(31129) Langyatai Main-belt Asteroid
Discovered on 26 September 1997 by Beijing Schmidt CCD Asteroid Program at Xinglong.
Langyatai, a three-story platform with a perimeter of several kilometers, was built along the Langya Mountain and beside the Yellow Sea with rammed earth more than 2,200 years ago. As the existing most ancient observatory of China, Langyatai is listed among the first batch of national key scenic spots.Naming citation (MPC batch dated 2015-01-05), IAU / Minor Planet Center, via NASA/JPL
Where Langyatai is today
Seen from above the solar system on 2026-10-14: Langyatai is 2.74 au from the Sun and 1.87 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31129 |
| Provisional designation | 1997 SR10 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 3.16 hours |
| Absolute magnitude (H) | 14.51 |
| Orbital period | 4.08 years |
| Semi-major axis | 2.55 au |
| Perihelion – aphelion | 2.19 – 2.92 au |
| Eccentricity | 0.143 |
| Inclination | 12.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.21 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.