(8355) Masuo Mars-crossing Asteroid
Discovered on 5 September 1989 by E. F. Helin at Palomar.
Infrared astronomer Masuo Tanaka (b. 1955) is a researcher at the Institute of Astronomy, University of Tokyo. His research interests include excitation of infrared molecular hydrogen emission, ices in molecular clouds, final-stage evolution of massive stars, and mass loss from massive stars.Naming citation (20120703/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Masuo is today
Seen from above the solar system on 2026-10-14: Masuo is 2.92 au from the Sun and 3.61 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8355 |
| Provisional designation | 1989 RQ1 |
| Orbit class | Mars-crossing Asteroid |
| Diameter | 3.87 km (#13,051 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.277 |
| Rotation period | 6.07 hours |
| Absolute magnitude (H) | 14.42 |
| Orbital period | 3.57 years |
| Semi-major axis | 2.34 au |
| Perihelion – aphelion | 1.66 – 3.01 au |
| Eccentricity | 0.288 |
| Inclination | 7.71° |
| Closest distance between its orbit and Earth's (MOID) | 0.659 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 5 September 1989
More named asteroids discovered by E. F. Helin
- (1982) Cline
- (2048) Dwornik
- (2050) Francis
- (2062) Aten
- (2074) Shoemaker
- (2083) Smither
- (2099) Opik
- (2100) Ra-Shalom
- (2128) Wetherill
- (2143) Jimarnold
- (2220) Hicks
- (2335) James
← (8353) Megryan · (8356) Wadhwa →