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4645 Tentaikojo (1990 SP4)
Classification: Main-belt Asteroid          SPK-ID: 2004645
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1337006398915813 3.3889e-08  
a 2.674441813372823 1.2163e-08 au
q 2.316867231572076 8.8366e-08 au
i 9.457533161444328 4.2165e-06 deg
node 179.5525329121249 2.3585e-05 deg
peri 293.887295595842 2.8988e-05 deg
M 188.8703300307093 1.8587e-05 deg
tp 2459759.900658290685
(2022-Jun-29.40065829)
8.4425e-05 TDB
period 1597.526817142263
4.37
1.0898e-05
2.984e-08
d
yr
n .2253483297663737 1.5373e-09 deg/d
Q 3.03201639517357 1.3789e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2129  
   data-arc span      32625 days (89.32 yr)  
   first obs. used      1931-02-18  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43325  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:11:39  

Additional Information
 Earth MOID = 1.35171 au 
 Jupiter MOID = 2.10582 au 
 T_jup = 3.347 
[ 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 12.7   n/a MPO347560  
diameter diameter 17.238 km 0.095 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.055   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4645 Tentaikojo (1990 SP4)          Discovered 1990-Sep-16 by Fujii and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1990 SP4 = 1931 DU = 1962 JB = 1977 RT5 = 1979 FD1 = 1988 FF2 = 1990 SJ29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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