Re: NGC 2153 image
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Bruce,
That's a real beauty. I am very fond of star cluster with their different star colours, which you have presented so beautifully here. It looks like a rich sprinkling of diamonds, with yellow and blue sapphires on black velvet.
Geof
From: [email protected] <[email protected]> on behalf of bw via groups.io <bw_msg01@...>
Sent: 19 February 2025 17:45 To: [email protected] <[email protected]> Subject: [QSI-CCD] NGC 2153 image ?
This is an image of NGC 2158, a dense open cluster that could be imaged in a short amount of time during tough winter conditions in New Mexico.???
Once thought to be a globular cluster because of its size and density, it is now known to be an intermediate-age, metal-poor open cluster that is a member of the old thin disk population.?
Most open clusters are disrupted by tidal forces in only a few million years yet this cluster is thought to be nearly 2B years old.?
As a result, its original hot blue stars have evolved off the main sequence?
leaving behind a redder population of stars.? The target was imaged during 3 nights in the period from Dec 2024 to Feb 2025 using a 12.5" PlaneWave scope and a QSI-640ws camera at f/8 from SkyPi?
Remote Observatories.? Total LRGB integration was a short 5 hours.
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Thanks for looking,
Bruce W.
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Geof Lewis