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thelittleman
Vendor (Peter's Actions)
Reged: 05/21/05
Posts: 4077
Loc: Hampshire, UK
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I posted this in my most recent report, but I thought it 'deserves' a little post of its own.
I was observing Abell 1656 (with little success - the moon was up). I had found the right area really quite easily and was just making sure I was right when I realised I couldn't see this star (see image). Everything else matched. According to the sky chart, it should be of a similar magnitude to the other three in the triangle.
Has anyone else seen this, or would like to check it out tonight?
Thanks,
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Clear Skies,
Peter
Photoshop Tutorials and Actions! New actions now added 
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 6777
Loc: Beatrice, Nebraska
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Quote:
I posted this in my most recent report, but I thought it 'deserves' a little post of its own.
I was observing Abell 1656 (with little success - the moon was up). I had found the right area really quite easily and was just making sure I was right when I realised I couldn't see this star (see image). Everything else matched. According to the sky chart, it should be of a similar magnitude to the other three in the triangle.
Has anyone else seen this, or would like to check it out tonight?
Thanks,
The star atlas you show is incorrect, as there is no bright star at the location of the "missing star" (in the galaxy NGC 4889). The Hubble Guide Star catalog lists a magnitude 9.5 "non-star" at that location", so unless you have that option switched-off in your atlas software, it might show up. Some atlases just bring in a lot of stars from the GSC without regards to whether the GSC itself considers them real or not (non-stars, blends, artifacts, etc.), so that might be a problem with that particular page. Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
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thelittleman
Vendor (Peter's Actions)
Reged: 05/21/05
Posts: 4077
Loc: Hampshire, UK
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That would explain why I couldn't see it then!
Thanks Dave!
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Clear Skies,
Peter
Photoshop Tutorials and Actions! New actions now added
Preprocessing in Iris Tutorial
http://peter-morris.magix.net/
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MikeRatcliff
Pooh-Bah
Reged: 06/12/04
Posts: 1107
Loc: Redlands, CA
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Another thing to watch out for is that variable stars are often printed at their maximum magnitude only. There are a few stars around that have a big range and could cause confusion.
Once when starhopping towards M83, I was expecting three medium bright stars in a line in my binoculars (centered on Gamma Hydra), but only saw two! The missing one was a Mira-type variable.
Mike
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16" f/4.9 dob
Tele Vue Plossls 32,25,20,15,11
13 Nagler T6
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12.5 UO ortho, 9 Circle T ortho
2x TV Barlow
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thelittleman
Vendor (Peter's Actions)
Reged: 05/21/05
Posts: 4077
Loc: Hampshire, UK
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Yes I did think about that - thanks Mike. The next time I go out I will look again.
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Clear Skies,
Peter
Photoshop Tutorials and Actions! New actions now added
Preprocessing in Iris Tutorial
http://peter-morris.magix.net/
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