emamajek on 08-Oct-2019 07:17:42 GMT about HD 221503
GJ 898 shares common proper motion with the binary GJ 897 (with the overall system being at least a triple). The short baseline astrometry for GJ 897 is low quality due to the nearly edge-on rapid orbit, however the long baseline proper motions are very consistent
with co-motion.
GJ 898:
Gaia DR2:
pmRA = 340.980+-0.123 mas/yr
pmDec = -218.978+-0.072 mas/yr
plx = 68.6979+-0.0581 mas (=> D = 14.56+-0.01 pc)
Tycho-2:
pmRA = 343.3+-1.8 mas/yr
pmDec = -218.6+-1.7 mas/yr
PPMX:
pmRA = 343.33+-1.1 mas/yr
pmDec = -218.07+-1.2 mas/yr
GJ 897AB:
Tycho-2:
pmRA = 352.0+-2.6 mas/yr
pmDec = -216.1+-2.7 mas/yr
PPMX:
pmRA = 349.99+-2.0 mas/yr
pmDec = -218.08+-2.1 mas/yr
parallaxes:
plx = 69+-13 mas ; Woolley+1970
plx = 63+-4 mas ; Heintz 1986 (59 mas using just their data)
plx = 77.5+-9.0 mas ; Gliese+1991
plx = 64.8+-4.1 mas ; CNS3
plx = 66.0 mas ; Tokovinin+2018
Positions (ICRS):
GJ 898: 353.20736065331 -16.84658805414 (Gaia DR2)
GJ 897AB: 353.19568827159 -16.75325049255 (Gaia DR2)
separation = 338.41" (PA = 353.17 deg)
Minimum physical separation is ~4900 au.
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View annotation on HD 221503 object