+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74984 (1999 TW248) Classification: Main-belt Asteroid          SPK-ID: 2074984 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07873610292063017 4.2276e-08   a 2.288993923730084 9.3655e-09 au q 2.108767462566575 9.7835e-08 au i 7.013729387336327 4.7646e-06 deg node 184.5899260884613 3.4377e-05 deg peri 236.2646149948294 4.4929e-05 deg M 330.734311809477 3.0371e-05 deg tp 2459103.330424098520 (2020-Sep-10.83042410) 0.00010696 TDB period 1264.926778228129 3.46 7.7632e-06 2.125e-08 d yr n .284601453772903 1.7467e-09 deg/d Q 2.469220384893593 1.0103e-08 au   Orbit Determination Parameters    # obs. used (total)      929      data-arc span      7329 days (20.07 yr)      first obs. used      1999-10-08      last obs. used      2019-11-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54903      source      ORB      producer      Otto Matic      solution date      2020-Feb-23 17:25:18   Additional Information  Earth MOID = 1.12921 au   Jupiter MOID = 2.75154 au   T_jup = 3.586  [ 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 15.4   n/a MPO493393   74984 (1999 TW248)          Discovered 1999-Oct-08 by CSS at Catalina Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-02 12:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin