+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1217316843874975 3.6044e-08   a 2.36849699593193 7.244e-09 au q 2.080175867150408 8.5493e-08 au i 3.481859012766085 3.8377e-06 deg node 331.6722605872181 4.7899e-05 deg peri 4.640929584640014 4.9432e-05 deg M 330.2768792437833 1.3205e-05 deg tp 2459506.425788459132 (2021-Oct-18.92578846) 4.9044e-05 TDB period 1331.397337778218 3.65 6.1081e-06 1.672e-08 d yr n .2703926091671127 1.2405e-09 deg/d Q 2.656818124713451 8.1258e-09 au   Orbit Determination Parameters    # obs. used (total)      1711      data-arc span      10026 days (27.45 yr)      first obs. used      1994-01-07      last obs. used      2021-06-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51371      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 05:07:13   Additional Information  Earth MOID = 1.06974 au   Jupiter MOID = 2.67693 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-Jul-31 07:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin