emamajek on 01-May-2020 18:24:19 GMT about CD-42 1943
CD-42 1943 is a binary:
WDS J05266-4220 = DON 106
WDS reports sep=4.4", PA=247 (epoch 2015)
First reported binary measurement is by H.F. Donner in Rossiter+1937
1937MmRAS..65...51R
: epoch 1928.877, PA=267(B1900), sep=2.8"
(mags=10.2, 13.7).
Component A = Gaia DR2 4805866957374888448 (G=10.1959)
Component B = Gaia DR2 4805866957374888576 (G=11.7698)
Secondary is currently lacking a SIMBAD entry.
Tian+2020 (2020ApJS..246....4T) used the GaiaDR2 astrometry to
demonstrate common proper motion, and reports sep=4.4472" (88.467 au)
- so it is a physical binary.
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