+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2492262727479878 4.9048e-08   a 2.346309844813269 8.7284e-09 au q 1.761547787478548 1.17e-07 au i 5.66858807177832 4.0257e-06 deg node 82.26082231622682 5.3195e-05 deg peri 274.5376579455793 5.3818e-05 deg M 330.5302737871171 7.6406e-06 deg tp 2459307.960800514334 (2021-Apr-03.46080051) 2.7984e-05 TDB period 1312.733206467603 3.59 7.3252e-06 2.006e-08 d yr n .2742369875511215 1.5303e-09 deg/d Q 2.93107190214799 1.0904e-08 au   Orbit Determination Parameters    # obs. used (total)      429      data-arc span      10097 days (27.64 yr)      first obs. used      1992-11-21      last obs. used      2020-07-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49415      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 23:49:29   Additional Information  Earth MOID = .767066 au   Jupiter MOID = 2.53585 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 16.91   n/a E2021B55   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 ] 2021-Apr-14 09:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin