+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100601 (1997 RF4) Classification: Main-belt Asteroid          SPK-ID: 2100601 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1780742188408607 3.7478e-08   a 2.835150137966041 1.851e-08 au q 2.33028299185118 1.0665e-07 au i 8.065973343248684 5.3096e-06 deg node 26.65103836446425 2.8576e-05 deg peri 294.4981912149397 3.2279e-05 deg M 317.6509159824013 1.6321e-05 deg tp 2459205.618126360740 (2020-Dec-22.11812636) 8.0199e-05 TDB period 1743.662872594365 4.77 1.7076e-05 4.675e-08 d yr n .2064619288844307 2.0219e-09 deg/d Q 3.340017284080902 2.1806e-08 au   Orbit Determination Parameters    # obs. used (total)      771      data-arc span      7902 days (21.63 yr)      first obs. used      1997-09-04      last obs. used      2019-04-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59475      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 04:06:38   Additional Information  Earth MOID = 1.33235 au   Jupiter MOID = 2.05293 au   T_jup = 3.274  [ 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 14.7   n/a MPO344985   diameter diameter 3.895 km 0.820 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.202   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100601 (1997 RF4)          Discovered 1997-Sep-04 by ODAS at Caussols Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-21 20:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin