+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18014 (1999 JC121) Classification: Main-belt Asteroid          SPK-ID: 2018014 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09847430848220567 4.4228e-08   a 3.014862393015288 1.9573e-08 au q 2.7179759036941 1.4148e-07 au i 8.414386509521945 4.4383e-06 deg node 99.8386086105981 3.1807e-05 deg peri 263.1196739410969 3.9081e-05 deg M 256.6844797755945 2.4026e-05 deg tp 2459549.235092172428 (2021-Nov-30.73509217) 0.00012924 TDB period 1912.051865518358 5.23 1.862e-05 5.098e-08 d yr n .1882794115014259 1.8335e-09 deg/d Q 3.311748882336477 2.1501e-08 au   Orbit Determination Parameters    # obs. used (total)      1163      data-arc span      9924 days (27.17 yr)      first obs. used      1993-04-16      last obs. used      2020-06-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57511      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 18:18:05   Additional Information  Earth MOID = 1.73167 au   Jupiter MOID = 2.14934 au   T_jup = 3.225  [ 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 14.0   n/a MPO474005   diameter diameter 5.305 km 0.199 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.300   0.095 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18014 (1999 JC121)          Discovered 1999-May-13 by LINEAR at Socorro Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 JC121 = 1998 FC94  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-01 21:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin