emamajek on 09-Apr-2025 23:37:10 GMT about PM J21137+3634
PM J21137+3634 = 2MASS J21134479+3634517
is now a binary in Washington Double Star catalog:
WDS J21137+3635 = LDT 19
Clark+2024 (2024AJ....167...56C, Table 4) resolves it into a tight binary
epoch band(nm) PA(deg) sep(") del(mag)
2018.6600 832 40 10.6 0.3868 0.31
2019.6995 880 50 5.5 0.3596 0.14
The GaiaDR3 positions make sense with respect to the reported position angle in Clark+ if one assigns
A = Gaia DR3 1868576481922989824 (Gmag=13.213416)
B = Gaia DR3 1868576481912982400 (Gmag=13.143676)
where if Gaia DR3 1868576481922989824 is the primary, then at epoch 2016.0 in Gaia DR3, the separation 450.2+-2.3 mas at PA = 18.9159 deg.
Neither Gaia DR3 component has parallax or proper motion in the DR3 catalog itself.
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