+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1215694602893469 4.0342e-08   a 2.851095186928157 1.3625e-08 au q 2.504489083819746 1.1729e-07 au i 4.60567429846316 4.1829e-06 deg node 204.43529327 4.7806e-05 deg peri 152.4955268625459 5.0021e-05 deg M 192.4461277552444 1.6462e-05 deg tp 2460214.904428145616 (2023-Sep-27.40442815) 8.2932e-05 TDB period 1758.393227117099 4.81 1.2605e-05 3.451e-08 d yr n .2047323627322105 1.4676e-09 deg/d Q 3.197701290036568 1.5281e-08 au   Orbit Determination Parameters    # obs. used (total)      1458      data-arc span      10689 days (29.26 yr)      first obs. used      1992-03-02      last obs. used      2021-06-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49627      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 18:31:29   Additional Information  Earth MOID = 1.5008 au   Jupiter MOID = 2.26156 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 14.19   n/a MPCxxxxx   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-Aug-01 04:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin