+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4769 Castalia (1989 PB) Classification: Apollo [NEO, PHA]          SPK-ID: 2004769 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 56 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4832419722093421 7.9927e-08   a 1.06341530552556 2.9879e-10 AU q .549528396005788 8.494e-08 AU i 8.88699567677765 1.3921e-05 deg node 325.6156742934625 1.2911e-05 deg peri 121.3307474748294 1.4794e-05 deg M 148.3286853102173 8.6047e-06 deg tp 2456235.465237075551 (2012-Nov-03.96523708) 9.5732e-06 JED period 400.5463577631328 1.10 1.6881e-07 4.622e-10 d yr n .8987723718433851 3.788e-10 deg/d Q 1.577302215045331 4.4318e-10 AU   Orbit Determination Parameters    # obs. used (total)      213      # delay obs. used      8      # Doppler obs. used      7      data-arc span      8445 days (23.12 yr)      first obs. used      1989-08-01      last obs. used      2012-09-14      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .4945      data source      ORB      producer      OSOD/JPL      solution date      2012-Sep-20 18:23:09   Additional Information  Earth MOID = .0203207 AU   T_jup = 5.675  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.9 mag n/a PDS3 (MPC 17949)   diameter diameter 1.4 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15) rotation period rot_per 4.095 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Ostro, S.J.; Chandler, J.F.; Hine, A.A.; Rosema, K.D.; et al. (1990) Science 248, 1523-1528.] [Hudson, R.S.; Ostro, S.J.; Harris, A.W. (1997) Icarus 130, 165-176.] 4769 Castalia (1989 PB)          Discovered 1989-Aug-09 by Helin, E. F. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-25 19:21 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin