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

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0688300850527187 3.1371e-08  
a 2.2254941944138 6.176e-09 au
q 2.072313239727967 7.0269e-08 au
i 4.139510196278916 3.2162e-06 deg
node 228.7942972883982 5.4505e-05 deg
peri 233.4543520436719 6.1276e-05 deg
M 40.52548412091396 2.8016e-05 deg
tp 2458863.990198135779
(2020-Jan-15.49019814)
9.431e-05 TDB
period 1212.657411432577
3.32
5.0479e-06
1.382e-08
d
yr
n .2968686758568627 1.2358e-09 deg/d
Q 2.378675149099634 6.6011e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2862  
   data-arc span      31987 days (87.58 yr)  
   first obs. used      1932-09-30  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40558  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:40:32  

Additional Information
 Earth MOID = 1.09225 au 
 Jupiter MOID = 2.70636 au 
 T_jup = 3.640 
[ 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 12.1   n/a MPO416734  
diameter diameter 9.238 km 0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 25.885 h n/a LCDB (Rev. 2019-August); 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) http://www.asu.cas.cz/~ppravec/neo.htm]
[Oey, J. (2011) http://minorplanet.haoeydental.com.au]
[Oey, J. (2016) Minor Planet Bull. 43, 45-51.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.252   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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