+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   14221 (1999 WL) Classification: Main-belt Asteroid          SPK-ID: 2014221 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0993540589388532 2.2005e-08   a 2.25205992163852 6.3516e-09 au q 2.028308627450218 5.1481e-08 au i 6.07628254949914 1.1031e-06 deg node 99.17433321413054 6.2573e-06 deg peri 15.5640237099265 1.1494e-05 deg M 50.9190350444391 1.1142e-05 deg tp 2459025.899290696920 (2020-Jun-25.39929070) 3.7921e-05 TDB period 1234.435320587901 3.38 5.2224e-06 1.43e-08 d yr n .2916313183817114 1.2338e-09 deg/d Q 2.475811215826823 6.9827e-09 au   Orbit Determination Parameters    # obs. used (total)      2102      data-arc span      15027 days (41.14 yr)      first obs. used      1980-01-23      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48095      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:21:17   Additional Information  Earth MOID = 1.04542 au   Jupiter MOID = 2.59687 au   T_jup = 3.612  [ 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 14.33   n/a E2021B10   diameter diameter 3.465 km 0.049 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.337   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   14221 (1999 WL)          Discovered 1999-Nov-16 by Kobayashi, T. at Oizumi Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 WL = 1980 BX = 1980 DW1 = 1992 UK4 = 1996 WN3 = 1998 MP35  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-14 10:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin