+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20704 (1999 WH) Classification: Main-belt Asteroid          SPK-ID: 2020704 [ 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 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0856940871865598 1.6025e-08   a 2.993080605123196 1.4728e-08 au q 2.736591294791368 5.0187e-08 au i 11.23984020695058 6.6618e-07 deg node 53.88077199275303 4.083e-06 deg peri 234.7893598788136 1.4121e-05 deg M 172.3304509857883 1.6649e-05 deg tp 2458295.110257715706 (2018-Jun-25.61025772) 8.5101e-05 TDB period 1891.368039472173 5.18 1.3961e-05 3.822e-08 d yr n .1903384177415125 1.4049e-09 deg/d Q 3.249569915455025 1.599e-08 au   Orbit Determination Parameters    # obs. used (total)      2920      data-arc span      24489 days (67.05 yr)      first obs. used      1954-02-26      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41209      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:27:32   Additional Information  Earth MOID = 1.73671 au   Jupiter MOID = 1.88262 au   T_jup = 3.221  [ 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 12.31   n/a E2021B10   diameter diameter 11.820 km 0.185 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.200   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20704 (1999 WH)          Discovered 1999-Nov-16 by Kobayashi, T. at Oizumi Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 WH = 1980 BE2 = 1983 YR  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 15:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin