+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5184427644907427 4.4764e-08   a 2.76327090718293 1.1566e-08 au q 1.330673099026169 1.2732e-07 au i 28.99603424873935 4.6408e-06 deg node 268.1871140098119 2.5265e-06 deg peri 181.9008730608372 5.1565e-06 deg M 213.1236372488315 1.1804e-05 deg tp 2459885.015098887318 (2022-Nov-01.51509889) 5.9224e-05 TDB period 1677.774632919781 4.59 1.0534e-05 2.884e-08 d yr n .2145699386177408 1.3472e-09 deg/d Q 4.19586871533969 1.7563e-08 au   Orbit Determination Parameters    # obs. used (total)      1561      data-arc span      9126 days (24.99 yr)      first obs. used      1994-07-11      last obs. used      2019-07-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .38138      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:42:24   Additional Information  Earth MOID = .347036 au   Jupiter MOID = 1.05811 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 13.63   n/a MPCxxxxx   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-May-17 01:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin