(85770) 1998 UP1
Discovery[1][2]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date18 October 1998
Designations
1998 UP1
NEO · Aten
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc8787 days (24.06 yr)
Aphelion1.3427 AU (200.87 Gm)
Perihelion0.65377 AU (97.803 Gm)
0.99826 AU (149.338 Gm)
Eccentricity0.34509
1.00 yr (364.30 d)
193.86°
0° 59m 17.484s / day
Inclination33.180°
18.357°
234.27°
Earth MOID0.0833366 AU (12.46698 Gm)
Physical characteristics
Mean diameter
210–470 meters[3]
20.5[2]

    (85770) 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°.[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]

    Animation of (85770) 1998 UP1 orbit from 1600 to 2500
    Relative to Sun and Earth
    Around Earth
    Around Sun
       Sun ·    Earth ·    (85770) 1998 UP1

    References

    1. 1 2 "MPEC 1998-U17 : 1998 UP1". IAU Minor Planet Center. 21 October 1998. Retrieved 28 February 2015. (J98U01P)
    2. 1 2 3 4 "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.
    3. ↑ "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 28 February 2015.
    4. ↑ Rogers, John E. Coordinated Amateur Recovery of One-Opposition NEAs. The Minor Planet Amateur / Professional Workshop 2001. Camarillo Observatory.
    5. ↑ "JPL Close-Approach Data: 85770 (1998 UP1)" (last observation: 2014-11-02; arc: 24 years). Retrieved 28 February 2015.


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