+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1029 La Plata (A924 HB) Classification: Main-belt Asteroid          SPK-ID: 2001029 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02792278699469455 4.304e-08   a 2.889892816375371 9.8251e-09 au q 2.809198954826223 1.2523e-07 au i 2.424742015477898 4.5133e-06 deg node 29.89243137064968 8.2147e-05 deg peri 141.1836102691543 0.00010166 deg M 249.6952763751404 6.0478e-05 deg tp 2459550.310006981973 (2021-Dec-01.81000698) 0.00030206 TDB period 1794.407311029263 4.91 9.151e-06 2.505e-08 d yr n .2006233466545038 1.0231e-09 deg/d Q 2.970586677924518 1.0099e-08 au   Orbit Determination Parameters    # obs. used (total)      3040      data-arc span      37996 days (104.03 yr)      first obs. used      1916-10-31      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44029      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:57:50   Additional Information  Earth MOID = 1.81394 au   Jupiter MOID = 1.98867 au   T_jup = 3.289  [ 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 10.9   n/a MPO502162 IRAS observations used: 2 diameter diameter 20.78 km 1.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 rotation period rot_per 15.310 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P. (1987) Icarus 72, 135-208.] [Slivan, S.M.; Binzel, R.P.; Boroumand, S.C.; Pan M.W.; et al. (2008) Icarus 195, 226-276.] [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.1819   0.039 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 B-V BV 0.787   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=3.17, mean=9.27, max.=12.32) deg. U-B UB 0.390   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=3.17, mean=9.27, max.=12.32) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1029 La Plata (A924 HB)          Discovered 1924-Apr-28 by Hartmann, J. at La Plata Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A924 HB = 1938 DR2 = 1969 OU = A916 UL = A916 UR  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 18:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin