+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   694 Ekard (A909 VC) Classification: Main-belt Asteroid          SPK-ID: 2000694 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3224979799243295 3.1348e-08   a 2.671602004432988 6.748e-09 au q 1.81001575484156 8.251e-08 au i 15.8876286858625 3.6213e-06 deg node 229.9935779595105 1.3154e-05 deg peri 111.7896761808255 1.4093e-05 deg M 156.5245519361261 5.7737e-06 deg tp 2458307.016653434608 (2018-Jul-07.51665343) 2.4556e-05 TDB period 1594.98303413396 4.37 6.043e-06 1.654e-08 d yr n .2257077299856495 8.5515e-10 deg/d Q 3.533188254024416 8.9242e-09 au   Orbit Determination Parameters    # obs. used (total)      2895      data-arc span      40550 days (111.02 yr)      first obs. used      1909-11-09      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41264      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:55:27   Additional Information  Earth MOID = .870995 au   Jupiter MOID = 2.23694 au   T_jup = 3.252  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 9.2   n/a MPO502159 IRAS observations used: 24 diameter diameter 121.891 km 0.721 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 5.925 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Zeigler, K.W.; Tomlinson, D. (1984) Minor Planet Bull. 11, 21-22.] [Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.] [Michalowski, T. (1993) Icarus 106, 563-572.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.] [Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2003) Abstracts of Photometry and Polarimetry of Asteroids: Impact on Collaboration, Kharkiv, 9-10.] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Alton, K.B. (2019) Minor Planet Bull. 46, 114-117.] geometric albedo albedo 0.026   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.712   0.009 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=7.91, mean=12.19, max.=20.28) deg. U-B UB 0.347   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.12 deg. Tholen spectral type spec_T CP:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 694 Ekard (A909 VC)          Discovered 1909-Nov-07 by Metcalf, J. H. at Taunton Independent discovery Nov. 9 by J. Helffrich, Heidelberg, was announced first. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A909 VC = 1951 CD1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 13:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin