+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15685 (1981 EU33) Classification: Main-belt Asteroid          SPK-ID: 2015685 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1361574752731962 3.0355e-08   a 2.354082720709606 9.7855e-09 au q 2.033556760873529 7.1281e-08 au i 5.696965275018358 3.6746e-06 deg node 233.9812174544593 3.2377e-05 deg peri 106.0543315629607 3.5191e-05 deg M 257.8043676591754 1.6043e-05 deg tp 2459771.007777008410 (2022-Jul-10.50777701) 6.0298e-05 TDB period 1319.261857232713 3.61 8.2259e-06 2.252e-08 d yr n .2728798668940046 1.7015e-09 deg/d Q 2.674608680545683 1.1118e-08 au   Orbit Determination Parameters    # obs. used (total)      1308      data-arc span      16193 days (44.33 yr)      first obs. used      1977-02-11      last obs. used      2021-06-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50808      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 17:30:09   Additional Information  Earth MOID = 1.03336 au   Jupiter MOID = 2.70578 au   T_jup = 3.536  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.13   n/a MPCxxxxx   15685 (1981 EU33)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring Reference: 20000726/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-30 17:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin