+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   134687 (1999 XL56) Classification: Main-belt Asteroid          SPK-ID: 2134687 [ 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 .1958732444078971 4.9631e-08   a 2.423926952008512 1.4875e-08 au q 1.94914451571086 1.1758e-07 au i 2.557271924903192 4.1915e-06 deg node 69.33949428668366 0.0001039 deg peri 295.1780111748376 0.00010439 deg M 251.8925079653494 1.5082e-05 deg tp 2459614.433913980515 (2022-Feb-03.93391398) 6.0627e-05 TDB period 1378.4077886593 3.77 1.2689e-05 3.474e-08 d yr n .2611708980186132 2.4041e-09 deg/d Q 2.898709388306164 1.7789e-08 au   Orbit Determination Parameters    # obs. used (total)      554      data-arc span      7475 days (20.47 yr)      first obs. used      1999-11-09      last obs. used      2020-04-27      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53872      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 18:09:29   Additional Information  Earth MOID = .947307 au   Jupiter MOID = 2.56135 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 16.10   n/a E2021B55   diameter diameter 3.617 km 0.185 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.065   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   134687 (1999 XL56)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20060907/Numbers.arc Last Updated: 2006-09-10 [ show close-approach data ] Alternate Designations  1999 XL56 = 2003 YF78  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 03:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin