+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103205 (1999 XJ252) Classification: Main-belt Asteroid          SPK-ID: 2103205 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .160752167608118 4.0818e-08   a 3.064315089715321 1.9019e-08 au q 2.571719796809319 1.2844e-07 au i 2.30320313093208 4.0586e-06 deg node 108.4384517815944 0.00012536 deg peri 62.65471791626767 0.00012621 deg M 279.5764295487759 1.6192e-05 deg tp 2459638.202881572606 (2022-Feb-27.70288157) 9.0157e-05 TDB period 1959.289254158447 5.36 1.8241e-05 4.994e-08 d yr n .1837400982197634 1.7106e-09 deg/d Q 3.556910382621324 2.2076e-08 au   Orbit Determination Parameters    # obs. used (total)      663      data-arc span      22027 days (60.31 yr)      first obs. used      1960-09-26      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52997      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:41   Additional Information  Earth MOID = 1.57828 au   Jupiter MOID = 1.41045 au   T_jup = 3.212  [ 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 15.0   n/a MPO453484   diameter diameter 3.844 km 0.910 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.109   0.085 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   103205 (1999 XJ252)          Discovered 1999-Dec-09 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 XJ252 = 2000 AU255 = 2001 HD4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 02:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin