emamajek on 07-Sep-2024 06:24:26 GMT about * tet Ind
The theta Indi system (** HJ 5258 = WDS J21199-5327) appears to be at least a quadruple in WDS, comprised of the pairs ** MRN 3 Aa,Ab and ** HJ 5258 Ba,Bb. However see comment on ** MRN 3 from the recent paper by Tokovinin+2024 (2024AJ....168...28T):
"21199−5327 Ba,Bb. 21199−5327 Ba,Bb is the secondary star in the bright binary θ Indi (HJ 5258 AB, 7 3). H. Zirm (2023, private communication) has computed astrometric orbit of the subsystem Ba,Bb with a period of 26 yr and suggested that it should be resolvable by speckle interferometry. His prediction has been confirmed in 2023.32 and 2023.57. The magnitude difference of Ba,Bb is 5.4 mag in y and 3.7 mag in I, and the masses of Ba and Bb estimated from their absolute magnitudes are 1.08 and 0.54 Msun, respectively. According to Zirm’s orbit, Ba,Bb is closing down, and it will pass through the periastron in 2027.3. The brighter star A has been reportedly resolved in 2012.56 at 62 mas and designated as MRN 3Aa,Ab (Marion et al. 2014). However, this resolution, never confirmed, is likely spurious, considering the constant RV of star A (Lagrange et al. 2009) and its good Gaia astrometry."
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