+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22389 (1994 PC21) Classification: Main-belt Asteroid          SPK-ID: 2022389 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01999189295563579 4.3508e-08   a 2.727274780494587 1.5199e-08 au q 2.672751395022334 1.2045e-07 au i 5.3256639865411 4.3842e-06 deg node 168.0123711644673 4.7663e-05 deg peri 251.723747535817 0.00011633 deg M 228.4445785245447 0.00010747 deg tp 2459801.670998328286 (2022-Aug-10.17099833) 0.0004925 TDB period 1645.097989660284 4.50 1.3752e-05 3.765e-08 d yr n .2188319493809245 1.8293e-09 deg/d Q 2.78179816596684 1.5503e-08 au   Orbit Determination Parameters    # obs. used (total)      919      data-arc span      9504 days (26.02 yr)      first obs. used      1994-08-12      last obs. used      2020-08-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53766      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:05:20   Additional Information  Earth MOID = 1.68713 au   Jupiter MOID = 2.26026 au   T_jup = 3.349  [ 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 15.08   n/a E2021B10   diameter diameter 5.506 km 0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.070   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22389 (1994 PC21)          Discovered 1994-Aug-12 by Elst, E. W. at La Silla Reference: 20010309/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1994 PC21 = 1999 TX289  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-23 03:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin