+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18063 (1999 XW211) Classification: Jupiter Trojan          SPK-ID: 2018063 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05750635095367711 5.6987e-08   a 5.153466723117698 1.0033e-07 au q 4.857109657109995 3.4688e-07 au i 17.98544992492952 6.1911e-06 deg node 327.0154535958877 1.4425e-05 deg peri 64.63503846859832 5.7096e-05 deg M 351.5570647774497 5.1629e-05 deg tp 2459300.716353750864 (2021-Mar-27.21635375) 0.00061166 TDB period 4273.145108818359 11.70 0.00012479 3.417e-07 d yr n .08424708050683301 2.4604e-09 deg/d Q 5.449823789125401 1.061e-07 au   Orbit Determination Parameters    # obs. used (total)      1391      data-arc span      16923 days (46.33 yr)      first obs. used      1974-10-11      last obs. used      2021-02-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47621      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:21:36   Additional Information  Earth MOID = 3.90124 au   Jupiter MOID = .00728717 au   T_jup = 2.900  [ 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 11.26   n/a E2021B10   diameter diameter 31.122 km 0.273 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.073   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   18063 (1999 XW211)          Discovered 1999-Dec-13 by LINEAR at Socorro Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 XW211 = 1974 TR1 = 1996 RM27  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-23 15:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin