This is one of those occasions when I simply run out of superlatives.
On Monday night 29th October 2018 I set up my William Optics 158 mm F/7 apochromatic refractor in my back garden and purposefully set out to find the carbon star NC 4 in the extreme northern part of Andromeda.
In fact the star is very near the border of Cassiopeia.
I started my journey from the beautiful binary Almach in my William Optics 70 mm guidescope at 11X .
Starhopped my way up to mag 5 Chi Andromedae. Then northwards up to Omega and Xi Andromedae and finally came to 4.3 mag Phi Andromedae.
About 4 degrees northeast I came to a 6.5 mag star HD 8160.
Directly south of this star I came across a 6 star asterism with magnitudes varying from 10.9 down to 12.3 magnitude in my main scope.
Right next to these stars I see a good strong orange carbon star NC 4 at 112X.
I increased my magnifications to 167X and the star truly has a very good orange hue.
I decided to increase my powers even further; because on my Guide 9.1 DVD NC 4 is shown as a double star.
At 225X and 280X I was completely astounded to see a 11.7 magnitude star right next to NC 4!
Its designation is 3UC 280-021968.
That secondary star had a slight red tinge which I saw at 280X.
These stars are faint. There is no doubting that.
NC 4 has a magnitude of 9.6.
Unfortunately www.stelledoppie.it does not appear to have a designation.
But to me this is a most remarkable double star!!
I have since worked out that the 2 stars are 10 arc seconds apart.
NC 4 is my 22nd carbon star in Andromeda and my 68th overall.
In closing, I would like to thank Eric (Cildarith) for bringing my attention to NC 4.
It has been worthwhile to observe this most excellent gem for the 1st time.
Thank you for reading. Comments are most welcome.
Clear skies from Aubrey.
Edited by flt158, 29 October 2018 - 05:53 PM.