+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (1998 XD12) Classification: Apollo [NEO, PHA]          SPK-ID: 3016524 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2451166.5 (1998-Dec-19.0) TDB Reference: JPL 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6239587858885607 0.0011373   a 1.398972866053427 0.0030598 au q .5260714550596908 0.00044099 au i 13.52589324785474 0.030216 deg node 259.9825234708298 0.0043969 deg peri 69.27581985909025 0.013969 deg M 38.74817197951362 0.15882 deg tp 2451101.447935867460 (1998-Oct-14.94793587) 0.053225 TDB period 604.3831719363695 1.65 1.9829 0.005429 d yr n .5956486161694479 0.0019542 deg/d Q 2.271874277047164 0.004969 au   Orbit Determination Parameters    # obs. used (total)      60      data-arc span      10 days      first obs. used      1998-12-14      last obs. used      1998-12-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      8      norm. resid. RMS      .51991      source      ORB      producer      Otto Matic      solution date      2017-Apr-06 09:17:35   Additional Information  Earth MOID = .0321523 au   Jupiter MOID = 3.19472 au   T_jup = 4.507  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 20.7   n/a MPO57682   [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Jan-18 18:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin