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131 Vala (A873 KA)
Classification: Main-belt Asteroid          SPK-ID: 2000131
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06726115766474684 7.881e-09  
a 2.431565422530582 5.3874e-09 au
q 2.268015517273606 2.105e-08 au
i 4.96090206175856 5.0393e-07 deg
node 65.65173058981405 5.1372e-06 deg
peri 160.8321431865494 1.7931e-05 deg
M 35.83748063480833 1.9362e-05 deg
tp 2459258.632361779769
7.4395e-05 TDB
period 1384.928540737772
n .2599412095357806 8.639e-10 deg/d
Q 2.595115327787558 5.7498e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3968  
   data-arc span      54127 days (148.19 yr)  
   first obs. used      1873-05-30  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36479  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:14:24  

Additional Information
 Earth MOID = 1.25895 au 
 Jupiter MOID = 2.3773 au 
 T_jup = 3.499 
[ 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 9.96   n/a MPO636062 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. 2020-October); 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.]
[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] (  
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.DBLast Updated: 2003-08-29

Alternate Designations
 A873 KA = 1945 KA = 1952 DS3 = 1953 QE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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