+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1946 Walraven (1931 PH) Classification: Main-belt Asteroid          SPK-ID: 2001946 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2349476383621562 4.0989e-08   a 2.29353302835508 6.3074e-09 au q 1.75467285983745 9.4688e-08 au i 8.15912029463548 4.4062e-06 deg node 17.24235147172354 2.6848e-05 deg peri 340.1438064836869 2.7825e-05 deg M 165.8880917177277 8.3975e-06 deg tp 2458415.886775404475 (2018-Oct-24.38677540) 2.9039e-05 TDB period 1268.691192207487 3.47 5.2335e-06 1.433e-08 d yr n .2837569947763333 1.1705e-09 deg/d Q 2.832393196872709 7.7894e-09 au   Orbit Determination Parameters    # obs. used (total)      2638      data-arc span      32473 days (88.91 yr)      first obs. used      1931-08-07      last obs. used      2020-07-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40882      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:13:59   Additional Information  Earth MOID = .753807 au   Jupiter MOID = 2.62023 au   T_jup = 3.546  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.0   n/a MPO416727   diameter diameter 9.205 km 0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 10.21 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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 Bull. 39, 51-55.] [Aznar, A.M.; Carreno Garcerain, A.; Arce Masego, E.; Brines Rodriques, P.; et al. (2016) Minor Planet Bull. 43, 257-263.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.362   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 06:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin