+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17948 (1999 JQ15) Classification: Main-belt Asteroid          SPK-ID: 2017948 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .207854168555069 4.4521e-08   a 2.402199849430275 7.5625e-09 au q 1.902892597023834 1.0533e-07 au i 5.036565938472944 4.6652e-06 deg node 157.3463107396614 3.8833e-05 deg peri 154.6713604700179 3.966e-05 deg M 185.8712820614241 9.0984e-06 deg tp 2459658.279041522740 (2022-Mar-19.77904152) 3.567e-05 TDB period 1359.916145662532 3.72 6.4219e-06 1.758e-08 d yr n .2647222044890225 1.2501e-09 deg/d Q 2.901507101836717 9.1345e-09 au   Orbit Determination Parameters    # obs. used (total)      2077      data-arc span      25575 days (70.02 yr)      first obs. used      1950-04-12      last obs. used      2020-04-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50414      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:43:09   Additional Information  Earth MOID = .89033 au   Jupiter MOID = 2.39004 au   T_jup = 3.490  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.0   n/a MPO502305   diameter diameter 3.149 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.590   0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17948 (1999 JQ15)          Discovered 1999-May-12 by Okuni, T. at Nanyo Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 JQ15 = 1977 RQ1 = 1991 EJ3 = 1992 SF20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-07 23:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin