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 Constellation Guide GEMINI

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Posts : 116
Join date : 2011-08-23

PostSubject: Constellation Guide GEMINI   Fri Aug 26, 2011 5:23 pm

Gemini - The Twins

Pronounced "Jem - in - Eye"

Where to find the constellation

Constellation Chart

Gemini is another constellation where the majority of DSOs available to the beginner are open clusters. Quite a large 'zodiac' constellation, representing the mythological twin brothers, Castor and Pollux.

Brothers to Helen of Troy - apparantly the ancient Greek words 'kastor'
and 'Polludeukeis' mean literally 'beaver' and 'very sweet'

The star Castor is a tight double, a good test of amateur optics - Gemini also contains ngc2392, the 'Eskimo Nebula' a beautiful planetary neb - and M35, a fairly large populous open cluster, as well as many other open clusters of various sizes.

Nicely positioned high to the East during Winter and Spring - sweeping overhead, and eventually West, as the night progresses.


The only Messier object in Gemini, quite a rich open cluster, with two smaller open clusters nestled close-by (ngc2158 and Collinder 80)

Collinder 89

Quite large, but very sparsely populated open cluster - often overlooked due to it's proximity to the more well-known M35

Eskimo nebula - ngc2392

Beautiful planetary nebula, small, but fairly bright, and easy to find.

However, through an amateur scope, you won't see the colours, this is a more realistic view as seen through the eyepiece.

(I've added Saturn in there for a size comparison)


A multiple star system - 3 components are visible at the eyepiece (although there are more)

A and B components are a very tight double, only 3 arcseconds apart - a good test of the optics in a small scope is to 'split' these - you need to see black 'space' between the two components to have successfully split the double.

There's also a third, dim component, just over an arcminute away.

Gemini NGCs (with magnitudes) - from my own "1200 Northern NGCs" list

For those with 'GoTo' or a good chart.

2129 - OC - 6.7

2158 - OC - 8.6

2168 - OC - 5.1 (m35)

2331 - OC - 8.5

2339 - Gal - 11.7

2371 - PN - 13 - 2371 and 2372 are seperate parts

2372 - PN - 13 - of the same dim planetary nebula

2392 - PN - 8.6 (Eskimo nebula - surface brightness 6.7)

2395 - OC - 8

2420 - OC - 8.3
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PostSubject: Re: Constellation Guide GEMINI   Fri Aug 26, 2011 5:55 pm

Another great guide!!! Thanks for posting it - I look forward to using it!
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PostSubject: Re: Constellation Guide GEMINI   Fri Aug 26, 2011 5:55 pm

lookin GOOD!
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PostSubject: Re: Constellation Guide GEMINI   Fri Aug 26, 2011 5:55 pm

Again nicely done i do enjoy reading and looking through these guides keep it up mate.
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PostSubject: Re: Constellation Guide GEMINI   Fri Aug 26, 2011 5:57 pm

Looking very good! It's so detailed, really very helpful guide.
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