+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21209 (1994 PO30) Classification: Main-belt Asteroid          SPK-ID: 2021209 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1213687377468354 4.0354e-08   a 2.851583759821612 1.5065e-08 au q 2.505490638312688 1.1755e-07 au i 4.60491879439412 4.3642e-06 deg node 204.4417185041826 5.3672e-05 deg peri 152.462160856413 5.6386e-05 deg M 152.3608760337904 1.7546e-05 deg tp 2458456.113332174054 (2018-Dec-03.61333217) 8.489e-05 TDB period 1758.8452324067 4.82 1.3938e-05 3.816e-08 d yr n .2046797486026654 1.622e-09 deg/d Q 3.197676881330537 1.6893e-08 au   Orbit Determination Parameters    # obs. used (total)      1319      data-arc span      10549 days (28.88 yr)      first obs. used      1992-03-02      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50206      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:51:22   Additional Information  Earth MOID = 1.50095 au   Jupiter MOID = 2.2613 au   T_jup = 3.290  [ 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 14.18   n/a E2021B10   diameter diameter 6.519 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.114   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21209 (1994 PO30)          Discovered 1994-Aug-12 by Elst, E. W. at La Silla Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1994 PO30 = 1998 KF45  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-10 18:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin