+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101231 (1998 SZ74) Classification: Main-belt Asteroid          SPK-ID: 2101231 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2039498700337447 3.111e-08   a 2.662678460860442 1.0878e-08 au q 2.119625534826303 8.3474e-08 au i 3.446956977047763 3.8103e-06 deg node 119.8747422608871 5.8861e-05 deg peri 201.9996259030223 5.9903e-05 deg M 79.97624245901653 1.0257e-05 deg tp 2458847.938399064418 (2019-Dec-30.43839906) 4.4333e-05 TDB period 1586.998493982135 4.34 9.7256e-06 2.663e-08 d yr n .2268433154568907 1.3902e-09 deg/d Q 3.20573138689458 1.3097e-08 au   Orbit Determination Parameters    # obs. used (total)      849      data-arc span      8700 days (23.82 yr)      first obs. used      1997-04-06      last obs. used      2021-01-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49826      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:35:49   Additional Information  Earth MOID = 1.1055 au   Jupiter MOID = 2.1194 au   T_jup = 3.352  [ 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 15.7   n/a MPO436472   diameter diameter 4.041 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.061   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101231 (1998 SZ74)          Discovered 1998-Sep-21 by Elst, E. W. at La Silla Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1998 SZ74 = 2019 RV47  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 02:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin