+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   215131 (1999 RH237) Classification: Main-belt Asteroid          SPK-ID: 2215131 [ 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 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2493404128119714 6.2411e-08   a 2.345747485853938 8.8071e-09 au q 1.760857839378473 1.4724e-07 au i 5.669785971322804 4.1101e-06 deg node 82.26429127612163 6.8785e-05 deg peri 274.6143113146081 6.9238e-05 deg M 275.6157503410446 7.5884e-06 deg tp 2459308.094955195409 (2021-Apr-03.59495520) 2.7967e-05 TDB period 1312.261284752629 3.59 7.3904e-06 2.023e-08 d yr n .2743356099756176 1.545e-09 deg/d Q 2.930637132329402 1.1003e-08 au   Orbit Determination Parameters    # obs. used (total)      383      data-arc span      9629 days (26.36 yr)      first obs. used      1992-11-21      last obs. used      2019-04-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50957      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 07:22:48   Additional Information  Earth MOID = .768046 au   Jupiter MOID = 2.5356 au   T_jup = 3.512  [ 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 16.8   n/a MPO433407   215131 (1999 RH237)          Discovered 1999-Sep-08 by CSS at Catalina Reference: 20090607/Numbers.arc Last Updated: 2009-06-08 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-14 15:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin