+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74261 (1998 SO84) Classification: Main-belt Asteroid          SPK-ID: 2074261 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1928482075495439 4.8325e-08   a 2.34787051685154 1.2869e-08 au q 1.895087896118299 1.1314e-07 au i 6.15281123257207 5.4e-06 deg node 38.67341179464372 5.0267e-05 deg peri 191.60955400 5.2897e-05 deg M 117.664828667612 1.5744e-05 deg tp 2458571.009258472300 (2019-Mar-28.50925847) 5.7473e-05 TDB period 1314.043191162452 3.60 1.0804e-05 2.958e-08 d yr n .2739635975599329 2.2525e-09 deg/d Q 2.800653137584781 1.5351e-08 au   Orbit Determination Parameters    # obs. used (total)      914      data-arc span      10130 days (27.73 yr)      first obs. used      1991-10-06      last obs. used      2019-07-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57592      source      ORB      producer      Otto Matic      solution date      2020-Jan-29 11:47:07   Additional Information  Earth MOID = .885386 au   Jupiter MOID = 2.1911 au   T_jup = 3.527  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.4   n/a MPO432295   diameter diameter 4.940 km 1.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   geometric albedo albedo 0.046   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   74261 (1998 SO84)          Discovered 1998-Sep-26 by LINEAR at Socorro Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 SO84 = 2002 TS256  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-14 11:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin