+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20145 (1996 SS4) Classification: Main-belt Asteroid          SPK-ID: 2020145 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0606282186256203 3.8317e-08   a 2.353710928291156 7.9512e-09 au q 2.211009627549208 9.0314e-08 au i 3.747870551003844 4.189e-06 deg node 202.0210906325765 3.9393e-05 deg peri 10.83732446701922 4.7e-05 deg M 61.84529771133701 2.4098e-05 deg tp 2458973.914405124012 (2020-May-04.41440512) 8.8731e-05 TDB period 1318.949332835091 3.61 6.6834e-06 1.83e-08 d yr n .2729445256446488 1.3831e-09 deg/d Q 2.496412229033104 8.4333e-09 au   Orbit Determination Parameters    # obs. used (total)      1615      data-arc span      9207 days (25.21 yr)      first obs. used      1995-06-22      last obs. used      2020-09-05      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49816      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:14:12   Additional Information  Earth MOID = 1.20369 au   Jupiter MOID = 2.46414 au   T_jup = 3.550  [ 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 15.07   n/a E2021B10   diameter diameter 3.235 km 0.278 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.128   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20145 (1996 SS4)          Discovered 1996-Sep-20 by Beijing Schmidt CCD Asteroid Program at Xinglong Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1996 SS4 = 1995 MT4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 13:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin