Venus + double star

 Hi Finbarr. Thank you for your question.

The list I got over on www.cloudynights.com is this one: 2343 Carbon stars brighter than Mag. 13 . 

Apologies it does not open on our website. I just copied and pasted it.  
A guy called Eric (Cildarith) sent it to me originally nearly one year ago in April 2019.
Of course the list is huge. 
And a lot of these carbon stars are not visible from Ireland at all for one reason or another. 
Some are too low and some are too faint. 
So I very slowly work my way through them. 

I simply pick a constellation and find the right ascensions and declination of that constellation using the list. 
For instance, Cancer ranges from 7 hours 55 minutes in RA to 9 hours 21 minutes. Declination ranges from +33 degrees north to +6 degrees north.
Needless to say I don't rush!!
I locate the star. Then print off a map using my Guide 9.1 DVD. 

But to answer your original question: to observe 100 would be nice. 
And It would be nice to find a decent carbon star as number 100. 

I haven't come across your list before. Not that I can remember. 
But all lists regarding these fascinating stars are always worthwhile. 

By the way, I don't think there are many more carbon stars for me to find in Cancer. 
There might be 2 or 3 more. 
But V Cancri appears to be far too faint right now according to www.aavso.org   

Clear skies to you, Finbarr. 

Aubrey. 
 

Excellent. Here is a table showing how many stars are visible down to each magnitude:

www.stargazing.net/david/constel/howmanystars.html

Then if we round off the number of stars above mag 13 we get some 12.5 million. So, fewer than 1 in every 5,000 stars is a carbon star!

Clear skies,
Finbarr.

That is most interesting, Finbarr.
Thank you for your willingness to share these good facts with the rest of us.

Clear skies,

Aubrey.

And tonight Venus 2.2 degrees NW of Uranus. The 7th planet is 24 times more distant and 12,000 times fainter.



Finbarr.

What a nice photo Finbarr. Thanks for sharing it with us. 

Clear skies, 

Darren.