(42985) Marsset Main-belt Asteroid
Discovered on 4 October 1999 by LONEOS at Anderson Mesa.
Michael Marsset (b. 1989) is a postdoctoral associate at MIT (Cambridge, MA). An expert in small solar system bodies, his research includes adaptive optics imaging, photometric colors, and spectroscopic measurements of asteroids and Trans-Neptunian Objects.Naming citation (WGSBN Bull. 1, #2, 23), IAU / Minor Planet Center, via NASA/JPL
Where Marsset is today
Seen from above the solar system on 2026-10-14: Marsset is 3.21 au from the Sun and 2.73 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 42985 |
| Provisional designation | 1999 TR230 |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.7 km (#4,729 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0440 |
| Rotation period | 70.6 hours |
| Absolute magnitude (H) | 14.07 |
| Orbital period | 5.62 years |
| Semi-major axis | 3.16 au |
| Perihelion – aphelion | 2.55 – 3.77 au |
| Eccentricity | 0.192 |
| Inclination | 9.77° |
| Closest distance between its orbit and Earth's (MOID) | 1.59 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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