+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1689 Floris-Jan (1930 SO) Classification: Main-belt Asteroid          SPK-ID: 2001689 [ 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 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2058129897146526 6.1365e-08   a 2.449429322463638 9.1159e-09 AU q 1.945304950512661 1.4843e-07 AU i 6.380537542197674 4.612e-06 deg node 123.3229039756983 5.9667e-05 deg peri 264.5139560858393 6.0433e-05 deg M 168.4188655938836 1.2214e-05 deg tp 2455745.435547657143 (2011-Jul-02.93554766) 4.5936e-05 JED period 1400.218449470384 3.83 7.8167e-06 2.14e-08 d yr n .2571027400304329 1.4353e-09 deg/d Q 2.953553694414615 1.0992e-08 AU   Orbit Determination Parameters    # obs. used (total)      1448      data-arc span      31102 days (85.15 yr)      first obs. used      1928-02-25      last obs. used      2013-04-21      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .5092      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:46:37   Additional Information  Earth MOID = .961609 AU   T_jup = 3.459  [ 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 11.82 mag n/a PDS3 (MPC 17263)   rotation period rot_per 145. h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Schober, H.J.; Surdej, J.; Harris, A.W.; Young, J.W. (1982) Astron. Astrophys. 115, 257-262.] [Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.] B-V BV .685 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=6.66, mean=7.22, max.=7.78) deg. U-B UB .265 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=6.66, mean=7.22, max.=7.78) deg. 1689 Floris-Jan (1930 SO)          Discovered 1930-Sep-16 by Van Gent, H. at Johannesburg (LS) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1930 SO = 1926 PG = 1928 DN = 1934 VV = 1943 AC = 1949 OF = 1949 ON1 = 1949 OY = 1951 CW = 1966 BP  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 06:36 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin