tdfwds - I have very poor computer skills, - and can barely use my smart phone. I think you may be right about it being a Stellarium artefact. If I get out with my 102F/7 or my C8 this season, I will crank them up to see what shows up. Carbstone says he got 4 components with his C8. My Stellarium is 2015 dated, - but I believe in the axiom - "if it ain't broke, - don't fix it", so it does so much very good, that I don't chance any updates to invite trouble.
It's in the start menu somewhere, called snip. I'd never heard of it till IT (called IS for information services for some reason, I got into trouble when I called them ISIS once in a slip of the tongue...) got all keen on it when they upgraded us to win10 and the universe fell to bits. Then they got this communication setup thingy where they could watch your screen. Still took ages to for them to fix anything though (which invariably consisted of simply reinstalling entire suites), so I don't know what the point was.
As you say, if it ain't broke, leave it be. Now go to Richmond, Seattle and shout that at them! ; )
Also apologies, it's spelt artifact, my spelling has gone downhill since computers, especially as most UK dictionaries available for packages still will forgive US spellings half the time, even if they also have UK spellings in them. It always used to make me smile at work when outlook (which personally I don't allow on my computer) used to allow the word colour in the body text of an email, but underline it with a red wiggly line when put in the subject heading of the email! Somehow a different dictionary for each bit! Mind you, I found Word had been set up for the Australian English dictionary by IS for some reason...
The D star that the other fellow mentioned exists, but it is nowhere near the main pair, being farther from the main pair than the C star is by nearly 3 times.
Ah, well, the clouds came in and stayed, so no comet for me. Time for bed, said Zeberdee... ...boing!!!
(Surprisingly, some folk will understand that bit).