I thought I should discuss with you all my final carbon star in Andromeda on the Double Star Forum as it is positioned about 45 arc seconds from a yellow star TYC 3303-1008 which has a magnitude of 10.8.
It was Eric (Cildarith) who was the original individual who gave me the challenge of observing an additional 18 carbon stars after I had observed 8 easy carbons 2 years ago.
So having successfully observed 25 of the 26, I set out to find Case 717 which also has the designation C* 108.
On my Guide 9.1 DVD the 26st carbon star ought to have a non varying magnitude of 11.7. On that DVD the carbon star has the rather awkward designation 3UC279-040586.
I won't be using that title on this occasion. It will probably be no help to anybody.
Also I was able to split the nearby double star ES 458 in Andromeda at 112X, 140X and 167X which was an enormous help to finding the yellow star TYC 3303-1008. ES 458's separation is 5" with a PA of 316 degrees. The magnitudes are 10.2 and 11.0.
Now let me discuss Case 717. You would think that if its magnitude is 11.7 I should be capable to see it at 167X.
But no! There was no sighting of it. Precisely 1 week ago on the 1st February 2019 I went up to higher magnitudes -225X and 280X but still no carbon.
Finally out came my Nagler 3.5 mm eyepiece on that night which gives 320X. (It was a pristine night with no Moon) and I reckon I could see a dim orange star. But that was by using averted vision only.
By my reckoning Case 717 or C* 108 might be as dim as magnitude 13.0 right now.
One of my friends checked the star on Sky Safari. It states Case 717 ought to have a magnitude of 10.2. But that clearly is wrong.
However it also states that the star has another designation: V0762 Andromedae.
So maybe it is a variable star after all.
However I have since gone to www.aavso.org where V0762 And is not considered a variable star.
www.aavso.org have given it their own designation: 000-BMZ-062.
They also give an estimated magnitude of 10.2.
So let me give the star to you guys on the Double Star Forum.
I realise it might be quite a number of days to offer an explanation.
There is no need to rush in with your opinions.
I will also welcome images or diagrams of any kind.
I'm sorry about all the designations -but I thought I ought to give as much information as is possible.
Thank you for reading my report.
I wish you all clear skies,
Edited by flt158, 08 February 2019 - 11:22 AM.