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JPL Small-Body Database Browser
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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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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2417910247577366 3.9723e-08  
a 2.430291422093089 5.8532e-09 au
q 1.842668768685264 9.6697e-08 au
i 13.1745143394532 3.866e-06 deg
node 48.59897644467974 1.6375e-05 deg
peri 306.1547711850122 1.7545e-05 deg
M 168.241775463129 7.3883e-06 deg
tp 2458353.778498770621
(2018-Aug-23.27849877)
2.7668e-05 TDB
period 1383.840248961233
3.79
4.9993e-06
1.369e-08
d
yr
n .2601456347799037 9.3982e-10 deg/d
Q 3.017914075500914 7.2685e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2382  
   data-arc span      32229 days (88.24 yr)  
   first obs. used      1931-11-10  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41117  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:49:09  

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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2054-May-22 07:31 < 00:01 David 0.046823319247486 0.0468204734489565 0.0468261651208124 5.18270296163479 5.18270289938118 2471409.812939526 0.932426518450913 170.886878596612 29.1074899105405 34.471059899037 140256.141689339 T 33 CATAB v2.0f-lin.ifort 2020-Feb-22 15:49:25 2020-Feb-22 15:49
2065-Sep-20 14:47 00:01 David 0.0120079943566499 0.0120041925193499 0.0120117964678048 5.00636079949924 5.00636054820044 2475549.116072285 1.10718829899232 210.300793144857 25.706367927568 25.9159601147613 31469.342131741 T 33 CATAB v2.0f-lin.ifort 2020-Feb-22 15:49:25 2020-Feb-22 15:49

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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