+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21387 Wafakhalil (1998 FW16) Classification: Main-belt Asteroid          SPK-ID: 2021387 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .121553419920269 3.9385e-08   a 2.36762936018311 8.1923e-09 au q 2.079835914349214 9.2042e-08 au i 3.481851218019187 4.0149e-06 deg node 331.6732408727376 4.9381e-05 deg peri 4.78405114496465 5.1045e-05 deg M 277.1191496908274 1.4717e-05 deg tp 2459506.851985542457 (2021-Oct-19.35198554) 5.5243e-05 TDB period 1330.665821886229 3.64 6.9064e-06 1.891e-08 d yr n .2705412539188069 1.4042e-09 deg/d Q 2.655422806017005 9.1881e-09 au   Orbit Determination Parameters    # obs. used (total)      1643      data-arc span      9632 days (26.37 yr)      first obs. used      1994-01-07      last obs. used      2020-05-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52064      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:57:19   Additional Information  Earth MOID = 1.06832 au   Jupiter MOID = 2.6795 au   T_jup = 3.534  [ 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 14.8   n/a MPO319352   diameter diameter 2.524 km 0.439 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.401   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21387 Wafakhalil           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Wafa Khalil (b. 1945), a 2004 Intel International Science and Engineering Fair Excellence in Teaching Award finalist, is a teacher at the MAST Academy High School, Miami, Florida, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20041226/MPCPages.arc Last Updated: 2004-12-25 Alternate Designations  1998 FW16 = 2000 WN117  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-10 20:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin