emamajek on 22-Dec-2024 09:03:14 GMT about UCAC4 486-052109
The Gaia DR2 parallax for UCAC4 486-052109 (Gaia DR2 3863292438160881792) is suggestive that it *might* be a very nearby star (plx=59.4668+-0.9540mas), however its Gaia DR3 solution is extremely noisy (sepsi=2.937e6, epsi=68.692mas) and an updated DR3 parallax was not provided. The Gaia DR2 proper motion is also suspiciously small (11.5 mas/yr) for such a high parallax (implying Vtan = 0.9 km/s!).
The LAMOST spectral data for this star from
2018ApJS..235...16B
(Teff=6105K, SpT=F6, logg=4.24) and predicted radius if the Gaia DR2 parallax is taken at face value (rad=0.035Rsun;
2020ApJS..247...28H
) are also not consistent. Together, these observations seem to suggest that UCAC4 486-052109 is much more likely to be a distant F dwarf rather than a very nearby star (and hence its GaiaDR2 parallax is likely highly over-estimated due to unresolved binarity).
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