+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   160555 (1998 RB1) Classification: Main-belt Asteroid          SPK-ID: 2160555 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .18350152962801 6.4981e-08   a 2.773049197218518 2.1992e-08 au q 2.264190427795195 1.8739e-07 au i 9.498328436643316 6.8133e-06 deg node 353.2242063897688 3.4331e-05 deg peri 5.915508238542714 3.7945e-05 deg M 300.3002230939258 2.1741e-05 deg tp 2459480.208069697182 (2021-Sep-22.70806970) 0.00010422 TDB period 1686.688130332696 4.62 2.0065e-05 5.493e-08 d yr n .2134360190991507 2.539e-09 deg/d Q 3.281907966641842 2.6027e-08 au   Orbit Determination Parameters    # obs. used (total)      586      data-arc span      7946 days (21.75 yr)      first obs. used      1998-09-12      last obs. used      2020-06-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .59272      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 20:01:50   Additional Information  Earth MOID = 1.25906 au   Jupiter MOID = 2.16938 au   T_jup = 3.292  [ 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 14.83   n/a E2021B55   160555 (1998 RB1)          Discovered 1998-Sep-12 by Kobayashi, T. at Oizumi Reference: 20070828/Numbers.arc Last Updated: 2007-08-30 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-17 13:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin