+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103226 (1999 YH9) Classification: Inner Main-belt Asteroid          SPK-ID: 2103226 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05351933991583938 3.9082e-08   a 1.905738004793219 6.378e-09 au q 1.803744164724157 7.7184e-08 au i 22.53348044428418 4.6021e-06 deg node 115.1604629340218 9.0894e-06 deg peri 50.83857386081321 4.1068e-05 deg M 302.4502641975251 3.9131e-05 deg tp 2459354.115151199741 (2021-May-19.61515120) 0.00010442 TDB period 960.9332460137631 2.63 4.824e-06 1.321e-08 d yr n .3746358048213932 1.8807e-09 deg/d Q 2.007731844862281 6.7194e-09 au   Orbit Determination Parameters    # obs. used (total)      775      data-arc span      7692 days (21.06 yr)      first obs. used      1999-12-31      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51101      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:46   Additional Information  Earth MOID = .846309 au   Jupiter MOID = 3.08213 au   T_jup = 3.847  [ 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 16.3   n/a MPO474905   103226 (1999 YH9)          Discovered 1999-Dec-31 by Korlevic, K. at Visnjan Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-09 02:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin