+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18037 (1999 NA38) Classification: Jupiter Trojan          SPK-ID: 2018037 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08295367478003975 6.2422e-08   a 5.239949337885046 1.0339e-07 au q 4.805276284646245 3.3792e-07 au i 15.36672521554104 5.009e-06 deg node 114.4872938272973 2.3764e-05 deg peri 254.4415845778081 4.5219e-05 deg M 230.4335102030687 4.2727e-05 deg tp 2460777.309585033474 (2025-Apr-11.80958503) 0.0005472 TDB period 4381.159445638508 11.99 0.00012966 3.55e-07 d yr n .08217002929632791 2.4319e-09 deg/d Q 5.674622391123846 1.1196e-07 au   Orbit Determination Parameters    # obs. used (total)      1038      data-arc span      24190 days (66.23 yr)      first obs. used      1954-12-22      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51109      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:20:43   Additional Information  Earth MOID = 3.84219 au   Jupiter MOID = .0580977 au   T_jup = 2.922  [ 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 11.59   n/a E2021B10   diameter diameter 24.424 km 0.984 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.082   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   18037 (1999 NA38)          Discovered 1999-Jul-14 by LINEAR at Socorro Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 NA38 = 1997 NA5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-18 01:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin