M35 and NGC2158 (Jim Stevenson)

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

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M35 and NGC2158

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M35 and NGC2158

M35 and NGC2158 star clusters in the constellation Gemini. M35 is the more "spread out" one in this photo; It's ~3900 light years away and ~175 million years old. NGC2158 is the more tightly packed one and is much older and more distant - ~2 billion years old and ~11,000 light years away.

Hardcore Geek Stuff: Blue stars are hotter and more massive than yellow stars, and they burn out much faster. Therefore the younger M35 has lots more blue stars than the much older NGC2158 - the blue stars have all burned out of the latter, so it has a much "yellower" population, as is clearly visible in this photo.

Extra Credit Geek Stuff: In 1989 M35 was the first open cluster to have it's mass directly measured (approx 1600 times the mass of our sun) using a method that combines radial velocity (measured by doppler shift) and proper motion (using photographs taken many years apart). This method has become a standard for such measurements.

Tech stuff: AT6RC telescope, Canon 550D(a) camera, Orion Sirius mount, Baader Moon & Skyglow filter. 54x120s exposures processed with Astro Pixel Processor, Pixinsight and Photoshop. Captured 1/7/2021 from my backyard in Rhinebeck, NY.

Low-Cost Astrophotography
Ritchey Chretien telescopes GSO Family
Northeast Imagers

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Astrometry.net job	4139174
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M35 and NGC2158

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