Hemisphere:  Southern  ·  Constellation: Puppis (Pup)  ·  Contains:  140 Pup  ·  M 46  ·  M46  ·  NGC 2437  ·  NGC 2438  ·  NGC2438  ·  PK231+04.1  ·  PK231+04.2
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M46 Open Cluster in  constellation of Puppis, 



    
        

            Gebhard Maurer
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M46 Open Cluster in constellation of Puppis

Getting plate-solving status, please wait...
M46 Open Cluster in  constellation of Puppis, 



    
        

            Gebhard Maurer
Powered byPixInsight

M46 Open Cluster in constellation of Puppis

Technical card

Imaging telescopes or lenses: Skywatcher Newton 200/1000 PDS

Imaging cameras: Canon EOS 600Da

Mounts: Skywatcher AZ-EQ6 Pro

Guiding telescopes or lenses: Lacerta MGEN2-Autoguider with 9x50 Finder Scope

Software: PixInsight PixInsinght 1.8

Filters: Hutech IDAS LPS D1 2"


Dates:Jan. 12, 2020

Frames:Hutech IDAS LPS D1 2": 94x60" ISO800

Integration: 1.6 hours

Darks: ~50

Bias: ~50

Avg. Moon age: 16.61 days

Avg. Moon phase: 96.20%

Bortle Dark-Sky Scale: 4.00


Astrometry.net job: 3408160

RA center: 7h 41' 34"

DEC center: -14° 46' 55"

Pixel scale: 0.884 arcsec/pixel

Orientation: -89.644 degrees

Field radius: 0.702 degrees


Resolution: 4832x3057

Locations: Backyard, Raglitz, Niederösterreich, Austria

Data source: Traveller

Description

Messier 46, also known as NGC 2437, is an open cluster of stars in the constellation of Puppis. It was discovered by Charles Messier in 1771. Dreyer described it as "very bright, very rich, very large." M46 is about 4,920 light-years away. There are an estimated 500 stars in the cluster with a combined mass of 453 M☉,[2] and it is thought to be some 251.2 million years old.

The cluster has a tidal radius of 37.8 ± 4.6 ly and a core radius of 8.5 ± 1.3 ly. It has a greater spatial extend in the infrared than in visible light, suggesting that the cluster is undergoing some mass segregation with the fainter (redder) stars migrating to a coma region. The fainter stars that extend out to the south and west may form a tidal tail due to a past interaction.

The planetary nebula NGC 2438 appears to lie within the cluster near its northern edge (the faint smudge at the top center of the image), but it is most likely unrelated since it does not share the cluster's radial velocity. It is an example of a superimposed pair possibly similar to that of NGC 2818. On the other hand, the illuminating star of the bipolar Calabash Nebula shares the radial velocity and proper motion of Messier 46, and is at the same distance, so is a bona fide member of the open cluster.

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M46 Open Cluster in  constellation of Puppis, 



    
        

            Gebhard Maurer