+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243641 (1999 TN61) Classification: Main-belt Asteroid          SPK-ID: 2243641 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05787566571467528 4.864e-08   a 2.549698638957693 2.1048e-08 au q 2.402133132856215 1.3008e-07 au i 13.78718592773089 8.7995e-06 deg node 357.8697597051101 1.8409e-05 deg peri 274.6675796676184 0.0001208 deg M 108.7673593985582 0.00011276 deg tp 2458551.208927288499 (2019-Mar-08.70892729) 0.00046639 TDB period 1487.071002463671 4.07 1.8414e-05 5.041e-08 d yr n .2420866249180962 2.9977e-09 deg/d Q 2.697264145059171 2.2266e-08 au   Orbit Determination Parameters    # obs. used (total)      227      data-arc span      6773 days (18.54 yr)      first obs. used      1999-10-07      last obs. used      2018-04-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65252      source      ORB      producer      Otto Matic      solution date      2018-May-07 06:25:56   Additional Information  Earth MOID = 1.43432 au   Jupiter MOID = 2.40378 au   T_jup = 3.398  [ 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 16.1   n/a MPO437137   243641 (1999 TN61)          Discovered 1999-Oct-07 by Spacewatch at Kitt Peak Reference: 20100726/Numbers.arc Last Updated: 2010-07-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-25 07:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin