+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   117239 (2004 SM18) Classification: Outer Main-belt Asteroid          SPK-ID: 2117239 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1067748563731253 4.0391e-08   a 3.211012026359488 2.5573e-08 au q 2.868156678432576 1.2174e-07 au i 3.886029391769831 3.9315e-06 deg node 236.2988748224847 6.1304e-05 deg peri 324.6220203459005 6.4176e-05 deg M 83.9679642567875 1.9344e-05 deg tp 2458510.300968930387 (2019-Jan-26.80096893) 0.0001123 TDB period 2101.654514874052 5.75 2.5107e-05 6.874e-08 d yr n .1712936153169657 2.0463e-09 deg/d Q 3.5538673742864 2.8304e-08 au   Orbit Determination Parameters    # obs. used (total)      612      data-arc span      9803 days (26.84 yr)      first obs. used      1993-12-17      last obs. used      2020-10-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51921      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 18:20:13   Additional Information  Earth MOID = 1.86628 au   Jupiter MOID = 1.42665 au   T_jup = 3.179  [ 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 14.8   n/a MPO436562   diameter diameter 6.040 km 1.405 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.048   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   117239 (2004 SM18)          Discovered 2004-Sep-17 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  2004 SM18 = 2002 JZ142  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-02 08:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin