(11885) Summanus Apollo
Discovered on 25 September 1990 by Spacewatch at Kitt Peak.
Summanus was the Etruscan or Roman deity responsible for nocturnal lightning and thunder, as Jupiter was in daytime. This was the first earth-approacher discovered automatically by software and (lightning-fast) electronic computer; J. V. Scotti used D. L. Rabinowitz's Moving Object Detection Program at the telescope.Naming citation (20100923/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Summanus is today
Seen from above the solar system on 2026-10-14: Summanus is 1.07 au from the Sun and 2.03 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 11885 |
| Provisional designation | 1990 SS |
| Orbit class | Apollo · near-Earth |
| Diameter | 1.30 km (#17,392 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0330 |
| Rotation period | 7.37 hours |
| Absolute magnitude (H) | 18.52 |
| Orbital period | 2.22 years |
| Semi-major axis | 1.70 au |
| Perihelion – aphelion | 0.895 – 2.51 au |
| Eccentricity | 0.475 |
| Inclination | 19.4° |
| Closest distance between its orbit and Earth's (MOID) | 0.0671 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.