+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   175895 (1999 XJ122) Classification: Main-belt Asteroid          SPK-ID: 2175895 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .166091394858584 5.7231e-08   a 2.409061315229088 1.3265e-08 au q 2.008936961082834 1.3503e-07 au i 9.59318417372671 6.2385e-06 deg node 287.6465103366842 2.7065e-05 deg peri 138.6149432520805 3.1069e-05 deg M 220.0988315525326 1.5548e-05 deg tp 2459731.248833664074 (2022-May-31.74883366) 6.1424e-05 TDB period 1365.746850004421 3.74 1.128e-05 3.088e-08 d yr n .2635920412328497 2.1771e-09 deg/d Q 2.809185669375342 1.5468e-08 au   Orbit Determination Parameters    # obs. used (total)      512      data-arc span      7497 days (20.53 yr)      first obs. used      1999-12-05      last obs. used      2020-06-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44944      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 09:54:43   Additional Information  Earth MOID = 1.0336 au   Jupiter MOID = 2.48609 au   T_jup = 3.483  [ 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 16.24   n/a E2021B55   diameter diameter 2.654 km 0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.091   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   175895 (1999 XJ122)          Discovered 1999-Dec-07 by CSS at Catalina Reference: 20080221/Numbers.arc Last Updated: 2008-02-22 [ show close-approach data ] Alternate Designations  1999 XJ122 = 2003 YU78  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 17:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin