(12929) Periboea Jupiter Trojan
Discovered on 2 October 1999 by C. W. Juels at Fountain Hills.
Periboea was the grandmother of the Trojan ally Asteropaios and mother of Pelegon who she conceived by way of the river god Axius.Naming citation (WGSBN Bull. 1, #1, 11), IAU / Minor Planet Center, via NASA/JPL
Where Periboea is today
Seen from above the solar system on 2026-10-14: Periboea is 5.33 au from the Sun and 4.99 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12929 |
| Provisional designation | 1999 TZ1 |
| Orbit class | Jupiter Trojan |
| Diameter | 54.1 km (#666 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0660 |
| Rotation period | 9.27 hours |
| Absolute magnitude (H) | 10.07 |
| Orbital period | 12.0 years |
| Semi-major axis | 5.25 au |
| Perihelion – aphelion | 5.04 – 5.47 au |
| Eccentricity | 0.0409 |
| Inclination | 43.4° |
| Closest distance between its orbit and Earth's (MOID) | 4.09 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 2 October 1999
- (12935) Zhengzhemin
- (13406) Sekora
- (16087) Rhythmgarg
- (16094) Scottmccord
- (20629) Robert
- (20631) Stefuller
- (20632) Carlyrosser
- (20633) Robertluther
- (20634) Marichardson
- (20635) Robinandrews
- (20636) Romanhirsch
- (21801) Ancerl