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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2419910840741745 3.9222e-08  
a 2.429896201025631 5.7516e-09 au
q 1.84188298515172 9.5391e-08 au
i 13.17579006092265 3.6255e-06 deg
node 48.59304333982003 1.6262e-05 deg
peri 306.1684185153067 1.7275e-05 deg
M 220.2696683651804 7.3411e-06 deg
tp 2459737.492473883769
(2022-Jun-06.99247388)
2.9058e-05 TDB
period 1383.502696489584
3.79
4.9121e-06
1.345e-08
d
yr
n .260209106143011 9.2387e-10 deg/d
Q 3.017909416899542 7.1434e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2787  
   data-arc span      32577 days (89.19 yr)  
   first obs. used      1931-11-10  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39628  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:53:43  

Additional Information
 Earth MOID = .870902 au 
 Jupiter MOID = 2.51753 au 
 T_jup = 3.433 
[ 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 11.96   n/a E2021B10 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. 2020-October); 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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