(121725) Aphidas Centaur
Discovered on 13 December 1999 by C. W. Hergenrother at Mount Hopkins.
During the battle between the Centaurs and Lapiths, the centaur Aphidas remained in a drunken sleep. The Lapith Phorbas killed Aphidas with a thrown spear while he slept.Naming citation (MPC batch dated 2017-10-05), IAU / Minor Planet Center, via NASA/JPL
Where Aphidas is today
Seen from above the solar system on 2026-10-14: Aphidas is 23.2 au from the Sun and 24.1 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 121725 |
| Provisional designation | 1999 XX143 |
| Orbit class | Centaur |
| Absolute magnitude (H) | 8.88 |
| Orbital period | 76.1 years |
| Semi-major axis | 18.0 au |
| Perihelion – aphelion | 9.67 – 26.2 au |
| Eccentricity | 0.461 |
| Inclination | 6.77° |
| Closest distance between its orbit and Earth's (MOID) | 8.66 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 13 December 1999
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