+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102278 (1999 TH55) Classification: Main-belt Asteroid          SPK-ID: 2102278 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1427029149227478 5.3309e-08   a 2.586342306453703 1.1943e-08 au q 2.217263720334737 1.4185e-07 au i 3.483872862417354 4.7735e-06 deg node 18.54909363225187 7.3547e-05 deg peri 78.39525998822515 7.5332e-05 deg M 334.8845152628315 1.508e-05 deg tp 2459306.490391557723 (2021-Apr-01.99039156) 6.362e-05 TDB period 1519.243660239308 4.16 1.0523e-05 2.881e-08 d yr n .2369600146584082 1.6414e-09 deg/d Q 2.95542089257267 1.3648e-08 au   Orbit Determination Parameters    # obs. used (total)      389      data-arc span      7771 days (21.28 yr)      first obs. used      1999-10-06      last obs. used      2021-01-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55392      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:31:00   Additional Information  Earth MOID = 1.237 au   Jupiter MOID = 2.20714 au   T_jup = 3.405  [ 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 16.5   n/a MPO449618   102278 (1999 TH55)          Discovered 1999-Oct-06 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 11:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin