+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74548 (1999 JM64) Classification: Main-belt Asteroid          SPK-ID: 2074548 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3288775227067173 5.243e-08   a 3.127130293460107 2.2426e-08 au q 2.098687429365817 1.7265e-07 au i 21.10570430012114 6.6217e-06 deg node 239.1998918739374 1.3342e-05 deg peri 259.4953562604177 1.7409e-05 deg M 354.9679032107115 9.248e-06 deg tp 2459028.733445245992 (2020-Jun-28.23344525) 5.1999e-05 TDB period 2019.841969294576 5.53 2.1728e-05 5.949e-08 d yr n .178231765391888 1.9173e-09 deg/d Q 4.155573157554397 2.9802e-08 au   Orbit Determination Parameters    # obs. used (total)      807      data-arc span      8121 days (22.23 yr)      first obs. used      1997-11-07      last obs. used      2020-02-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49002      source      ORB      producer      Otto Matic      solution date      2020-Feb-23 17:18:40   Additional Information  Earth MOID = 1.22494 au   Jupiter MOID = 1.7881 au   T_jup = 3.030  [ 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 13.7   n/a MPO280227   diameter diameter 9.538 km 0.228 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.070   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   74548 (1999 JM64)          Discovered 1999-May-10 by LINEAR at Socorro Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 JM64 = 2001 QO174  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-19 23:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin