+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100539 (1997 EN13) Classification: Main-belt Asteroid          SPK-ID: 2100539 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1282324287109301 5.6366e-08   a 3.068756231096181 3.2866e-08 au q 2.675242166460917 1.8427e-07 au i 5.974198218312041 6.5756e-06 deg node 320.1100619899995 5.1179e-05 deg peri 31.50096688502528 5.6394e-05 deg M 277.7039687503403 2.7215e-05 deg tp 2459449.367751258386 (2021-Aug-22.86775126) 0.00015204 TDB period 1963.550222279852 5.38 3.1544e-05 8.636e-08 d yr n .1833413762047852 2.9453e-09 deg/d Q 3.462270295731444 3.708e-08 au   Orbit Determination Parameters    # obs. used (total)      349      data-arc span      8088 days (22.14 yr)      first obs. used      1997-03-03      last obs. used      2019-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5905      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 05:31:56   Additional Information  Earth MOID = 1.67144 au   Jupiter MOID = 1.96381 au   T_jup = 3.211  [ 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 15.3   n/a MPO436468   diameter diameter 3.057 km 0.651 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.157   0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100539 (1997 EN13)          Discovered 1997-Mar-03 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1997 EN13 = 2000 UL97  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-27 11:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin