emamajek on 19-Feb-2019 01:44:57 GMT about CD-31 10766
WASP-15 has a multiple star entry in the Washington Double Star catalog: WDS J13557-3210 (WSP 15). The B component is listed at separation 19.5" away at PA = 238 deg with mag = 19.20. Here is the Gaia DR2 ID for the companion:
WDS J13557-3210B = Gaia DR2 6171009045253618816
RA, Dec = 208.92258372159 -32.16258089799 (ICRS, epoch 2015.5)
plx = -0.1976 +- 0.6974 mas
pmRA, pmDec = -24.327, -1.797 (+-1.221, 1.114) mas/yr
G = 20.0033
And a comparison to the Gaia DR2 entry for WASP-15:
WDS J13557-3210A = WASP-15 = Gaia DR2 6171009049549197824
RA, Dec = 208.92801112482 -32.15971175793 (ICRS, epoch 2015.5)
plx = 3.5168 +- 0.0416 mas
pmRA, pmDec = 8.770, -22.390 (+-0.065, 0.067) mas/yr
G = 10.7970
The astrometry suggests that the pair is unphysical.
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View annotation on CD-31 10766 object