+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   7815 Dolon (1987 QN) Classification: Jupiter Trojan          SPK-ID: 2007815 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05900001557789834 5.3518e-08   a 5.271507167049037 8.8666e-08 au q 4.960488162074141 2.897e-07 au i 20.36643233945965 5.2051e-06 deg node 147.5156168535583 1.3766e-05 deg peri 218.2967466687441 4.7919e-05 deg M 213.730333272184 5.0006e-05 deg tp 2460796.690520049500 (2025-May-01.19052005) 0.00064116 TDB period 4420.79756988228 12.10 0.00011154 3.054e-07 d yr n .08143326951964153 2.0545e-09 deg/d Q 5.582526172023933 9.3897e-08 au   Orbit Determination Parameters    # obs. used (total)      2288      data-arc span      12070 days (33.05 yr)      first obs. used      1987-08-21      last obs. used      2020-09-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44588      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:25:25   Additional Information  Earth MOID = 3.97603 au   Jupiter MOID = .0040743 au   T_jup = 2.871  [ 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 10.2   n/a MPO350865   diameter diameter 42.516 km 0.955 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.089   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   7815 Dolon (1987 QN)          Discovered 1987-Aug-21 by Elst, E. W. at La Silla Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1987 QN = 1993 BO7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Nov-25 09:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin