Chi Cygni

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Tony Markham
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Chi Cygni

Post by Tony Markham »

If you are able to observe after midnight, you can watch the Mira type variable rising towards maximum over the next month. My latest observation on the morning of the 5th estimated it to be mag 8.1. It should be around 3 magnitudes brighter a month from now. However the rise in brightness won't be at a steady rate - it usually pauses at some stage for around 10 days and the shoots up by more than a magnitude in around a week.

The SPA chart for chi Cygni can be found at http://www.popastro.com/images/variable ... -cygni.gif
(comparison A is eta Cygni, comparison B is 17 Cygni)
nigeljoslin
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Re: Chi Cygni

Post by nigeljoslin »

Ta! I was observing late around Cygnus (still low in SW Scotland) a couple of nights ago; this star will be an interesting change to the familiar star pattern. Is it a very attractive red?
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Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

Chi Cygni is a rather red star, having a S-type spectrum and a B-V colour index of +2.1.

It is redder than Mira, but not as red as carbon stars such as UU Aur or W CMa.
Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

Chi Cygni has brightened significantly in just a few days - two mornings ago I estimated it as mag 8.1, but this morning it was mag 6.5.
nigeljoslin
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Re: Chi Cygni

Post by nigeljoslin »

Redder than Mira, nice.....hoping it maintains that brightness. I'll have a peep tomorrow night, when the weatherman is predicting total clarity of sky!
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Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

After a cloudy spell since the morning of the 7th, clear sky this morning allowed another view of chi Cygni - estimated to be mag 4.9.
Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

Latest estimate of chi Cyg from 0200UT this morning was mag 3.8 (etaCyg+2) using 10x50 binoculars - making it a particularly bright maximum this year.
BillW
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Re: Chi Cygni

Post by BillW »

Hi Tony,

Not a variable star man myself but I was testing out a grating holder for a CCD camera so I decided to do a quick test since I had the gear powered up.

After reading the comments about Chi Cyg being a very red star I thought it would be interesting to do a quick comparison.

Chi Cyg is the star above the text.

The IR image is a 5 second exposure using a 25mm cctv lens with a RG9 near IR filter.
The Vis image is a 7 second exposure with the same lens but a BG40 visible band pass filter.

It is considerably brighter in the red!

Cheers,
Bill.
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Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

Looks like it may have reached its 2013 peak - estimated as mag 3.8 again yesterday morning using 10x50 binoculars.

Now that the Moon is getting out of the way, it actually can be seen with the naked eye.
nigeljoslin
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Re: Chi Cygni

Post by nigeljoslin »

At last, having come back from a holiday, I saw it this morning at 2.30 a.m., under a stunning sky, with the 14 inch Dob. Many thanks, Tony - a lovely colour - well worth the view.....I like a nice red!
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mike a feist
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Re: Chi Cygni

Post by mike a feist »

Having looked at the comet (qv) at 3am this morning, turned the Minox spottng scope onto Chi Cygni .......nicely shown! (with unaided eye too) maf
Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

Chi Cygni is still around maximum - my latest estimate has it at mag 3.9.
Tony Markham
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Re: Chi Cygni

Post by Tony Markham »

Here is a light curve showing my observations of the 2013 maximum of chi Cygni
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David1952
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Re: Chi Cygni

Post by David1952 »

Tony,

Interesting graph. It looks about the same as the images I have been taking over the last few months. I am using an 8 sec shot with a static DSLR set at 1600 ISO. I will track it until I can't detect it any more, at about mag 10.

Thanks for posting your results.

David
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