+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74165 (1998 QU104) Classification: Main-belt Asteroid          SPK-ID: 2074165 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1938792157094338 4.8975e-08   a 2.632885934593405 1.6129e-08 au q 2.122424074542036 1.3173e-07 au i 5.49450069081516 4.9163e-06 deg node 64.97296717136437 6.126e-05 deg peri 259.1995016533881 6.2694e-05 deg M 51.68336436906078 1.3325e-05 deg tp 2458776.475885486538 (2019-Oct-19.97588549) 5.7297e-05 TDB period 1560.43791284464 4.27 1.4339e-05 3.926e-08 d yr n .2307044689421375 2.1199e-09 deg/d Q 3.143347794644774 1.9256e-08 au   Orbit Determination Parameters    # obs. used (total)      655      data-arc span      8100 days (22.18 yr)      first obs. used      1998-08-26      last obs. used      2020-10-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56837      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:44:47   Additional Information  Earth MOID = 1.1187 au   Jupiter MOID = 2.20776 au   T_jup = 3.366  [ 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 MPO347990   diameter diameter 2.660 km 0.578 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.131   0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   74165 (1998 QU104)          Discovered 1998-Aug-26 by Elst, E. W. at La Silla Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 QU104 = 2002 QE42  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-24 16:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin