Hemisphere:  Southern  ·  Constellation: Puppis (Pup)  ·  Contains:  NGC 2451  ·  NGC 2477
NGC 2477 & 2451 - A Pair of Star Clusters in Puppis, 



    
        

            Ray Caro
NGC 2477 & 2451 - A Pair of Star Clusters in Puppis
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NGC 2477 & 2451 - A Pair of Star Clusters in Puppis

NGC 2477 & 2451 - A Pair of Star Clusters in Puppis, 



    
        

            Ray Caro
NGC 2477 & 2451 - A Pair of Star Clusters in Puppis
Powered byPixInsight

NGC 2477 & 2451 - A Pair of Star Clusters in Puppis

Technical card

Imaging telescopes or lenses: APM 107/700

Imaging cameras: Sony A7s

Mounts: iOptron iEQ45 Pro

Focal reducers: Riccardi Flattener 1.0x

Software: Photoshop CS6  ·  DeepSky Stacker (DSS) Deepskystacker 3.3.6

Filters: Astronomik H-alpha 12nm CCD Clip-Filter Sony


Dates:March 10, 2018

Frames:
168x30" (1h 24') ISO3200
Astronomik H-alpha 12nm CCD Clip-Filter Sony: 90x30" (45') ISO3200

Integration: 2h 9'

Avg. Moon age: 23.05 days

Avg. Moon phase: 40.51%


Basic astrometry details

Astrometry.net job: 1984634

RA center: 7h 48' 36"

DEC center: -38° 9' 57"

Pixel scale: 2.412 arcsec/pixel

Orientation: 7.340 degrees

Field radius: 1.495 degrees


Resolution: 3712x2476

Description

Here is a beautiful pair of star clusters visible especially from the southern hemisphere.

It is located in a rich area of the Milky Way with a few gas clouds that the Ha filter I used could bring out. Processing in RHaGB...

NGC 2451 is a very special remarkable object.

Indeed, considered for a long time as a single cluster, NGC 2451 has finally been listed in A and B because of its dual nature. The hypothesis of two clusters located in the same line of sight, one at 600 and the other at 1200 light-years of our system, was issued very recently, in 1994. After X-ray observations and photometric, among others, its double nature was confirmed.

NGC 2451 has about forty stars, the most brilliant, HD 63032 (c Puppis), an orange giant, dominating the whole.

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NGC 2477 is still special. Its stars are clustered so compact that one could think of dealing with a globular cluster, but without the central density.

Some observers rank it in the top ten of the most beautiful open clusters.

NGC 2477 was discovered by Nicolas de Lacaille in 1751. Distant 3600 light years from our system, it has about 300 stars of an estimated 700 million years.

Comments

Sky plot

Sky plot

Histogram

NGC 2477 & 2451 - A Pair of Star Clusters in Puppis, 



    
        

            Ray Caro