(2209) Tianjin Main-belt Asteroid
Discovered on 28 October 1978 by Purple Mountain Observatory at Nanking.
Named for the largest port city in northern China, site of the latitude station of the Peking Observatory.Naming citation (MPC 6059), IAU / Minor Planet Center, via NASA/JPL
Where Tianjin is today
Seen from above the solar system on 2026-10-14: Tianjin is 2.68 au from the Sun and 1.71 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 2209 |
| Provisional designation | 1978 US1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 16.8 km (#2,730 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.354 |
| Rotation period | 9.47 hours |
| Absolute magnitude (H) | 11.34 |
| Orbital period | 4.80 years |
| Semi-major axis | 2.85 au |
| Perihelion – aphelion | 2.67 – 3.03 au |
| Eccentricity | 0.0633 |
| Inclination | 2.62° |
| Closest distance between its orbit and Earth's (MOID) | 1.68 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 28 October 1978
More named asteroids discovered by Purple Mountain Observatory
- (1125) China
- (1802) Zhang Heng
- (1888) Zu Chong-Zhi
- (1972) Yi Xing
- (2012) Guo Shou-Jing
- (2027) Shen Guo
- (2045) Peking
- (2077) Kiangsu
- (2078) Nanking
- (2085) Henan
- (2162) Anhui
- (2169) Taiwan
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