+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   48399 (1981 EA21) Classification: Main-belt Asteroid          SPK-ID: 2048399 [ 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 .04220216548717292 3.8136e-08   a 2.808698455512781 1.4751e-08 au q 2.690165298489664 1.0608e-07 au i .8195950264916148 3.7341e-06 deg node 314.7511645770579 0.00030361 deg peri 219.2014677301078 0.00030728 deg M 124.2756280771224 4.6355e-05 deg tp 2458406.974249336397 (2018-Oct-15.47424934) 0.00022195 TDB period 1719.317564875225 4.71 1.3545e-05 3.708e-08 d yr n .2093854022983393 1.6495e-09 deg/d Q 2.927231612535899 1.5374e-08 au   Orbit Determination Parameters    # obs. used (total)      1002      data-arc span      14020 days (38.38 yr)      first obs. used      1981-02-09      last obs. used      2019-06-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54033      source      ORB      producer      Otto Matic      solution date      2020-Feb-23 09:05:57   Additional Information  Earth MOID = 1.69445 au   Jupiter MOID = 2.03596 au   T_jup = 3.321  [ 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 14.9   n/a MPO257193   48399 (1981 EA21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring Reference: 20021120/Numbers.arc Last Updated: 2004-04-19 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1902-Mar-26 15:06 00:06 Iris 0.0329371239377203 0.0329252517786575 0.0329489973535869 3.80927034302729 3.80927029720829 2415835.129065500 6.28078345438816 673.483185873792 50.7991343321852 -28.626837792382 46883.0450998648 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06 1972-Nov-14 04:25 00:07 Hygie 0.0481564481973892 0.0481523377378879 0.0481605587132826 1.40754848780612 1.40754791779319 2441635.683783839 7.1752345091667 218.612665035563 29.1495908105536 -22.4058592669321 97610.2778300538 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06 1976-Aug-15 10:28 00:02 Amphi 0.0382596223208188 0.0382572829108159 0.0382619622243693 2.04055317609635 2.04055310246132 2443005.936241559 2.07294472626004 254.122248214354 33.6842856495691 63.7474602174284 152417.008493823 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06 2184-Jun-12 15:24 00:32 Hygie 0.046206574984345 0.0461868936125787 0.0462262593867616 1.49113908846219 1.49113852769761 2518913.141423178 32.3753131125643 1134.71938125058 33.9938583411032 -31.1215725336507 103903.641520438 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06 Alternate Designations  1981 EA21 = 2000 GQ29  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-15 17:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin