(18776) Coulter Main-belt Asteroid
Discovered on 10 May 1999 by LINEAR at Socorro.
Michael Edward Coulter (b. 1986) was awarded third place in the 2003 Intel International Science and Engineering Fair for his engineering project. He attends the Oregon Episcopal School, Portland, Oregon, U.S.A.Naming citation (20040830/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Coulter is today
Seen from above the solar system on 2026-10-14: Coulter is 2.19 au from the Sun and 2.53 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18776 |
| Provisional designation | 1999 JP39 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.27 km (#14,562 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.281 |
| Rotation period | 3.13 hours |
| Absolute magnitude (H) | 14.8 |
| Orbital period | 3.36 years |
| Semi-major axis | 2.24 au |
| Perihelion – aphelion | 1.86 – 2.62 au |
| Eccentricity | 0.169 |
| Inclination | 1.05° |
| Closest distance between its orbit and Earth's (MOID) | 0.862 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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