RT Journal Article
T1 The Closest Past Flyby of a Known Star to the Solar System: HD 7977, UCAC4 237-008148 or WISE J072003.20-084651.2?
A1 Fuente Marcos, Raúl de la
A1 Fuente Marcos, Carlos de la
AB 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.
PB American Astronomical Society
SN 2515-5172
YR 2022
FD 2022-07
LK https://hdl.handle.net/20.500.14352/71964
UL https://hdl.handle.net/20.500.14352/71964
LA eng
DS Docta Complutense
RD 25 mar 2026