(85770) 1998 UP1
Near-Earth asteroid
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(85770) 1998 UP1 (provisional designation 1998 UP1) is a near-Earth, Aten asteroid orbiting at nearly a 1:1 resonance with Earth.
| Discovery[1][2] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 18 October 1998 |
| Designations | |
| 1998 UP1 | |
| NEO · Aten | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 8787 days (24.06 yr) |
| Aphelion | 1.3427 AU (200.87 Gm) |
| Perihelion | 0.65377 AU (97.803 Gm) |
| 0.99826 AU (149.338 Gm) | |
| Eccentricity | 0.34509 |
| 1.00 yr (364.30 d) | |
| 193.86° | |
| 0° 59m 17.484s / day | |
| Inclination | 33.180° |
| 18.357° | |
| 234.27° | |
| Earth MOID | 0.0833366 AU (12.46698 Gm) |
| Physical characteristics | |
| 210â470 meters[3] | |
| 20.5[2] | |
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 0.65â1.35 AU from the Sun, it is also very highly inclined at 33°.[2] The preliminary period of 1998 UP1 was originally thought to be slightly longer than 1 year[1] 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.[4]
1998 UP1 also makes close approaches to Venus and will pass at a nominal distance of 0.02563 AU (3,830,000 km; 2,380,000 mi) from Venus at 19:13 hours on 24 January 2115.[5]
_1998_UP1_orbit.gif)
_1998_UP1_orbit_around_Earth.gif)
_1998_UP1_orbit_around_Sun.gif)
