+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1112 Polonia (1928 PE) Classification: Main-belt Asteroid          SPK-ID: 2001112 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1028891817402833 6.6554e-08   a 3.019674329501139 1.57e-08 AU q 2.708982508616628 2.0119e-07 AU i 8.997820852765203 7.5857e-06 deg node 302.9424287228366 4.8774e-05 deg peri 87.53727122920336 6.2958e-05 deg M 348.6217421210961 3.7617e-05 deg tp 2456461.077571532530 (2013-Jun-17.57757153) 0.00020031 JED period 1916.631349351302 5.25 1.4948e-05 4.093e-08 d yr n .187829547983677 1.4649e-09 deg/d Q 3.330366150385649 1.7315e-08 AU   Orbit Determination Parameters    # obs. used (total)      1144      data-arc span      30795 days (84.31 yr)      first obs. used      1928-08-15      last obs. used      2012-12-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .56447      data source      ORB      producer      Otto Matic      solution date      2013-Mar-29 14:19:10   Additional Information  Earth MOID = 1.73261 AU   T_jup = 3.220  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.05 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13 diameter diameter 35.76 km 1.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13 rotation period rot_per 82.5 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Warner, B.D. (2008) Minor Planet Bul. 35, 67-71.] geometric albedo albedo 0.1319   0.012 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13 B-V BV .797 mag .027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=1.50, mean=6.47, max.=9.27) deg. U-B UB .447 mag .034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=1.50, mean=6.47, max.=9.27) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 1112 Polonia (1928 PE)          Discovered 1928-Aug-15 by Shajn, P. at Simeis (094) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1928 PE = 1933 PA = A908 XA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 11:19 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin