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2478 Tokai (1981 JC)
Classification: Main-belt Asteroid          SPK-ID: 2002478
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06799421258795385 3.7729e-08  
a 2.225312919784299 9.4985e-09 au
q 2.074004520041765 8.647e-08 au
i 4.137794376295887 4.8289e-06 deg
node 228.812300231144 6.674e-05 deg
peri 233.577655605976 8.0741e-05 deg
M 344.8091384004548 4.675e-05 deg
tp 2457651.664056183328
0.00015757 JED
period 1212.509251387658
n .2969049511069688 1.901e-09 deg/d
Q 2.376621319526833 1.0144e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1798  
   data-arc span      30444 days (83.35 yr)  
   first obs. used      1932-09-30  
   last obs. used      2016-02-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .44913  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 17:54:20  

Additional Information
 Earth MOID = 1.09235 au 
 Jupiter MOID = 2.71231 au 
 T_jup = 3.640 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO365275  
rotation period rot_per 25.885 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Higgins, D.; Pravec, P.; Kusnirak, P.; Warner, B.D.; et al. (2007) CBET 824.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2007)]
[Oey, J. (2011)]
[Oey, J. (2016) Minor Planet Bul. 43, 45-51.]
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2478 Tokai (1981 JC)          Discovered 1981-May-04 by Furuta, T. at Tokai
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 JC = 1931 HH = 1932 SE = 1934 ED = 1939 VH = 1951 JP = 1955 OE = 1955 QV = 1957 BD = 1972 RS = 1978 NU2 = 1979 XR = 1981 JT 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-02 23:15 UT
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