Hemisphere:  Southern  ·  Constellation: Puppis (Pup)  ·  Contains:  NGC 2451  ·  c Pup
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NGC 2451, 



    
        

            Gary Imm
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NGC 2451

Getting plate-solving status, please wait...
NGC 2451, 



    
        

            Gary Imm
Powered byPixInsight

NGC 2451

Imaging telescopes or lenses: Orion EON 130mm ED Triplet APO

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Astro-Physics Mach1GTO

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: Orion StarShoot AutoGuider Pro Mono

Focal reducers: Orion 3" Field Flattener

Software: Main Sequence Software Sequence Generator Pro  ·  PixInsight  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:Jan. 30, 2018

Frames:
Astrodon Blue 31mm Gen2 I-Series: 60x10" (10') (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 60x10" (10') (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 60x10" (10') (gain: 139.00) -20C bin 1x1

Integration: 30'

Avg. Moon age: 13.54 days

Avg. Moon phase: 98.31%


Astrometry.net job: 1914407

RA center: 7h 45' 15"

DEC center: -37° 59' 20"

Pixel scale: 0.853 arcsec/pixel

Orientation: 30.462 degrees

Field radius: 0.654 degrees


Resolution: 4416x3316

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This object is a beautiful open cluster located 600 light years away in the southern constellation of Puppis. It is one of the earliest sky object discoveries, by Giovanni Battista Hodierna around 1650.

The brightest star in the center, 3.6 magnitude c Puppis, has been called many different colors by astronomers over the years, from very red, to orange, to yellow. It looks orange to me in this calibrated image.

Like many other open clusters, astronomers have debated whether this was truly a cluster or simply a collection of bright stars. In 1994, German astronomers Siegfried Roser and Ulrich Bastian determined that many of the bright stars with similar proper motion belonged to a cluster called the Puppis Moving Group (NGC 2451a). They also proposed, and it was later confirmed, that a second distant cluster (NGC 2451b) exists further away at 1200 light years along the same line of sight. I cannot see an indication of a distant cluster in this image.

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