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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1343762265078774 2.1932e-08  
a 2.672209351753875 1.0743e-08 au
q 2.313127942626128 5.9392e-08 au
i 9.466904916988456 8.997e-07 deg
node 179.4970599074747 4.6085e-06 deg
peri 294.2401739083359 1.3826e-05 deg
M 233.6294461659254 1.3199e-05 deg
tp 2459760.576736725843
(2022-Jun-30.07673673)
6.0202e-05 TDB
period 1595.526957063447
4.37
9.6215e-06
2.634e-08
d
yr
n .2256307851185271 1.3606e-09 deg/d
Q 3.031290760881622 1.2186e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2501  
   data-arc span      32830 days (89.88 yr)  
   first obs. used      1931-02-18  
   last obs. used      2021-01-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4198  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:35:42  

Additional Information
 Earth MOID = 1.3478 au 
 Jupiter MOID = 2.10502 au 
 T_jup = 3.348 
[ 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 12.82   n/a E2021B10  
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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