2026-06-28T20:28:33Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/719642023-08-06T01:25:57Zcom_20.500.14352_14col_20.500.14352_15

The Closest Past Flyby of a Known Star to the Solar System: HD 7977, UCAC4 237-008148 or WISE J072003.20-084651.2? Fuente Marcos, Raúl de la Fuente Marcos, Carlos de la It is argued that the closest past flyby of a known star to the solar system was that of Scholz's star (WISE J072003.20-084651.2). Here, we show that the distribution of distances of closest approach of this star has a median value of 0.330 pc with a 90% probability of coming within 0.317–0.345 pc of the Sun; the associated time of perihelion passage is determined to be between 78.6–81.1 kyr ago with 90% confidence, with a most likely value of 79.9 kyr. Using Gaia DR3 data and the latest planetary ephemerides, we found that UCAC4 237-008148 (RUWE = 0.927) approached even closer with a median perihelion distance of 0.259 pc and a 90% confidence interval of 0.249–0.269 pc, 1.158 Myr ago. HD 7977 might have passed 0.15 pc from the Sun 2.77 Myr ago, but it has RUWE = 2.015. 2023-06-22T10:58:41Z 2023-06-22T10:58:41Z 2023-06-22T10:58:41Z 2022-07 journal article https://hdl.handle.net/20.500.14352/71964 2515-5172 10.3847/2515-5172%2Fac842b eng https://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España American Astronomical Society