+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103127 (1999 XR194) Classification: Main-belt Asteroid          SPK-ID: 2103127 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1587856701974014 5.9155e-08   a 2.428570123696022 1.3405e-08 au q 2.042947988983563 1.3918e-07 au i 6.174795288803813 4.452e-06 deg node 319.3440624011711 4.1915e-05 deg peri 47.13723396729046 4.4785e-05 deg M 263.4943629521515 2.1107e-05 deg tp 2459571.073688308266 (2021-Dec-22.57368831) 8.3409e-05 TDB period 1382.370314024574 3.78 1.1446e-05 3.134e-08 d yr n .2604222590341305 2.1562e-09 deg/d Q 2.814192258408482 1.5534e-08 au   Orbit Determination Parameters    # obs. used (total)      836      data-arc span      7467 days (20.44 yr)      first obs. used      1999-12-12      last obs. used      2020-05-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53135      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:50:33   Additional Information  Earth MOID = 1.04502 au   Jupiter MOID = 2.66446 au   T_jup = 3.484  [ 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 15.37   n/a E2021B55   diameter diameter 1.976 km 0.224 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.453   0.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   103127 (1999 XR194)          Discovered 1999-Dec-12 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 XR194 = 2002 KE3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-08 19:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin