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JPL Small-Body Database Browser
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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 | 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 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06737123881902941 3.52e-08  
a 2.431897276441332 6.1607e-09 au
q 2.268057344246856 8.6594e-08 au
i 4.960887109600526 3.8892e-06 deg
node 65.6561810571162 4.2602e-05 deg
peri 160.6156448473563 5.156e-05 deg
M 293.102234698837 3.0129e-05 deg
tp 2459257.909977221835
(2021-Feb-12.40997722)
0.00011616 TDB
period 1385.212067737781
3.79
5.2637e-06
1.441e-08
d
yr
n .2598880044323636 9.8755e-10 deg/d
Q 2.595737208635808 6.5757e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3589  
   data-arc span      53659 days (146.91 yr)  
   first obs. used      1873-05-30  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37643  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:59:15  

Additional Information
 Earth MOID = 1.25861 au 
 Jupiter MOID = 2.37873 au 
 T_jup = 3.499 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456268.5 (2012-Dec-07.0) TDB
Reference: JPL 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06759134529899291 3.5115e-08  
q 2.267062990663159 8.6397e-08 au
tp 2456489.561463019738
(2013-Jul-16.06146302)
0.00011411 TDB
node 65.69781527809131 4.2619e-05 deg
peri 161.1643197323839 5.1567e-05 deg
i 4.960642096964608 3.8883e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3589  
   data-arc span      53659 days (146.91 yr)  
   first obs. used      1873-05-30  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37643  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:59:15  

Additional Information
 Jupiter MOID = 2.37873 au 
 T_jup = 3.499 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.233052566828995E-15 -3.027345612913704E-15 -2.922566130343289E-14 6.06787844733818E-16 -2.852520590270207E-15 9.989211140044718E-16
q -3.027345612913704E-15 7.464430177736188E-15 1.563714464468026E-13 -2.148220996996463E-15 2.649664928447375E-14 -2.4301058250574E-15
tp -2.922566130343289E-14 1.563714464468026E-13 1.302088481803557E-8 -2.3617197146038E-11 3.325966160540975E-9 -2.410352584746798E-13
node 6.06787844733818E-16 -2.148220996996463E-15 -2.3617197146038E-11 1.816359058258839E-9 -1.815013710637642E-9 -3.556982730753719E-12
peri -2.852520590270207E-15 2.649664928447375E-14 3.325966160540975E-9 -1.815013710637642E-9 2.659140170846936E-9 3.462372463342255E-12
i 9.989211140044718E-16 -2.4301058250574E-15 -2.410352584746798E-13 -3.556982730753719E-12 3.462372463342255E-12 1.511886708675275E-11

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. 2019-August); 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.]
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.DBLast Updated: 2003-08-29

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