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3221 Changshi (1981 XF2)
Classification: Main-belt Asteroid          SPK-ID: 2003221
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1536280575285813 2.4929e-08  
a 2.204018650862031 5.7051e-09 au
q 1.865419546773333 5.3667e-08 au
i 3.651179848549437 3.2665e-06 deg
node 78.60842390088446 5.1604e-05 deg
peri 233.2028077718088 5.3298e-05 deg
M 18.55776645026341 1.3567e-05 deg
tp 2458938.890947624679
(2020-Mar-30.39094762)
4.5027e-05 TDB
period 1195.14699759576
3.27
4.6405e-06
1.27e-08
d
yr
n .3012181771147825 1.1696e-09 deg/d
Q 2.54261775495073 6.5816e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2881  
   data-arc span      24780 days (67.84 yr)  
   first obs. used      1953-01-12  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40936  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:10:56  

Additional Information
 Earth MOID = .853855 au 
 Jupiter MOID = 2.70283 au 
 T_jup = 3.644 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457146.5 (2015-May-04.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1533795611681009 2.4914e-08  
q 1.866709006830006 5.3619e-08 au
tp 2457743.524374333188
(2016-Dec-21.02437433)
4.5205e-05 TDB
node 78.66158225724713 5.1571e-05 deg
peri 233.1104568694544 5.3272e-05 deg
i 3.651827029643498 3.2667e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2881  
   data-arc span      24780 days (67.84 yr)  
   first obs. used      1953-01-12  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40936  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:10:56  

Additional Information
 Jupiter MOID = 2.70283 au 
 T_jup = 3.644 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.207033311756109E-16 -1.33096126598989E-15 1.372911926192543E-13 -3.057581139434137E-15 2.852294416604617E-14 9.226117530734652E-17
q -1.33096126598989E-15 2.875010385583995E-15 -3.111567499025782E-13 7.138815405434714E-15 -6.847592859794118E-14 -2.496054850847846E-16
tp 1.372911926192543E-13 -3.111567499025782E-13 2.043462154443837E-9 -9.20146974529299E-12 6.140606062927999E-10 -1.292231689394923E-12
node -3.057581139434137E-15 7.138815405434714E-15 -9.20146974529299E-12 2.65953621109052E-9 -2.656443278371796E-9 -5.940615290449914E-11
peri 2.852294416604617E-14 -6.847592859794118E-14 6.140606062927999E-10 -2.656443278371796E-9 2.837941209501126E-9 5.89143088237296E-11
i 9.226117530734652E-17 -2.496054850847846E-16 -1.292231689394923E-12 -5.940615290449914E-11 5.89143088237296E-11 1.067103982783443E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.0   n/a MPO384780  
diameter diameter 5.998 km 0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.373   0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

3221 Changshi (1981 XF2)          Discovered 1981-Dec-02 by Purple Mountain Observatory at Nanking
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 XF2 = 1954 KG = 1954 LJ = 1970 GU1 = 1973 DO = 1974 RS1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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