+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   131 Vala (A873 KA) Classification: Main-belt Asteroid          SPK-ID: 2000131 [ 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 71 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0673712361440616 3.4709e-08   a 2.43189727606737 6.1214e-09 au q 2.268057350403335 8.5518e-08 au i 4.960887480773317 3.8146e-06 deg node 65.65618041368778 4.2579e-05 deg peri 160.6156446444489 5.1525e-05 deg M 293.1022358864957 3.0064e-05 deg tp 2459257.909972592575 (2021-Feb-12.40997259) 0.0001159 TDB period 1385.212067418267 3.79 5.2302e-06 1.432e-08 d yr n .2598880044923095 9.8126e-10 deg/d Q 2.595737201731405 6.5338e-09 au   Orbit Determination Parameters    # obs. used (total)      3694      data-arc span      53712 days (147.06 yr)      first obs. used      1873-05-30      last obs. used      2020-06-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37253      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:33:05   Additional Information  Earth MOID = 1.25861 au   Jupiter MOID = 2.37873 au   T_jup = 3.499  [ 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 9.9   n/a MPO502154 IRAS observations used: 10 diameter diameter 31.337 km 0.304 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.1812 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pilcher, F. (2009) Minor Planet Bull. 36, 100-102.] [Galad, A.; Kornos, L.; Vilagi, J. (2010) Minor Planet Bull. 37, 9-15.] [Pilcher, F. (2017) Minor Planet Bull. 44, 317-318.] [Fauerbach, M.; Fauerbach, M. (2019) Minor Planet Bull. 46, 236-237.] [Franco, L.; Marchini, A.; Baj, G.; Scarfi, G.; et al. (2019) Minor Planet Bull. 46, 85-86.] [Franco, L.; Pilcher, F.; Marchini, A.; Baj, G.; et al. (2019) Minor Planet Bull. 46, 392-394.] geometric albedo albedo 0.246   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.829   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=12.78 deg. U-B UB 0.402   0.053 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=12.78 deg. Tholen spectral type spec_T SU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Xc   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) 131 Vala (A873 KA)          Discovered 1873-May-24 by Peters, C. H. F. at Clinton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2028-Apr-05 19:36 < 00:01 Pallas 0.0276401830814556 0.0276386840310659 0.0276416821719563 13.5604895431753 13.5604892881435 2461867.316863463 0.165782331614037 92.7209242779469 21.8414325529874 37.5240003712413 120565.952102118 T 71 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:15 2020-Nov-13 04:33 Alternate Designations  A873 KA = 1945 KA = 1952 DS3 = 1953 QE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 23:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin