(27740) Obatomoyuki Main-belt Asteroid
Discovered on 20 October 1990 by T. Seki at Geisei.
Tomoyuki Oba (b. 1965) is from Konan city, Kochi prefecture. He helps visitors as a presenter at Geisei Observatory, while teaching junior high school.Naming citation (20070402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Obatomoyuki is today
Seen from above the solar system on 2026-10-14: Obatomoyuki is 2.21 au from the Sun and 3.11 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 27740 |
| Provisional designation | 1990 UC1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.74 km (#11,147 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0700 |
| Absolute magnitude (H) | 14.69 |
| Orbital period | 3.71 years |
| Semi-major axis | 2.39 au |
| Perihelion – aphelion | 1.87 – 2.91 au |
| Eccentricity | 0.217 |
| Inclination | 10.3° |
| Closest distance between its orbit and Earth's (MOID) | 0.883 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.