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2nd carbon star 1 degree from WZ Cas

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#1 flt158

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Posted 20 September 2020 - 08:42 AM

Good day to you all. 

 

I did set up my William Optics 158 mm F/7 apochromatic refractor in my back garden on Saturday night 19th September 2020 under a Bortle 9 sky.

The sky was very clear with no Moon visible as I was seeking out some double stars in the WZ Cassiopeiae area. 

We all love observing the strong bright rich orange carbon star WZ Cas itself with its blue-white companion SAO 21006 quite close by. Do we not?

But I was aiming to seek out a very challenging faint carbon star which has the designation Case 271 or, as my Guide 9.1 DVD calls it, 3UC302-001937 which is about 1 degree away. 

Simbad had drawn my attention to it in the recent past..

It gives the spectral class as C5,4 and a V magnitude of 11.15 

VizieR gives it a magnitude of +12.1.

And I am now of the opinion that VizieR is 100% correct. 

There is a star called TYC 4014 2776 very close by whose mag. is +11.4; and Case 271 is much fainter than that. 

I could only see Case 271 at a minimum magnification of 167X with the double star HJ 1930 in the same field of view. 

However Case 271 was only very slightly orange to my eyes at magnifications up to 225X.  

Therefore I do fully realise that this carbon star is not going to excite too many observers even here on the Observational Astrophysics forum.

But I am glad to say it is my 10th observed carbon star in Cassiopeia and my 87th overall. 

 

Comments, corrections and images are very welcome 

 

Thank you for reading. 

 

Aubrey.  

 


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#2 ssmith

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Posted 20 September 2020 - 07:00 PM

Hi Aubrey -  Here is a photo of Case 271 nicely highlighted by  HJ1930 & HJ 1928.

 

HJ1930-28 Cass 120mm 1-11-18.jpg


Edited by ssmith, 20 September 2020 - 08:49 PM.

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#3 flt158

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Posted 21 September 2020 - 11:59 AM

Hello, Steve. 

You are such a true gentleman!

Thank you for providing me and the rest of us with this wonderful image of all 3 spectacular celestial objects.

I have since compared your image with a Guide 9.1 display set for the 11th January. 

The year doesn't matter of course. 

Everything is spot on! 

 

In your image Case 271 does have a nice and fairly decent orange hue. 

I notice you are stating that Case 271 has a magnitude of 11.4. 

Is it possible for you to figure out how much of a variable star Case 271 actually is?

As you can see above I reckon this carbon star is of magnitude 12.0 or 12.1 right now.

Maybe it's okay to suggest the star's visual magnitude does indeed vary between 11.15 (as Guide 9.1 suggests) and 12.1. 

 

One thing I should have said above is that Case stands for Case Western Reserve University. 

Someone in that university must have discovered Case 271. 

 

Clear skies, everybody, from Aubrey. 



#4 ssmith

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Posted 22 September 2020 - 08:26 PM

Aubrey -

 

I measured Case 271 on my photo from 2018 using Astrometrica and came up with a value of 12.1v which matches your current magnitude estimate.   The 11.4 value that I put on my photo back in 2018 I pulled from SIMBAD.

 

I have looked for data on the variability of Case 271 but haven’t found anything,  but all Carbon stars exhibit some measure of variability.


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#5 flt158

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Posted 23 September 2020 - 11:11 AM

Thank you very much, Steve, for that piece of good information. 

 

Clear skies, 

 

Aubrey. 



#6 Rich (RLTYS)

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Posted 25 September 2020 - 03:13 PM

Can someone post the RA and DEC for CASE 271?



#7 flt158

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Posted 25 September 2020 - 06:32 PM

I can give you the RA and DEC for Case 271. 

 

RA: 00 04 10.83. 

 

DEC: +60 55 22.40. 

 

Best regards from Aubrey. 



#8 KMAO

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Posted 25 September 2020 - 07:00 PM

CASE 271

is also designated as  GSC 4014 3052

(in guide8)

KMA


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#9 Rich (RLTYS)

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Posted 01 October 2020 - 03:37 PM

Thanks!




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