+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100230 (1994 PN18) Classification: Main-belt Asteroid          SPK-ID: 2100230 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2021746036568995 6.7559e-08   a 3.090704656950146 1.9141e-08 au q 2.465842667910717 2.078e-07 au i 1.154680605494467 5.0659e-06 deg node 300.68154108 0.00032377 deg peri 75.77040588478705 0.00032406 deg M 242.3106152630005 1.2758e-05 deg tp 2459649.312903258810 (2022-Mar-10.81290326) 7.3374e-05 TDB period 1984.653464670041 5.43 1.8436e-05 5.048e-08 d yr n .1813918683581629 1.685e-09 deg/d Q 3.715566645989576 2.301e-08 au   Orbit Determination Parameters    # obs. used (total)      417      data-arc span      9003 days (24.65 yr)      first obs. used      1994-08-12      last obs. used      2019-04-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61405      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 07:37:51   Additional Information  Earth MOID = 1.46768 au   Jupiter MOID = 1.75696 au   T_jup = 3.193  [ 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 MPO436466   diameter diameter 4.233 km 1.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.068   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100230 (1994 PN18)          Discovered 1994-Aug-12 by Elst, E. W. at La Silla Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1994 PN18 = 2000 UR47  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-22 13:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin