+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20680 (1999 VX9) Classification: Main-belt Asteroid          SPK-ID: 2020680 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1055710082974924 3.3813e-08   a 2.557359877713472 1.0993e-08 au q 2.287376816843709 8.7866e-08 au i 14.21957376160516 3.9782e-06 deg node 122.6011172685733 1.3552e-05 deg peri 16.58741397283794 2.2132e-05 deg M 320.0707578335301 1.8527e-05 deg tp 2459366.181784913614 (2021-May-31.68178491) 7.7278e-05 TDB period 1493.778477443471 4.09 9.6312e-06 2.637e-08 d yr n .2409995895884927 1.5539e-09 deg/d Q 2.827342938583235 1.2153e-08 au   Orbit Determination Parameters    # obs. used (total)      1979      data-arc span      12173 days (33.33 yr)      first obs. used      1987-11-15      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42289      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:26:26   Additional Information  Earth MOID = 1.30449 au   Jupiter MOID = 2.22348 au   T_jup = 3.386  [ 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 13.2   n/a MPO502322   diameter diameter 5.795 km 0.270 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.332   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20680 (1999 VX9)          Discovered 1999-Nov-09 by Juels, C. W. at Fountain Hills Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 VX9 = 1994 ND2 = 1998 MX29  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-14 12:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin