emamajek on 14-Feb-2020 01:09:13 GMT about HAT-P-3
The exoplanet host star HAT-P-3 appears to have a candidate stellar companion in Gaia DR2.
HAT-P-3: Gaia DR2 1510191594552968832
RA,Dec = 206.09401418601, +48.02856503748
(+-0.0191, 0.0193 mas; ICRS, epoch 2015.5, Gaia DR2)
plx = 7.4031 +- 0.0262 mas
pmRA, pmDec = -19.746, -24.008 (+-0.034, 0.038) mas/yr
Candidate stellar companion:
Gaia DR2 1510191594552968960
RA,Dec = 206.09763781398, +48.02732499907
(+-0.0615, 0.0648 mas; ICRS, epoch 2015.5, Gaia DR2)
plx = 6.9895 +- 0.0903 mas
pmRA, pmDec = -19.362, -23.465 (+-0.106, 0.116) mas/yr
separation = 9".800, PA = 117.098 deg
Given the companion's combination of brightness (G=16.96) and distance in Gaia DR2 (plx=6.9895 mas; M_G ~ 11.2), and its color (Bp-Rp=2.76), the star appears to be consistent with being a mid-M dwarf.
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