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Posted by Paul A Brierley at 09:02 on 2010 Sep 02
Last night whilst observing the star 61 Cygni, through my Orion (UK) 10" F4.8 Dobson with a 24mm Panoptic (x50)I was drawn towards a fainter and very red star. Through my eyepiece this star was directly above and slightly south-west of 61 Cygni (Primary)I suspect the star I was watching was the variable v1334 cygni (Sky At2000) Uranometria 2000 does not show any variables, or carbon stars in this area. I wonder, please, whether somebody with more knowledge of the sky, could tell me what I was looking at last night, at 21:00hrs UT.
Posted by Callum Potter at 12:29 on 2010 Sep 02
Hello Paul,not sure i can help really… How far was this red star from 61 Cyg ? The variable you mention is about 2.5 degrees away, is that about right ?I did a quick review of ‘bright’ carbon stars in Cygnus, but none come very close to 61 Cyg.Also, V1334 Cyg is a fast period cepheid (3 days), and reported as spectral type F1, so should not be especially red. So, sounds like a bit of a mystery…Regards, Callum
Posted by Paul A Brierley at 17:39 on 2010 Sep 02
Hi Callum,The star was in the same field as 61 Cyg and was visible above and to the right of the companion star to 61 Cygni. I can’t say how far it was unfortunately.I’m off tomorrow on a week-end field trip to Harris House in the Yorkshire Dales with members from Macclesfield AS.I will look again if it’s clear tomorrow evening and see if there is somebody there who can identify this mastery object. Or see whether the star shows any variability.On reflection, I probably saw a red giant; but It would be nice to know if it has a number.
Posted by Gary Poyner at 19:36 on 2010 Sep 02
There are a number of very red stars in that field. You didn’t sayhow large your FOV with that eyepiece is, but this star isa candidate TYC 3168 1108 Spec. M0 and mag 8.47 It’s 12.5 arc minutesdue south of 61 Cyg. I’ve attached a one degree field (N to bottom, Eto right) with 61 Cyg centered (Guide 8).Gary
Posted by Paul A Brierley at 20:06 on 2010 Sep 02
Thank you Gary,I’m sorry for missing vital information. The eyepiece is a 24mm Panoptic with a 68 deg FOV; The true field of view is 1.36deg. Magnification x50 and the telescope focal length is 1200mm f4.8
Posted by Gary Poyner at 10:45 on 2010 Sep 03
Hi Paul,OK. Lets try again (my last attempt was slightly too big).Here is a 2 degree field from GUIDE 8. The circle in the centeris 1 degree. The limiting magnitude is only 11, as it would lookvery crowded at this size if it went any fainter. Is your star here?
Cheers,Gary
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