emamajek on 09-Feb-2025 04:17:54 GMT about 2MASS J03261367+2950152
2MASSW J0326137+295015 (Gaia DR3 120793859256662144) has a reported optical companion and is itself an astrometric binary. Note that the current (2/2025) entry in Washington Double Star catalog (WDS J03262+2950) lists the separation/PA/mag parameters for the resolved wide binary, but the spectral type (L3.5+L7) and orbit in ORB6 corresponds to the astrometric binary (which is unresolved in star catalogs).
Resolved companion: WDS (B/wds/wds) lists the object as binary WDS J03262+2950 = ALP 10, first reported by Allen+2007(2007AJ....133..971A). They list the companion at del(RA)=-24.9", del(Dec)=-1.5", with only an inferred *absolute* magnitude M_J(sec)=15.1 and color J-K=1.3 - but no other information. Malkov+2016(J/BaltA/25/49/ilb_new) IDs the "companion" as entry BSBD J032613.67+295015.1:c2 and WDS J03262+2950B.
The companion appears to correspond to WISE J032611.75+295015.3, which in the 1st WISE catalog (Cutri+2012,2012wise.rept....1C) appears relative to 2MASS J03261367+2950152 at separation=24.81+-0.77", PA=268.49deg (which agrees well with Allen+). The source currently lacks a SIMBAD entry, but could be IDed as WDS J03262+2950B = ** ALP 10B = WISE J032611.75+295015.3 = AllWISE J032611.73+295015.1 = UGPS J032611.71+295014.6.
Correspondingly, 2MASS J03261367+2950152 could be IDed as WDS J03262+2950A = ** ALP 10A.
Astrometric binary: Harris, H.C., Dahn, C.C. & Dupuy, T.J. 2015 (2015csss...18..413H) reported 2MASSW J0326137+295015 as an astrometric binary with P=7.53yr, a=13.8mas, e=0.11, i=37deg, and they list the components with absolute magnitudes M_J(A)=12.99, M_J(B)=14.5, hence del(J)=1.51 (secondary is responsible for ~25% of J-band flux), masses M(A)=0.061+-0.010Msun, M(B)=0.044+-0.008Msun. They estimate the spectral type of the pair to be L3.5 and L7.
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