+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   160391 (2004 NJ20) Classification: Main-belt Asteroid          SPK-ID: 2160391 [ 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 .2229601879393077 6.0003e-08   a 2.467735571813951 1.7106e-08 au q 1.917528784937797 1.4589e-07 au i 13.16399638179437 5.233e-06 deg node 136.4349426200286 2.216e-05 deg peri 93.66408803934749 2.7174e-05 deg M 82.40123379599032 1.3155e-05 deg tp 2458676.401088357881 (2019-Jul-11.90108836) 5.2634e-05 TDB period 1415.944917524283 3.88 1.4723e-05 4.031e-08 d yr n .2542471783644267 2.6436e-09 deg/d Q 3.017942358690104 2.092e-08 au   Orbit Determination Parameters    # obs. used (total)      543      data-arc span      6888 days (18.86 yr)      first obs. used      2001-09-19      last obs. used      2020-07-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53428      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 12:19:24   Additional Information  Earth MOID = .960911 au   Jupiter MOID = 2.13171 au   T_jup = 3.416  [ 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 16.4   n/a MPO475383   diameter diameter 2.744 km 0.859 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   geometric albedo albedo 0.042   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   160391 (2004 NJ20)          Discovered 2004-Jul-14 by LINEAR at Socorro Reference: 20070730/Numbers.arc Last Updated: 2007-08-06 [ show close-approach data ] Alternate Designations  2004 NJ20 = 2001 SD352  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-25 06:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin