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JPL Small-Body Database Browser
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131 Vala
Classification: Main-belt Asteroid          SPK-ID: 2000131
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 68 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06737123824396625 3.6754e-08  
a 2.431897276183496 6.2719e-09 au
q 2.268057345404885 9.0022e-08 au
i 4.960886794940222 4.0847e-06 deg
node 65.65618434603419 4.2991e-05 deg
peri 160.6156423194471 5.1858e-05 deg
M 293.1022341797975 3.0153e-05 deg
tp 2459257.909979178065
0.00011626 TDB
period 1385.212067517486
n .2598880044736945 1.0054e-09 deg/d
Q 2.595737206962107 6.6944e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3403  
   data-arc span      53575 days (146.68 yr)  
   first obs. used      1873-05-30  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38472  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:17:50  

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] (  
rotation period rot_per 5.1812 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2009) Observatoire de Geneve web site,]
[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.]
geometric albedo albedo 0.246   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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          Discovered 1873-May-24 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
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 68 CATAB v2.0f-lin.ifort 2020-Feb-22 15:18:05 2020-Feb-22 15:18

Alternate Designations
 1945 KA = 1952 DS3 = 1953 QE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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