+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1055934301090242 3.3791e-08   a 2.557513076882732 1.0888e-08 au q 2.287456498546 8.785e-08 au i 14.21940456990115 3.9767e-06 deg node 122.6009376250689 1.343e-05 deg peri 16.52720984489635 2.1889e-05 deg M 7.354462198136637 1.828e-05 deg tp 2459365.980765189486 (2021-May-31.48076519) 7.5787e-05 TDB period 1493.912707113896 4.09 9.5399e-06 2.612e-08 d yr n .2409779355150458 1.5389e-09 deg/d Q 2.827569655219464 1.2038e-08 au   Orbit Determination Parameters    # obs. used (total)      2079      data-arc span      12264 days (33.58 yr)      first obs. used      1987-11-15      last obs. used      2021-06-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4159      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 18:25:15   Additional Information  Earth MOID = 1.30526 au   Jupiter MOID = 2.22304 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 13.23   n/a MPCxxxxx   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-Aug-04 03:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin