+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1384 Kniertje (1934 RX) Classification: Main-belt Asteroid          SPK-ID: 2001384 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250209 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1818940 n/a   a 2.6761227 n/a AU q 2.1893520 n/a AU i 11.85210 n/a deg node 152.87788 n/a deg peri 276.53744 n/a deg M 287.53234 n/a deg tp 2456722.3838565 (2014-Mar-05.88385650) n/a JED period 1599.0331180 4.38 n/a n/a d yr n 0.22513605 n/a deg/d Q 3.1628934 n/a AU   Orbit Determination Parameters    # obs. used (total)      1097      first obs. used      1934-??-??      last obs. used      2012-09-28      # oppositions      28      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.325  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 9.70 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 diameter diameter 27.51 km 1.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 rotation period rot_per 9.807 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: [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hawkins, S.; Ditteon, R. (2008) Minor Planet Bul. 35, 1-4.] geometric albedo albedo 0.3077   0.039 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 1384 Kniertje (1934 RX)          Discovered 1934-Sep-09 by Van Gent, H. at Johannesburg (LS) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 06:39 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin