astro.wikisort.org - Asteroid
(85770) 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 | |
Alternative designations | 1998 UP1 |
Minor planet category | 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) |
Semi-major axis | 0.99826 AU (149.338 Gm) |
| Eccentricity | 0.34509 |
Orbital period (sidereal) | 1.00 yr (364.30 d) |
Mean anomaly | 193.86° |
Mean motion | 0° 59m 17.484s / day |
| Inclination | 33.180° |
Longitude of ascending node | 18.357° |
Argument of perihelion | 234.27° |
| Earth MOID | 0.0833366 AU (12.46698 Gm) |
| Physical characteristics | |
Mean diameter | 210–470 meters[3] |
Absolute magnitude (H) | 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 0.65–1.35 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 0.0255 AU (3,810,000 km; 2,370,000 mi) from Venus on 24 January 2115.[5]
References
- "MPEC 1998-U17 : 1998 UP1". IAU Minor Planet Center. 21 October 1998. Retrieved 28 February 2015. (J98U01P)
- "JPL Small-Body Database Browser: 85770 (1998 UP1)" (last observation: 2014-11-02; arc: 24 years). Jet Propulsion Laboratory. Archived from the original on 19 September 2020. Retrieved 7 April 2016.
- "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 28 February 2015.
- Rogers, John E. Coordinated Amateur Recovery of One-Opposition NEAs. The Minor Planet Amateur / Professional Workshop 2001. Camarillo Observatory.
- "JPL Close-Approach Data: 85770 (1998 UP1)" (last observation: 2014-11-02; arc: 24 years). Retrieved 28 February 2015.
External links
- MPEC 1998-U17
- MPEC 1999-T52
- (85770) = 1998 UP1 Orbit – Minor Planet Center
- (85770) 1998 UP1 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- (85770) 1998 UP1 at ESA–space situational awareness
- (85770) 1998 UP1 at the JPL Small-Body Database
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