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3644 Kojitaku (1931 TW)
Classification: Main-belt Asteroid          SPK-ID: 2003644
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09441608200110961 3.113e-08  
a 2.248036490974482 6.4413e-09 au
q 2.035785693301149 6.9256e-08 au
i 3.533958408372738 4.1132e-06 deg
node 355.2696543594398 5.2781e-05 deg
peri 81.97142907648411 5.7369e-05 deg
M 106.6675151709138 2.1516e-05 deg
tp 2458835.718219108560
(2019-Dec-18.21821911)
7.3548e-05 TDB
period 1231.128717215373
3.37
5.2913e-06
1.449e-08
d
yr
n .2924145907458529 1.2568e-09 deg/d
Q 2.460287288647816 7.0495e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2455  
   data-arc span      32678 days (89.47 yr)  
   first obs. used      1931-10-05  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4344  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:08:14  

Additional Information
 Earth MOID = 1.05415 au 
 Jupiter MOID = 2.71474 au 
 T_jup = 3.621 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456718.5 (2014-Mar-02.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09394322050514467 3.107e-08  
q 2.03681191202315 6.9076e-08 au
tp 2456371.908944454103
(2013-Mar-20.40894445)
7.4806e-05 TDB
node 355.3422196163324 5.2715e-05 deg
peri 81.64657060251125 5.7382e-05 deg
i 3.53680188269064 4.1149e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2455  
   data-arc span      32678 days (89.47 yr)  
   first obs. used      1931-10-05  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4344  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:08:14  

Additional Information
 Jupiter MOID = 2.71474 au 
 T_jup = 3.621 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.653500626340693E-16 -2.138806091759272E-15 -2.472303438508667E-13 -1.292305119207324E-16 -9.596082442304181E-14 -3.829628379496052E-16
q -2.138806091759272E-15 4.771441626980431E-15 5.004728532824757E-13 7.966991755024218E-16 1.991088227523769E-13 8.855222689991183E-16
tp -2.472303438508667E-13 5.004728532824757E-13 5.595926865132936E-9 -1.621753595074533E-11 1.702474366516248E-9 -4.33367805203796E-13
node -1.292305119207324E-16 7.966991755024218E-16 -1.621753595074533E-11 2.778824078982736E-9 -2.777917615813293E-9 5.583130433750363E-12
peri -9.596082442304181E-14 1.991088227523769E-13 1.702474366516248E-9 -2.777917615813293E-9 3.292703714896487E-9 -5.688741776305111E-12
i -3.829628379496052E-16 8.855222689991183E-16 -4.33367805203796E-13 5.583130433750363E-12 -5.688741776305111E-12 1.693219928054086E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.12   n/a E2021B10  
diameter diameter 5.764 km 0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.1457 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.371   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

3644 Kojitaku (1931 TW)          Discovered 1931-Oct-05 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1931 TW = 1973 AZ3 = 1977 FJ3 = 1978 PR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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