+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102528 (1999 US3) Classification: Mars-crossing Asteroid          SPK-ID: 2102528 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5199516987077153 5.2509e-08   a 2.760522889268379 1.4081e-08 au q 1.325184323671755 1.4762e-07 au i 29.0613403008722 6.6237e-06 deg node 268.2023952259342 1.1654e-05 deg peri 181.8912817567056 1.4628e-05 deg M 170.2008642111008 1.3206e-05 deg tp 2458208.464375710894 (2018-Mar-30.96437571) 5.5574e-05 TDB period 1675.272485047001 4.59 1.2818e-05 3.509e-08 d yr n .2148904152687137 1.6442e-09 deg/d Q 4.195861454865003 2.1403e-08 au   Orbit Determination Parameters    # obs. used (total)      1524      data-arc span      9126 days (24.99 yr)      first obs. used      1994-07-11      last obs. used      2019-07-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .3693      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:54:14   Additional Information  Earth MOID = .341836 au   Jupiter MOID = 1.0576 au   T_jup = 2.973  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6   n/a MPO257480   diameter diameter 12.850 km 3.837 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 4.682 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Koff, R.A. (2000) Minor Planet Bull. 27, 19-20.] [Krugly, Yu.N.; Bel'skaya, I.N.; Shevchenko, V.G.; et al. (2002) Icarus 158, 294-304.] geometric albedo albedo 0.041   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   102528 (1999 US3)          Discovered 1999-Oct-26 by LONEOS at Anderson Mesa Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 US3 = 1999 TC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-02 09:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin