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4223 Shikoku (1988 JM)
Classification: Main-belt Asteroid          SPK-ID: 2004223
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1067836000087675 2.0839e-08  
a 3.006532541911546 1.3946e-08 au
q 2.68548417354272 6.5677e-08 au
i 9.24049371365631 7.972e-07 deg
node 269.1672482840422 4.8215e-06 deg
peri 82.92398999793704 8.4219e-06 deg
M 14.65246593138909 7.8457e-06 deg
tp 2459318.999320598863
(2021-Apr-14.49932060)
4.1374e-05 TDB
period 1904.13304593599
5.21
1.3249e-05
3.627e-08
d
yr
n .1890624191247306 1.3155e-09 deg/d
Q 3.327580910280371 1.5436e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2833  
   data-arc span      24739 days (67.73 yr)  
   first obs. used      1953-10-13  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42942  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:33:48  

Additional Information
 Earth MOID = 1.69897 au 
 Jupiter MOID = 2.10636 au 
 T_jup = 3.223 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457097.5 (2015-Mar-16.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1093309735629966 2.0918e-08  
q 2.677614333110365 6.6126e-08 au
tp 2457422.292835801204
(2016-Feb-03.79283580)
3.9564e-05 TDB
node 269.2401648364932 4.8183e-06 deg
peri 84.40605156008176 8.1305e-06 deg
i 9.248734158188759 7.9711e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2833  
   data-arc span      24739 days (67.73 yr)  
   first obs. used      1953-10-13  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42942  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:33:48  

Additional Information
 Jupiter MOID = 2.10636 au 
 T_jup = 3.223 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.375682018210818E-16 -1.359697059873457E-15 8.710692626628146E-14 -2.973881593586368E-14 8.277066176349408E-14 -4.815752688940106E-15
q -1.359697059873457E-15 4.372704414657529E-15 -3.103210699593551E-13 9.631238573178418E-14 -2.734651462744437E-13 1.569129355674358E-14
tp 8.710692626628146E-14 -3.103210699593551E-13 1.565340688902429E-9 9.590483617328437E-11 2.597556752794545E-10 1.525741404474643E-11
node -2.973881593586368E-14 9.631238573178418E-14 9.590483617328437E-11 2.321557442303311E-11 -2.658586956144379E-12 3.13776083656195E-12
peri 8.277066176349408E-14 -2.734651462744437E-13 2.597556752794545E-10 -2.658586956144379E-12 6.610438936092243E-11 4.450801393798422E-14
i -4.815752688940106E-15 1.569129355674358E-14 1.525741404474643E-11 3.13776083656195E-12 4.450801393798422E-14 6.353799657488479E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.96   n/a E2020-QM5  
diameter diameter 22.869 km 0.237 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.137 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Carbognani, A. (2011) Minor Planet Bull. 38, 57-63.]
[Durkee, R.I.; Ferrero, A. (2011) Minor Planet Bull. 38, 40-41.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.175   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4223 Shikoku (1988 JM)          Discovered 1988-May-07 by Seki, T. at Geisei
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 JM = 1948 VA = 1953 TG = 1958 TO = 1961 FA = 1969 XE = 1980 XF3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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