+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   392 Wilhelmina (1894 BF) Classification: Main-belt Asteroid          SPK-ID: 2000392 [ 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 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1416386472484264 4.8345e-08   a 2.883317172973636 1.7499e-08 AU q 2.474928029005493 1.3756e-07 AU i 14.32236355401693 5.2726e-06 deg node 209.8467428696703 2.5418e-05 deg peri 174.5336936270085 3.4194e-05 deg M 79.84600428182949 2.5099e-05 deg tp 2456003.868007415895 (2012-Mar-17.36800742) 0.00012326 JED period 1788.286322084269 4.90 1.628e-05 4.457e-08 d yr n .2013100450158427 1.8326e-09 deg/d Q 3.291706316941779 1.9977e-08 AU   Orbit Determination Parameters    # obs. used (total)      1136      data-arc span      43225 days (118.34 yr)      first obs. used      1894-11-22      last obs. used      2013-03-28      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .5597      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:34:58   Additional Information  Earth MOID = 1.47884 AU   T_jup = 3.233  [ 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 9.70 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 diameter diameter 62.88 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 rotation period rot_per 17.96 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: [Gil-Hutton, R.; Canada, M. (2003) Revista Mexicana de Astronomica y Astrofisica 39, 69-76.] geometric albedo albedo 0.0589   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 392 Wilhelmina (1894 BF)          Discovered 1894-Nov-04 by Wolf, M. at Heidelberg (024) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1894 BF = 1931 HD = 1933 SW = 1933 UZ = 1952 ON  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 23:03 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin