+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1946 Walraven (1931 PH) Classification: Main-belt Asteroid          SPK-ID: 2001946 [ 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 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2359005546235146 6.4939e-08   a 2.292734051896287 9.8831e-09 AU q 1.751876817449735 1.4992e-07 AU i 8.164404135876318 7.4803e-06 deg node 17.28313162021373 5.0125e-05 deg peri 339.8567681412491 5.1921e-05 deg M 148.5226503334553 1.8415e-05 deg tp 2455877.358542082658 (2011-Nov-11.85854208) 6.3269e-05 JED period 1268.028306978177 3.47 8.199e-06 2.245e-08 d yr n .2839053339888852 1.8357e-09 deg/d Q 2.833591286342839 1.2215e-08 AU   Orbit Determination Parameters    # obs. used (total)      1078      data-arc span      29833 days (81.68 yr)      first obs. used      1931-08-07      last obs. used      2013-04-11      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .50531      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:48:34   Additional Information  Earth MOID = .750515 AU   T_jup = 3.547  [ 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 11.9 mag n/a PDS3 (MPC 17263)   rotation period rot_per 10.223 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: [van Gent, H. (1933) Bul. Astron. Inst. Netherlands 7, 65-66.] [Folberth, J.; Casimir, S.; Dou, Y.; Evans, D; et al. (2012) Minor Planet Bul. 39, 51-55.] 1946 Walraven (1931 PH)          Discovered 1931-Aug-08 by Van Gent, H. at Johannesburg (LS) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1931 PH = 1952 PB = 1959 RE1 = 1966 TC = 1972 JE1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-20 19:22 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin