+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4769 Castalia (1989 PB) Classification: Apollo [NEO, PHA]          SPK-ID: 2004769 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 92 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4832130746159153 6.092e-09   a 1.063180454582218 8.6212e-11 au q .5494377582519978 6.4617e-09 au i 8.88550714893862 6.792e-07 deg node 325.5403582622335 3.4673e-06 deg peri 121.4100927182626 3.6939e-06 deg M 145.3860958667711 8.3421e-07 deg tp 2459038.792830100803 (2020-Jul-08.29283010) 9.3207e-07 TDB period 400.4136765393142 1.10 4.8704e-08 1.333e-10 d yr n .8990701893886328 1.0936e-10 deg/d Q 1.576923150912438 1.2787e-10 au   Orbit Determination Parameters    # obs. used (total)      332      # delay obs. used      8      # Doppler obs. used      7      data-arc span      9817 days (26.88 yr)      first obs. used      1989-08-01      last obs. used      2016-06-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47705      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 16:44:52   Additional Information  Earth MOID = .0200989 au   Jupiter MOID = 3.66542 au   T_jup = 5.676  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.9   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 LCDB (Rev. 2020-October); Warner et al., 2009 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.] geometric albedo albedo 0.092   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   4769 Castalia (1989 PB)          Discovered 1989-Aug-09 by Helin, E. F. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 06:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin