+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101590 (1999 BU20) Classification: Main-belt Asteroid          SPK-ID: 2101590 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08937555037095982 4.9661e-08   a 2.481905293628233 1.1614e-08 au q 2.260083642041611 1.1921e-07 au i 5.55549889427209 5.4978e-06 deg node 326.0536725652391 3.7018e-05 deg peri 158.1301356300137 4.8867e-05 deg M 158.0217843378555 3.3165e-05 deg tp 2458373.610933323067 (2018-Sep-12.11093332) 0.00012878 TDB period 1428.157927398068 3.91 1.0024e-05 2.744e-08 d yr n .2520729627261019 1.7693e-09 deg/d Q 2.703726945214855 1.2652e-08 au   Orbit Determination Parameters    # obs. used (total)      975      data-arc span      7919 days (21.68 yr)      first obs. used      1998-12-17      last obs. used      2020-08-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56232      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:59:40   Additional Information  Earth MOID = 1.27644 au   Jupiter MOID = 2.33818 au   T_jup = 3.466  [ 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 15.5   n/a MPO337993   101590 (1999 BU20)          Discovered 1999-Jan-16 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1951-Nov-25 19:01 < 00:01 Eunom 0.0421451567213303 0.0421388904368079 0.0421514250238735 4.52045058943841 4.52045051575589 2433976.292023021 0.627761132887347 560.719830236379 51.1657805365514 -56.5238376168557 102884.304858237 T 23 CATAB v2.0f-lin.ifort 2020-Nov-12 19:59:41 2020-Nov-12 19:59 1994-Nov-26 09:48 < 00:01 Eunom 0.0491887752698162 0.0491858716669728 0.0491916789022126 4.44760301953311 4.44760295536757 2449682.908594465 0.497663208481853 158.096879698456 48.8274706234808 -25.0987057477753 76505.1132779704 T 23 CATAB v2.0f-lin.ifort 2020-Nov-12 19:59:41 2020-Nov-12 19:59 2037-Nov-20 22:32 < 00:01 Eunom 0.038250198437287 0.0382452366569124 0.0382551605399802 5.00128065479354 5.00128058141333 2465383.438661330 0.508076932547728 305.382508572128 53.1223881168005 36.5721531904806 65876.0394249751 T 23 CATAB v2.0f-lin.ifort 2020-Nov-12 19:59:41 2020-Nov-12 19:59 2149-Aug-22 04:53 00:08 Psych 0.0271398552162904 0.0271373800889654 0.0271423381454289 3.42361354791931 3.42361341770435 2506199.703642856 7.71344084330169 1051.11726024876 88.868198621887 -85.3084054306633 45477.5170243017 T 23 CATAB v2.0f-lin.ifort 2020-Nov-12 19:59:41 2020-Nov-12 19:59 Alternate Designations  1999 BU20 = 2001 RO84  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 09:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin