(21082) Araimasaru Main-belt Asteroid
Discovered on 13 October 1991 by Hioki, T., Hayakawa, S. at Okutama.
Masaru Arai (b. 1952) is a Japanese amateur astronomer. A devoted observer of small bodies, he has made an astrograph for automatic surveys and discovered the comet C/1991 A2 and 42 minor planets with H. Mori at Yorii.Naming citation (20030106/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Araimasaru is today
Seen from above the solar system on 2026-10-14: Araimasaru is 3.33 au from the Sun and 4.29 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21082 |
| Provisional designation | 1991 TG2 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 7.90 hours |
| Absolute magnitude (H) | 14.93 |
| Orbital period | 4.12 years |
| Semi-major axis | 2.57 au |
| Perihelion – aphelion | 1.78 – 3.36 au |
| Eccentricity | 0.306 |
| Inclination | 5.98° |
| Closest distance between its orbit and Earth's (MOID) | 0.793 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Masaru
All asteroids named after someone called Masaru