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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2419910882105195 1.3958e-08  
a 2.429896201619166 5.4491e-09 au
q 1.841882975550736 3.39e-08 au
i 13.17578506080494 4.7065e-07 deg
node 48.59305753821268 3.0419e-06 deg
peri 306.1684017522568 4.1909e-06 deg
M 220.2696702437106 3.1664e-06 deg
tp 2459737.492466861210
(2022-Jun-06.99246686)
1.3494e-05 TDB
period 1383.502696996492
3.79
4.6538e-06
1.274e-08
d
yr
n .2602091060476717 8.7528e-10 deg/d
Q 3.017909427687595 6.7677e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2906  
   data-arc span      32640 days (89.36 yr)  
   first obs. used      1931-11-10  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39266  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:18:53  

Additional Information
 Earth MOID = .870902 au 
 Jupiter MOID = 2.51753 au 
 T_jup = 3.433 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456901.5 (2014-Sep-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2423394591290256 1.4158e-08  
q 1.841428254152179 3.4486e-08 au
tp 2456966.849265139586
(2014-Nov-05.34926514)
8.62e-06 TDB
node 48.71543277042629 3.0508e-06 deg
peri 305.5663045009369 4.1767e-06 deg
i 13.15872565994376 4.6983e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2906  
   data-arc span      32640 days (89.36 yr)  
   first obs. used      1931-11-10  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39266  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:18:53  

Additional Information
 Jupiter MOID = 2.51753 au 
 T_jup = 3.433 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.004564188232866E-16 -4.847726844842826E-16 -9.819444682706652E-14 5.306695067162634E-15 -3.946928403354885E-14 1.33611219968786E-15
q -4.847726844842826E-16 1.189286441327176E-15 2.435965018704268E-13 -1.278512195276109E-14 9.763401617294441E-14 -3.219468476803846E-15
tp -9.819444682706652E-14 2.435965018704268E-13 7.430467683955141E-11 1.765210067976084E-12 2.365754849284285E-11 1.692893519374365E-13
node 5.306695067162634E-15 -1.278512195276109E-14 1.765210067976084E-12 9.307087330639604E-12 -8.878129356342642E-12 2.159021361542154E-13
peri -3.946928403354885E-14 9.763401617294441E-14 2.365754849284285E-11 -8.878129356342642E-12 1.744457431012115E-11 -2.770883153316765E-13
i 1.33611219968786E-15 -3.219468476803846E-15 1.692893519374365E-13 2.159021361542154E-13 -2.770883153316765E-13 2.207416294660353E-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 11.95   n/a MPCxxxxx 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

Alternate Designations
 1931 VX = 1957 LQ = 1964 JH = 1965 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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