外部連結
- [https://iawn.net/obscamp/2019XS/ 2019 XS: Timing Assessment] , International Asteroid Warning Network, 3 October 2021
- [https://echo.jpl.nasa.gov/asteroids/Orpheus/Orpheus.2021.goldstone.planning.html Goldstone Radar Observations Planning: Orpheus, 2004 UE, 2019 XS, and 2010 VK139] , Lance A. M. Benner, Jet Propulsion Laboratory
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