| Discovered by 1998-10-18 by LINEAR Alternative names (85770) Observation arc 8787 days (24.06 yr) Discovered 18 October 1998 Orbits Sun Asteroid group Aten asteroid | Discovery date 18 October 1998 Minor planet category Aten Aphelion 1.3427 AU (200.87 Gm) Inclination 33.18° Discovery site Socorro | |
| Discoverer Lincoln Near-Earth Asteroid Research Similar Sun, Solar System, 54509 YORP, 2002 AA29, 2003 YN107 | ||
1998 UP1 is a near Earth, Aten asteroid orbiting at nearly a 1:1 resonance with Earth.
Orbit
With an orbital period of 364.3 days, 1998 UP1 is in a near 1:1 orbital resonance with Earth. Although their periods are almost identical, their orbits are very different; 1998 UP1 has a highly eccentric orbit and moves between 0.65 – 1.35 AU from the Sun, it is also very highly inclined at 33°. The preliminary period of 1998 UP1 was originally thought to be slightly longer than 1 year producing an error in the predicted position of about 35 degrees; it was selected as a priority for recovery and recovered by the Camarillo Observatory on 12 October 1999.
1998 UP1 also makes close approaches to Venus and will pass 0.0255 AU (3,810,000 km; 2,370,000 mi) from Venus on 24 January 2115.