Three Open Clusters in Gemini ( sydney )

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: IC 2157 · M 35 · NGC 2158 · NGC 2168

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Three Open Clusters in Gemini

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Three Open Clusters in Gemini

Imaging Cameras: SBIG ST-10XME
Mounts: Astro-Physics 900GTO
Filters: Astrodon Gen2 I-Series Tru-Balance Blue 1.25" · Astrodon Gen2 I-Series Tru-Balance Green 1.25" · Astrodon Gen2 I-Series Tru-Balance Red 1.25"

Dates:: Feb. 15, 2023
Frames:: Astrodon Gen2 I-Series Tru-Balance Blue 1.25": 35×80″(46′ 40″) bin 1×1
Astrodon Gen2 I-Series Tru-Balance Green 1.25": 35×70″(40′ 50″) bin 1×1
Astrodon Gen2 I-Series Tru-Balance Red 1.25": 35×60″(35′) bin 1×1
Integration:: 2h 2′ 30″
Avg. Moon age:: 24.07 days
Avg. Moon phase:: 30.07%

Basic astrometry details

Astrometry.net job: 7225799

RA center: 06h07m25s.2

DEC center: +24°09′10″

Pixel scale: 2.636 arcsec/pixel

Orientation: 200.367 degrees

Field radius: 0.915 degrees

Resolution: 2114x1333

File size: 1.4 MB

Data source: Backyard

Three Open Clusters in Gemini

From left to right are open star clusters IC 2157, NGC 2158, and NGC 2168 (Messier 35). Like many people, the first time I saw NGC 2158 in a telescope I thought it was a comet. I was looking at M35 and noticed a soft fuzzy patch to the southwest. Higher magnification revealed it to be a collection of stars. It looks magnificent in a large aperture scope, even more impressive to me than M35. NGC 2158 is about five times more distant and ten times older than M35. It not only appears smaller, but also reveals a population of older and yellower stars as compared to M35’s younger hot blue stars. IC 2157 is a sparse cluster of young stars at a distance roughly midway between NGC 2158 and M35.

Red: 35 x 60s
Green: 35 x 70s
Blue 35 x 80s

I hope you enjoy!

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Basic success
Started	...
Astrometry.net job	7225799
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Three Open Clusters in Gemini

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