+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103164 (1999 XX226) Classification: Main-belt Asteroid          SPK-ID: 2103164 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08688251699452039 4.1969e-08   a 2.26404575232519 9.2352e-09 au q 2.067339758772425 9.7729e-08 au i 5.686857326501547 3.915e-06 deg node 94.70002960250902 4.7362e-05 deg peri 55.43520063878268 5.4326e-05 deg M 18.4761783328927 2.8594e-05 deg tp 2459136.638977203373 (2020-Oct-14.13897720) 9.8665e-05 TDB period 1244.30322075086 3.41 7.6134e-06 2.084e-08 d yr n .2893185471164836 1.7702e-09 deg/d Q 2.460751745877955 1.0038e-08 au   Orbit Determination Parameters    # obs. used (total)      824      data-arc span      7686 days (21.04 yr)      first obs. used      1999-11-17      last obs. used      2020-12-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51438      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:30   Additional Information  Earth MOID = 1.0848 au   Jupiter MOID = 2.53762 au   T_jup = 3.606  [ 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 15.72   n/a E2021B55   diameter diameter 2.057 km 0.480 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.240   0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   103164 (1999 XX226)          Discovered 1999-Dec-15 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 XX226 = 2002 TB227  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 19:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin