An Etymological Dictionary of Astronomy and Astrophysics
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An extremely → metal-poor and high-velocity F3-type → subgiant with → apparent visual magnitude 7.205 ± 0.02. It has other designations, among which BD-10 4149, GJ 1195, HIP 76976, and SAO 159459. HD 140283 is situated in the solar neighborhood at some 200 → light-years from the Earth (→ trigonometric parallax 17.15 ± 0.14 mas) in the constellation → Libra. Its color E(B - V) = 0.000 yields a visual → absolute magnitude  M_V = +3.377. Its → surface temperature is T_eff = 5777 K. Its iron and oxygen surface → chemical abundancees relative to hydrogen are [Fe/H] = -2.40 and [O/H] = -1.67, making it the most metal-poor star so far known (2021). Using precise observational data, an age of 14.46 ± 0.8 Gyr has been derived for this star. Within the errors, the age of HD 140283 does not conflict with the age of the → Universe, 13.77 ± 0.06 Gyr, obtained from the → cosmic microwave background radiation and the → Hubble constant. HD 140283 must have formed soon after the → Big Bang and is the oldest known star. This is why it is sometimes nicknamed the → Methuselah star (H. E. Bond et al., 2013, arxiv.1302.3180).

The star's name in the → Henry Draper system