.

I first observed this star in the spring of 2017 with my friends and fellow Barnard Astronomical Society of Chattanooga members, Ralph McConnell and Harold Harris while participating in one of Ralph's monthly star hopping challenges from the Barnard Astronomical Society of Chattanooga’s monthly newsletter. I've just now gotten around to turning the camera on it for a few months.

Captured in Marathon, Texas at MARIO Telescopes LLC.



Matt Harbison
License: None (All rights reserved)

Sky plot

Sky plot


Regulus in Leo, 


            Matt Harbison