+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   790 Pretoria (1912 NW) Classification: Outer Main-belt Asteroid          SPK-ID: 2000790 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1508677457055262 5.8675e-08   a 3.409347785433741 2.5864e-08 AU q 2.894987170719225 1.9947e-07 AU i 20.52826999186341 5.9851e-06 deg node 252.0509693530052 1.2646e-05 deg peri 38.96941099262347 1.8768e-05 deg M 259.0845892578844 1.5528e-05 deg tp 2457045.055586225594 (2015-Jan-22.55558623) 0.00010405 JED period 2299.351598877011 6.30 2.6165e-05 7.164e-08 d yr n .1565658771698168 1.7816e-09 deg/d Q 3.923708400148257 2.9766e-08 AU   Orbit Determination Parameters    # obs. used (total)      1215      data-arc span      32606 days (89.27 yr)      first obs. used      1924-01-05      last obs. used      2013-04-13      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .52165      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:38:40   Additional Information  Earth MOID = 1.9068 AU   T_jup = 3.025  [ 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 8.00 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24 diameter diameter 170.37 km 2.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24 rotation period rot_per 10.37 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Schober, H.J.; Stanzel, R. (1979) Astron. Astrophys. Suppl. Ser. 38, 265-268.] [Warner, B.D. (2005) Minor Planet Bul. 32, 54-58.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2010) Minor Planet Bul. 37, 24-27.] geometric albedo albedo 0.0384   0.001 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24 B-V BV .706 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=6.21, mean=9.23, max.=11.25) deg. U-B UB .309 mag .049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=6.21, mean=9.23, max.=11.25) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 790 Pretoria (1912 NW)          Discovered 1912-Jan-16 by Wood, H. E. at Johannesburg (UO) and K. Van der Spuy. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1912 NW = 1970 HN  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-26 08:27 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin