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4101 Ruikou (1988 CE)
Classification: Main-belt Asteroid          SPK-ID: 2004101
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1150679842268374 2.1222e-08  
a 2.6979080410108 1.1151e-08 au
q 2.387465201102311 6.0428e-08 au
i 8.746761017820461 5.5989e-07 deg
node 338.8866123675169 5.5533e-06 deg
peri 340.5448713691515 7.9837e-06 deg
M 321.9628295381467 5.8823e-06 deg
tp 2459371.519189050682
(2021-Jun-06.01918905)
2.6769e-05 TDB
period 1618.59852640694
4.43
1.0035e-05
2.747e-08
d
yr
n .2224146347143594 1.3789e-09 deg/d
Q 3.008350880919289 1.2434e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2509  
   data-arc span      24627 days (67.43 yr)  
   first obs. used      1953-04-15  
   last obs. used      2020-09-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42199  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:56:51  

Additional Information
 Earth MOID = 1.37493 au 
 Jupiter MOID = 2.30771 au 
 T_jup = 3.343 
[ 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 12.37   n/a E2020-QM5  
diameter diameter 8.157 km 0.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.125   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4101 Ruikou (1988 CE)          Discovered 1988-Feb-08 by Seki, T. at Geisei
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 CE = 1966 CO = 1975 EG2 = 1981 RD3 = 1984 FY1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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