+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21890 (1999 UG50) Classification: Main-belt Asteroid          SPK-ID: 2021890 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04802072774335683 3.5556e-08   a 2.965600338567658 1.8163e-08 au q 2.823190052113693 1.111e-07 au i 10.69129619472223 4.6246e-06 deg node 71.32055103525578 2.9467e-05 deg peri 42.94461211546461 7.1298e-05 deg M 16.02846350853984 6.4546e-05 deg tp 2459313.446726844309 (2021-Apr-08.94672684) 0.0003343 TDB period 1865.380191939095 5.11 1.7137e-05 4.692e-08 d yr n .1929901483652905 1.773e-09 deg/d Q 3.108010625021622 1.9035e-08 au   Orbit Determination Parameters    # obs. used (total)      1191      data-arc span      12871 days (35.24 yr)      first obs. used      1986-03-04      last obs. used      2021-05-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53555      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 05:11:50   Additional Information  Earth MOID = 1.84995 au   Jupiter MOID = 2.02938 au   T_jup = 3.237  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.18   n/a MPCxxxxx   21890 (1999 UG50)          Discovered 1999-Oct-30 by CSS at Catalina Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-27 03:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin