+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   2945 Zanstra (1935 ST1) Classification: Main-belt Asteroid          SPK-ID: 2002945 [ 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 .1390715254256434 6.1138e-08   a 2.669521435543943 1.8742e-08 AU q 2.298267017346393 1.6502e-07 AU i 2.626320798160653 5.9198e-06 deg node 95.89468780508436 0.00013974 deg peri 242.7287411187958 0.00014209 deg M 309.675559809 2.849e-05 deg tp 2456623.202451272635 (2013-Nov-26.70245127) 0.0001271 JED period 1593.120204693038 4.36 1.6778e-05 4.594e-08 d yr n .2259716491822189 2.3798e-09 deg/d Q 3.040775853741492 2.1349e-08 AU   Orbit Determination Parameters    # obs. used (total)      1274      data-arc span      28330 days (77.56 yr)      first obs. used      1935-09-28      last obs. used      2013-04-21      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .53406      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:55:00   Additional Information  Earth MOID = 1.2903 AU   T_jup = 3.366  [ 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 12.20 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 diameter diameter 21.12 km 1.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 rotation period rot_per 10.05 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0522   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 2945 Zanstra (1935 ST1)          Discovered 1935-Sep-28 by Van Gent, H. at Johannesburg (LS) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1935 ST1 = 1957 UC1 = 1970 SY = 1970 WM = 1975 XY5 = 1983 TN  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-20 04:58 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin