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Bessel 61 Cygni companion stars for parallax calculation

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#1 MVoltae

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Posted 17 November 2019 - 09:22 PM

I am looking for the modern designations for the two companion reference stars that Bessel used for his calculation of the parallax value for 61 Cygni.  Thank you for any help. 



#2 beggarly

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Posted 18 November 2019 - 01:56 AM

https://www.stelledo...?iddoppia=93063

 

http://simbad.u-stra...ubmit=submit id

http://simbad.u-stra...ubmit=submit id



#3 MVoltae

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Posted 18 November 2019 - 09:01 AM

Thank you for responding to my query, but I  guess I did not state my question very well. I am trying to get information not on 61 Cygni, but rather on the two BACKGROUND stars that Bessel used to calculate the change in 61 Cygni's position so that he could calculate the parallax value for 61 Cygni.   Looking for their modern designations so that I can find them in the sky.  



#4 beggarly

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Posted 18 November 2019 - 05:13 PM

http://articles.adsa...000052.000.html Page 53.

 

star 'a': http://simbad.u-stra...ubmit=submit id

star 'b': http://simbad.u-stra...ubmit=submit id



#5 MVoltae

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Posted 18 November 2019 - 05:50 PM

Beggarly, 

 

Exactly what I was looking for.  Have used Stellarium to visualize the sky from Konigsberg/Kaliningrad on the days of Bessel's observations in 1837/1838 and so gained an appreciation of the very small changes in angular distances that he was able to ascertain over the course of his observations.  A truly remarkable achievement.  

 

Thanks,  MVoltae


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