+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16379 (1981 EJ18) Classification: Main-belt Asteroid          SPK-ID: 2016379 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1328788437442783 3.2008e-08   a 3.15424552105535 1.7339e-08 au q 2.735113023331947 9.8661e-08 au i 4.594309815494281 5.0909e-06 deg node 341.5949855167669 4.5821e-05 deg peri 107.0028729663138 5.1156e-05 deg M 68.37657905739337 2.051e-05 deg tp 2458611.860859022737 (2019-May-08.36085902) 0.00011643 TDB period 2046.169794987523 5.60 1.6872e-05 4.619e-08 d yr n .1759384782640656 1.4508e-09 deg/d Q 3.573378018778754 1.9644e-08 au   Orbit Determination Parameters    # obs. used (total)      1251      data-arc span      14353 days (39.30 yr)      first obs. used      1981-02-02      last obs. used      2020-05-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52527      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:27:43   Additional Information  Earth MOID = 1.75611 au   Jupiter MOID = 1.6359 au   T_jup = 3.188  [ 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 14.1   n/a MPO324461   diameter diameter 9.276 km 0.241 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.057   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   16379 (1981 EJ18)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1981 EJ18 = 1998 FN141  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 23:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin