elpajare
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Post by elpajare on Jul 6, 2017 9:00:53 GMT
Palomar 11 is a 9th magnitude Globular Cluster appearing in the constellation Aquila. It is 44 thousand light years from our solar system. Palomar 11's apparent size is approximately 10.0 arcminutes, corresponding to a physical diameter of 127 light years. SKYWATCHER 200/800+Infinity+Infinity software+ Moon at 75%
10x15" stack
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Post by ChrisV on Jul 7, 2017 0:02:26 GMT
Thats really nice carlos. I should look at everyone's images on a computer more often. I usually look at the images on my phone and can't see much - need a bigger phone or better glasses
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elpajare
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Post by elpajare on Jul 7, 2017 7:07:46 GMT
This is my problem too. Because it, I moved to a big laptop wit a full color screen.
I expend a lot of hours in visual a couple of years ago but my eyes become old and a clear and bright screen is better now.
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giorgosgr
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The stars at night are big and bright!
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Post by giorgosgr on Jul 11, 2017 20:45:14 GMT
Excellent pic elpajare! By coincidence I also shoot Palomar 11 with my cctv camera + Skywatcher 102/500 refractor during the night of 1-2/7. Yours is far better / deeper! Seems that Infinity + 200/800 rock!
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Post by Dragon Man on Jul 12, 2017 9:25:49 GMT
It's a tiny cluster. Good attempt Giorgo. I find it hard to understand why they designate it as a 'Globular' cluster. There's nothing really 'Globular' about it. It looks more like an open cluster. cs.astronomy.com/asy/m/starclusters/491187.aspx
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giorgosgr
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The stars at night are big and bright!
Posts: 37
time zone gmt +/-: +2
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Post by giorgosgr on Jul 12, 2017 10:56:06 GMT
Ken, globular clusters are identified by their H-R diagrams neither by the density of stars nor their spherical shape. Shape and number of stars can be misleading. Once M71 was considered by some astronomers as a dense open cluster today it is classified as a globular cluster. E. J. Hartung in "Astronomical objects for southern telescopes" refers to NGC158 next to M35 in Gemini as "globular cluster". Nowadays it is classified as a dense open cluster instead.
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Post by Dragon Man on Jul 12, 2017 12:08:25 GMT
Ken, globular clusters are identified by their H-R diagrams neither by the density of stars nor their spherical shape. Shape and number of stars can be misleading. Once M71 was considered by some astronomers as a dense open cluster today it is classified as a globular cluster. E. J. Hartung in "Astronomical objects for southern telescopes" refers to NGC158 next to M35 in Gemini as "globular cluster". Nowadays it is classified as a dense open cluster instead. Very confusing LOL! Sometimes I think the IAU (International Astronomical Union) make things up and change things just to justify their existence To make things more confusing, they think Omega centauri may actually be the core of a Dwarf Galaxy, not a Globular Cluster
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giorgosgr
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The stars at night are big and bright!
Posts: 37
time zone gmt +/-: +2
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Post by giorgosgr on Jul 12, 2017 13:38:24 GMT
According to some theories globular clusters are failed galaxies... NGC2158 (not NGC158, my error). M54 is considered by some astronomers to be the the nucleus of Sagittarius Dwarf consumed by the Milky Way. As a matter of fact the H-R diagram shows different astrophysical characteristics of the open clusters that are very young objects from the globular clusters that are very old. Here there are some H-R diagrams of both globular and open clusters. The difference is obvious.
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elpajare
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Post by elpajare on Jul 13, 2017 6:44:53 GMT
Very interesting remarks, Giorgo.
Now I understand difference. Thanks.
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Jul 13, 2017 7:26:15 GMT
This is a nice example of a Globular cluster degradation by the gravity force of the Milky Way. The nucleus is losing stars that are seen in the form of long chains that are stretching and moving away from him toward the nearby galaxy NGC 6544 is a 7th magnitude Globular Cluster appearing in the constellation Sagittarius. It is 9785 light years from our solar system. NGC 6544's apparent size is approximately 9.2 arcminutes, corresponding to a physical diameter of 26 light years.
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