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498 Tokio (A902 XA)
Classification: Main-belt Asteroid          SPK-ID: 2000498
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 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2229031454897766 2.2589e-08  
a 2.651965101995357 6.6011e-09 au
q 2.060833739031475 5.8304e-08 au
i 9.496432768681316 5.8666e-07 deg
node 97.20851086545645 2.8906e-06 deg
peri 241.8007587822967 3.3064e-06 deg
M 183.0888625642056 3.6681e-06 deg
tp 2459975.680444120499
(2023-Jan-31.18044412)
1.8347e-05 TDB
period 1577.430137685139
4.32
5.8897e-06
1.613e-08
d
yr
n .2282192988453333 8.521e-10 deg/d
Q 3.243096464959238 8.0725e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4548  
   data-arc span      42724 days (116.97 yr)  
   first obs. used      1904-03-14  
   last obs. used      2021-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37702  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 11:16:25  

Additional Information
 Earth MOID = 1.0693 au 
 Jupiter MOID = 2.19499 au 
 T_jup = 3.335 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.9   n/a MPO502157 IRAS observations used: 15
diameter diameter 81.83 km 2.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
rotation period rot_per 41.85 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F.; Martinez, L. (2013) Minor Planet Bull. 40, 196-197.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.0694   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
B-V BV 0.780   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.73, mean=10.06, max.=21.97) deg.
U-B UB 0.375   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.73, mean=10.06, max.=21.97) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

498 Tokio (A902 XA)          Discovered 1902-Dec-02 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A902 XA = A900 EB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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