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Observing >> Deep Sky Observing

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ngc 9999
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Reged: 08/13/12

Loc: Sunrise, Fl. 26 degrees N
Hunting open clusters new
      #5660410 - 02/03/13 05:27 PM

I am in a project of how many open clusters I can catch with my Garrett Signature series 10x50 binoculars and I want to know a website where they publish the magnitude of the members of the cluster.

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GlennLeDrew
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Hunting open clusters new [Re: ngc 9999]
      #5660535 - 02/03/13 06:28 PM

The magnitude data you seek will, if available for the cluster, be either that of the brightest star (probably more common) or the fifth brightest star.

When this is lacking, the integrated magnitude, apparent diameter, number of members, Trumpler class and age will provide useful indicators of visibility in any particular instrument, in about decreasing order of relevance as listed here.


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stevecoe
"Astronomical Tourist"
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Reged: 04/24/04

Loc: Arizona, USA
Re: Hunting open clusters new [Re: GlennLeDrew]
      #5660986 - 02/04/13 12:24 AM

The Saguaro Astronomy Club database is available on our website it contains much of the data Glenn mentioned. It is a zip file that includes the data as an Excel file and as delimited text. There is a documentation file as well.

Go to www.saguaroastro.org

Look for "Things to Download" on the left side of the start up page.

Enjoy;
Steve Coe


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Tony Flanders
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Reged: 05/18/06

Loc: Cambridge, MA, USA
Re: Hunting open clusters new [Re: ngc 9999]
      #5661174 - 02/04/13 06:31 AM

Quote:

I am in a project of how many open clusters I can catch with my Garrett Signature series 10x50 binoculars and I want to know a website where they publish the magnitude of the members of the cluster.




Your best bet is to get a good planetarium program, display the cluster, and find out the magnitudes of the stars. The Tycho-2 catalog includes all stars that are likely to be visible in 10x50 binoculars even in ideal conditions.


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John_G
sage


Reged: 01/18/10

Re: Hunting open clusters new [Re: stevecoe]
      #5661178 - 02/04/13 06:34 AM

Try looking at observing list for the AL Deep Sky Binocular. Most on the list are OCs. They publish the magnitude with each target. It's a great list for hunting OCs. Many are visible with 10x50s.

http://www.astroleague.org/al/obsclubs/dsbinoc/dsbinoc.html


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Man in a Tub
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Reged: 10/28/08

Loc: Fogpatch, CA
Re: Hunting open clusters new [Re: Tony Flanders]
      #5661395 - 02/04/13 09:52 AM

Quote:

Quote:

I am in a project of how many open clusters I can catch with my Garrett Signature series 10x50 binoculars and I want to know a website where they publish the magnitude of the members of the cluster.




Your best bet is to get a good planetarium program, display the cluster, and find out the magnitudes of the stars. The Tycho-2 catalog includes all stars that are likely to be visible in 10x50 binoculars even in ideal conditions.




Cartes du Ciel.

http://www.ap-i.net/skychart/en/download


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ngc 9999
super member


Reged: 08/13/12

Loc: Sunrise, Fl. 26 degrees N
Re: Hunting open clusters new [Re: Man in a Tub]
      #5661435 - 02/04/13 10:16 AM

I have already downloaded Cartes du Ciel.

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GlennLeDrew
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Hunting open clusters new [Re: ngc 9999]
      #5661549 - 02/04/13 11:12 AM

Better yet, obtain a copy of the Cambridge Photographic Sky Atlas. For the binocular observer, this might well be the ultimate (printed) atlas. In the software world, Starry Night Pro Plus's all-sky photomosaic is even better, as you can zoom in for better detail. There's nothing like a realistic representation of what you'll see, as opposed to plotted symbols, and trying to visualize an object based on numeric data.

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LivingNDixie
TSP Chowhound
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Reged: 04/23/03

Loc: Trussville, AL
Re: Hunting open clusters [Re: GlennLeDrew]
      #5663835 - 02/05/13 03:59 PM

There is also a Open Cluster pin from the Astronomical League. I also second the Deep Sky pin that someone else mentioned.

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