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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 ]

[ show orbit diagram ]
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
(2021-Feb-13.13236178)
7.4395e-05 TDB
period 1384.928540737772
3.79
4.6027e-06
1.26e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457101.5 (2015-Mar-20.0) TDB
Reference: JPL 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06808953870250233 7.8519e-09  
q 2.266006804609822 2.1004e-08 au
tp 2456488.848477356237
(2013-Jul-15.34847736)
7.2428e-05 TDB
node 65.68958075713631 5.139e-06 deg
peri 160.9237283928988 1.779e-05 deg
i 4.960273585671596 5.0378e-07 deg
  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
 Jupiter MOID = 2.3773 au 
 T_jup = 3.499 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.165205173153546E-17 -1.604015785877727E-16 1.092094839229988E-14 -3.76589003227687E-16 1.941555548996128E-15 -2.03483381112457E-16
q -1.604015785877727E-16 4.411801455759555E-16 3.69506415408653E-15 1.098738024952607E-15 4.932917319286497E-15 4.825418039963633E-16
tp 1.092094839229988E-14 3.69506415408653E-15 5.245832100824859E-9 3.125255416289486E-11 1.233339169353577E-9 -2.175107619995833E-12
node -3.76589003227687E-16 1.098738024952607E-15 3.125255416289486E-11 2.640979948302308E-11 -1.868205505410202E-11 -1.492502213721553E-12
peri 1.941555548996128E-15 4.932917319286497E-15 1.233339169353577E-9 -1.868205505410202E-11 3.164895604118318E-10 9.528522876973507E-13
i -2.03483381112457E-16 4.825418039963633E-16 -2.175107619995833E-12 -1.492502213721553E-12 9.528522876973507E-13 2.537922352175187E-13

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] (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.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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