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Contains:  NGC 2477
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NGC 2477 Open Cluster in Sloan colors with EdgeHD11 f/7, 





    
        

            Freestar8n
NGC 2477 Open Cluster in Sloan colors with EdgeHD11 f/7

NGC 2477 Open Cluster in Sloan colors with EdgeHD11 f/7

Technical card

Resolution: 4656x3520

Dates:Feb. 10, 2019

Frames: 30x120"

Integration: 1.0 hours

Avg. Moon age: 5.06 days

Avg. Moon phase: 26.31%

Astrometry.net job: 2519714

RA center: 118.059 degrees

DEC center: -38.543 degrees

Pixel scale: 0.398 arcsec/pixel

Orientation: 279.920 degrees

Field radius: 0.322 degrees

Locations: Patio, Melbourne, Victoria, Australia

Data source: Backyard

Description

This is a nice southern open cluster, NGC 2477 taken with Sloan i' r' g' filters at f/7 with ASI1600. fwhm's in the stack are about 1.7" with a total of just under 1 hour exposure. 2m x 9 in each filter.

No processing or cropping other than levels, gradient removal, and slight color adjustment. Colors calibrated with foreground stars that have APASS sloan magnitudes in UCAC4.

You can see faint background galaxies throughout - and since no sharpening or smoothing has been applied the stars are more easily distinguished from smudgy galaxies.

At lower left is a side-on galaxy, PGC 22009

You can tell that the brighter stars are blue - but there are additional very bright orange stars. They are red giant branch (RGB) stars. This is a medium age cluster only about 1 billion years old.

A nice paper with details is:
https://www.aanda.org/articles/aa/abs/2004/31/aa0151-04/aa0151-04.html

You can see how the distribution of stars matches isochrones for 1 Gy age.

Comments

Author

Freestar8n
Freestar8n
License: None (All rights reserved)
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NGC 2477 Open Cluster in Sloan colors with EdgeHD11 f/7, 





    
        

            Freestar8n