Talk:Epsilon Scorpii

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thread_title:  External links modified 

message: Gaia DR2 shows that ε Scorpii has a companion, Gaia DR2 6026152137815012096 (also found in DR1) with G ~ 12.17 and BP-RP ~ 2.57, making it an M3/M3.5 red dwarf.
:Not a lot we can do with that, I'm afraid.  At best, we'd be making inferences that stray into WP:OR.  At worst, doing a bit of my own original research, the DR2-derived data around ε Sco is somewhat dubious, with a sixth-magnitude star being reported at about the same separation (a few arc-seconds) with comparable (very large!) proper motion.  It is marked as being subject to duplicate observations which tends to mess things up, also it has a parallax significantly less than ε Sco itself (Hipparcos) or the supposed companion.  An educated guess would say the 6th magnitude star is an artefact, so what of the fainter one?  ε Sco itself is not shown, which is not surprising for such a bright star.  Time will tell.  Lithopsian (talk) 20:58, 21 June 2018 (UTC)
replies: text:  I got the impression that Gaia DR2 6026152137854405248 is ε Sco — the estimated G mag of 1.7 is much brighter than Gaia's saturation limit, so the photometry and parallax produced are bad (I've noticed this for some other stars, like Mizar and Porrima). Gaia DR2 6026152137815012096 is much dimmer and the parallax error is under 0.1, in line with many single red dwarfs.JamesFox (talk) 13:56, 22 June 2018 (UTC)
replies: text: Very likely.  The position is slightly off, as is everything else, but that's to be expected.  Usually though, bright stars just aren't even listed.  Parallax error in DR2 is smallest at about magnitude 12.  Still too much speculation to announce anything ground-breaking ourselves.  Just mentioning the star in the article would be pushing it, given the obvious problems in that little patch of sky.  For example, if both the reported parallaxes turn out to be accurate (and the second star is actually ε Sco), then the two would be about five parsecs apart, quite a lot to be calling them a double system.  And given the positional errors for at least one of those stars (again assuming one is ε Sco), then we can't even offer a good separation.  My vote would be to wait for someone to actually go and look at what should be a fairly easy-to-spot companion if it is really there.  Lithopsian (talk) 15:40, 22 June 2018 (UTC)
replies: text: I agree. Saying that the Gaia data shows that ε Sco has a companion is an interpretation of the data. Let someone else make that interpretation and publish it in a reputable source. Cuddlyopedia (talk) 09:54, 23 June 2018 (UTC)
thread_title:  System is Binary