emamajek on 18-Feb-2019 20:02:22 GMT about WASP-11
WASP-11 (HAT-P-10) has a binary star entry (WDS J03095+3040, WSP 11) in the Washington Double Star catalog, however the system is not resolved by Gaia DR2.
2015ApJ...800..138N
designate the companion "HAT-P-10B" and show it to share common proper motion.
2015ApJ...800..138N
report JHK photometry, and Wollert & Brandner (2015A&A...579A.129W) report iz photometry, separation, and PA.
In the Gaia DR2 data, there is an additional object 16.4" away (PA = 341.34) that could be another candidate companion.
WASP-11 = Gaia DR2 123376685084303360
RA, Dec = 047.36894723296 +30.67338166235 (ICRS, epoch 2015.5)
plx = 7.9921 +- 0.1325 mas
pmRA, pmDec = 3.856, -44.826 (+-0.267, 0.213) mas/yr
G = 11.5535, Bp-Rp = 1.2163
candidate companion:
Gaia DR2 123376719445431552
RA, Dec = 047.36725215714 +30.67769931562
plx = 7.8046 +- 0.1077 mas
pmRA, pmDec = 0.774, -45.836 (+-0.212, 0.167) mas/yr
G = 16.5620, Bp-Rp = 2.8230
The Bp-Rp and absolute G mag are consistent with a mid-M dwarf.
So WASP-11 (HAT-P-10) is at least a binary, and possibly a triple.
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