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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06883756970035153 3.2151e-08  
a 2.225353243671016 6.6224e-09 au
q 2.072165334651909 7.1785e-08 au
i 4.139866610506707 3.3959e-06 deg
node 228.7981027240032 5.7237e-05 deg
peri 233.6372280990869 6.5074e-05 deg
M 281.6084566760449 3.1705e-05 deg
tp 2458864.536264089777
(2020-Jan-16.03626409)
0.00010708 TDB
period 1212.542208532754
3.32
5.4126e-06
1.482e-08
d
yr
n .2968968811697044 1.3253e-09 deg/d
Q 2.378541152690123 7.0783e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2664  
   data-arc span      31835 days (87.16 yr)  
   first obs. used      1932-09-30  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4181  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:36:04  

Additional Information
 Earth MOID = 1.09225 au 
 Jupiter MOID = 2.70761 au 
 T_jup = 3.640 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456509.5 (2013-Aug-05.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06853658035126707 3.2077e-08  
q 2.073053052307383 7.1615e-08 au
tp 2456438.248644630631
(2013-May-25.74864463)
0.0001056 TDB
node 228.8328920678131 5.7275e-05 deg
peri 233.3385552843302 6.5218e-05 deg
i 4.137741622325201 3.3955e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2664  
   data-arc span      31835 days (87.16 yr)  
   first obs. used      1932-09-30  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4181  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:36:04  

Additional Information
 Jupiter MOID = 2.70761 au 
 T_jup = 3.640 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.028924791789041E-15 -2.288520590467568E-15 1.038447423114576E-12 -6.893751635844012E-15 3.185972569259791E-13 1.044591144915125E-16
q -2.288520590467568E-15 5.128669762959232E-15 -2.199553877407623E-12 1.557625450369444E-14 -6.775963954831095E-13 -1.92391207290273E-16
tp 1.038447423114576E-12 -2.199553877407623E-12 1.115101670174435E-8 -1.408398494467003E-11 3.310838509949135E-9 -3.399907017277172E-13
node -6.893751635844012E-15 1.557625450369444E-14 -1.408398494467003E-11 3.280457535028805E-9 -3.275976479828634E-9 -4.109145233947187E-11
peri 3.185972569259791E-13 -6.775963954831095E-13 3.310838509949135E-9 -3.275976479828634E-9 4.25336696726743E-9 4.089685102801023E-11
i 1.044591144915125E-16 -1.92391207290273E-16 -3.399907017277172E-13 -4.109145233947187E-11 4.089685102801023E-11 1.152952916638975E-11

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-January); 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

[ hide close-approach data ]
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
1998-Sep-11 17:09 < 00:01 Iris 0.0373560070620486 0.0373547490007336 0.0373572651240467 3.78973634746696 3.78973630685971 2451068.214333468 0.213212362861425 63.3800140022977 32.9548410829751 9.90328442706416 91567.7376806715 T 37 CATAB v2.0f-lin.ifort 2019-Dec-03 20:36:19 2019-Dec-03 20:36
2103-Feb-27 00:05 < 00:01 Iris 0.031695921094333 0.0316897363316144 0.0317021067407929 4.31759684368217 4.3175968016746 2489221.503731108 0.206063203031202 406.585176308479 29.7116101346927 40.8174248028582 104636.43087026 T 37 CATAB v2.0f-lin.ifort 2019-Dec-03 20:36:19 2019-Dec-03 20:36
2161-Sep-02 02:48 00:05 Thisb 0.0242100231423534 0.024200909187963 0.0242191374867836 3.05364362219848 3.05364352997082 2510593.616870796 5.22534611920232 479.347042635905 27.2193550716088 18.707307206154 43227.3018080226 T 37 CATAB v2.0f-lin.ifort 2019-Dec-03 20:36:19 2019-Dec-03 20:36

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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