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Old 12-03-2017, 09:02 AM
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SkyViking (Rolf)
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Cool Clusters Near and Far - Messier 35 and NGC 2158

Hi All,

Here is the second image from the new observatory.

Link to medium resolution image

Link to full resolution image (5MB)


About the image:
The contrasting open star clusters Messier 35 and NGC 2158 are located in the constellation Gemini. First discovered by the astronomer Philippe Loys de Chéseaux in 1745, it was later included by Charles Messier in his "Catalogue des Nébuleuses et des Amas d'Étoiles" ("Catalogue of Nebulae and Star Clusters"); the famous list of Messier objects.
Messier 35 in the upper left of the image is a nearby young star cluster, some 2800 light years distant and about 150 million years old. It covers an area of sky similar to that of the full Moon and contains approximately 2500 stars. Most are bright and blue, having not yet burned out their supply of Hydrogen.
Southwest of Messier 35, in the bottom right, lies NGC 2158 which is nearly four times more distant and contains many more stars. It is also much older, estimated to be some 2 billion years old. All its blue giant stars have burned out long ago and only the orange glow of its older stars remain. NGC 2158 was once though to be a globular cluster due to its compact nature.
Open star clusters are groups of stars that have formed from a single cloud of gas and dust at roughly the same time. Their individual stars are more or less bound to each other by gravity but may become dispersed over time as the cluster orbits through the plane of the Milky Way and interact with other clusters and clouds.

Image details:
Date: 19th February 2017
Exposure: LRGB: 75:25:25:25 mins, total 2 hours 30 mins @ -25C
Telescope: Homebuilt 12.5" f/4 Serrurier Truss Newtonian
Camera: QSI 683wsg with Lodestar guider
Filters: Astrodon LRGB E-Series Gen 2
Taken from my observatory in Auckland, New Zealand

Hope you enjoy. I have always had a soft spot for M 35 and its neighbour, having spent many hours looking at it as a kid using my little 60mm refractor when I lived in the Northern hemisphere. It is a great deep sky object to show others, as it is very unique with the arc of bright stars and the faint haze of NGC 2158 off to the side.

Regards,
Rolf
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Last edited by SkyViking; 12-03-2017 at 05:40 PM.
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Old 12-03-2017, 09:55 AM
Stevec35 (Steve)
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Nice shot Rolf. I've always liked M35 too but it's a bit too low for me. I would have thought it's challenging for you too give the trees around your old observatory. Perhaps you now have a good northern horizon now.

Cheers

Steve
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Old 12-03-2017, 11:28 AM
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RickS (Rick)
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Lovely colours and a very interesting contrast, Rolf.
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Old 12-03-2017, 01:42 PM
topheart
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Very nice composition!
Cheers,
Tim
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Old 12-03-2017, 04:01 PM
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This is plain & simply, a drop dead gorgeous, beautiful image.
The cluster on the left appears to be radiating and exploding out of the smaller one on the right, and the contrasting complementary colours of those stars are just wow!
One of the nicest cluster images out there imo, well done!
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Old 12-03-2017, 05:13 PM
Placidus (Mike and Trish)
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A wonderful choice of field, a beautiful presentation, and a very interesting discussion. A logical, meaningful, and artistic handling of colour.

Love it.
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Old 12-03-2017, 05:46 PM
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Atmos (Colin)
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Nicely Captured Rolf, must be nice to occasionally image something that can be both started and finished in one night
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Old 12-03-2017, 07:17 PM
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Nice image Rolf, the contrast between the clusters does make for an interesting image

Mike
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Old 16-03-2017, 10:17 PM
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Most beautiful image. Love the colours.
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Old 20-03-2017, 07:59 AM
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SkyViking (Rolf)
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Quote:
Originally Posted by Stevec35 View Post
Nice shot Rolf. I've always liked M35 too but it's a bit too low for me. I would have thought it's challenging for you too give the trees around your old observatory. Perhaps you now have a good northern horizon now.

Cheers

Steve
Thanks Steve, Canberra is 1.5 deg further north than Auckland so you clearly have an edge on this one! I did wonder about the low altitude, but took all the data near the meridian and didn't really notice a significant difference from other targets.
Yes, now my view towards N, E and SE is completely unobstructed, so am really excited about having access to some of these northern gems.


Quote:
Originally Posted by RickS View Post
Lovely colours and a very interesting contrast, Rolf.
Thank you Rick, it is certainly a contrasting pair

Quote:
Originally Posted by topheart View Post
Very nice composition!
Cheers,
Tim
Thanks Tim

Quote:
Originally Posted by Andy01 View Post
This is plain & simply, a drop dead gorgeous, beautiful image.
The cluster on the left appears to be radiating and exploding out of the smaller one on the right, and the contrasting complementary colours of those stars are just wow!
One of the nicest cluster images out there imo, well done!
Thank you very much Andy, I think it turned out nice too and clusters deserve some attention every now and then!

Quote:
Originally Posted by Placidus View Post
A wonderful choice of field, a beautiful presentation, and a very interesting discussion. A logical, meaningful, and artistic handling of colour.

Love it.
Thanks a lot Mike and Trish, I was particularly pleased with the colour difference between these clusters.

Quote:
Originally Posted by Atmos View Post
Nicely Captured Rolf, must be nice to occasionally image something that can be both started and finished in one night
Thanks Colin, yes that's true!

Quote:
Originally Posted by strongmanmike View Post
Nice image Rolf, the contrast between the clusters does make for an interesting image

Mike
Thank you Mike!

Quote:
Originally Posted by cometcatcher View Post
Most beautiful image. Love the colours.
Thanks Kevin!
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  #11  
Old 20-03-2017, 08:24 PM
DJT (David)
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Lovely image, Rolf. As others have said its a really well framed image showing the contrast between the old and the new and I do like a good cluster.

Top job
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