(21727) Rhines Main-belt Asteroid
Discovered on 9 September 1999 by LINEAR at Socorro.
Allison Shelton Rhines (b. 1988) was awarded second place in the 2005 Intel International Science and Engineering Fair for her medicine and health project. She attends the Oregon Episcopal School, Portland, Oregon, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Rhines is today
Seen from above the solar system on 2026-10-14: Rhines is 2.74 au from the Sun and 3.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21727 |
| Provisional designation | 1999 RY135 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.14 km (#16,870 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.387 |
| Absolute magnitude (H) | 15.23 |
| Orbital period | 3.55 years |
| Semi-major axis | 2.33 au |
| Perihelion – aphelion | 1.91 – 2.74 au |
| Eccentricity | 0.178 |
| Inclination | 7.31° |
| Closest distance between its orbit and Earth's (MOID) | 0.938 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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