+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120445 (1981 EU16) Classification: Main-belt Asteroid          SPK-ID: 2120445 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1827236974005077 3.291e-08   a 2.351226891595743 8.8595e-09 au q 1.921602020535867 7.8185e-08 au i 4.625847321968251 4.5495e-06 deg node 325.588073179796 5.35e-05 deg peri 141.3359078995358 5.596e-05 deg M 61.34980934039822 1.5355e-05 deg tp 2458976.085479608942 (2020-May-06.58547961) 5.5694e-05 TDB period 1316.86191382476 3.61 7.443e-06 2.038e-08 d yr n .2733771826951831 1.5451e-09 deg/d Q 2.780851762655621 1.0478e-08 au   Orbit Determination Parameters    # obs. used (total)      617      data-arc span      14295 days (39.14 yr)      first obs. used      1981-02-12      last obs. used      2020-04-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50685      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 17:57:07   Additional Information  Earth MOID = .940724 au   Jupiter MOID = 2.34682 au   T_jup = 3.531  [ 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 16.50   n/a E2021B55   diameter diameter 3.036 km 0.226 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.044   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120445 (1981 EU16)          Discovered 1981-Mar-06 by Bus, S. J. at Siding Spring Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1981 EU16 = 1999 FN59  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 19:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin