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1236 Thais (1931 VX)
Classification: Main-belt Asteroid          SPK-ID: 2001236
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2417910244868944 3.9413e-08  
a 2.430291422014735 5.7671e-09 au
q 1.842668769284081 9.5848e-08 au
i 13.17451443176789 3.6282e-06 deg
node 48.59897653431338 1.6344e-05 deg
peri 306.1547711961547 1.7361e-05 deg
M 168.2417754620364 7.274e-06 deg
tp 2458353.778498806097
(2018-Aug-23.27849881)
2.7141e-05 TDB
period 1383.84024889431
3.79
4.9258e-06
1.349e-08
d
yr
n .2601456347924845 9.26e-10 deg/d
Q 3.017914074745389 7.1616e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2680  
   data-arc span      32362 days (88.60 yr)  
   first obs. used      1931-11-10  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39643  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:28:05  

Additional Information
 Earth MOID = .873159 au 
 Jupiter MOID = 2.51655 au 
 T_jup = 3.432 
[ 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 11.9   n/a MPO502165 IRAS observations used: 7
diameter diameter 22.34 km 1.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7
rotation period rot_per 47.9891 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.0599   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7
B-V BV 0.785   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=13.94, mean=16.65, max.=19.36) deg.
U-B UB 0.383   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.36 deg.
Tholen spectral type spec_T T   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1236 Thais (1931 VX)          Discovered 1931-Nov-06 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1931 VX = 1957 LQ = 1964 JH = 1965 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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