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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1536280749615825 3.2505e-08  
a 2.204018647427036 7.1178e-09 au
q 1.86541950544339 7.3061e-08 au
i 3.651183464737756 3.8211e-06 deg
node 78.60845368931567 5.5187e-05 deg
peri 233.2027745139044 5.6907e-05 deg
M 18.55777302709966 1.6297e-05 deg
tp 2458938.890925934579
(2020-Mar-30.39092593)
5.3995e-05 TDB
period 1195.146994801779
3.27
5.7895e-06
1.585e-08
d
yr
n .3012181778189618 1.4592e-09 deg/d
Q 2.542617789410683 8.2113e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2526  
   data-arc span      24676 days (67.56 yr)  
   first obs. used      1953-01-12  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42799  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:00:59  

Additional Information
 Earth MOID = .853855 au 
 Jupiter MOID = 2.70283 au 
 T_jup = 3.644 
[ show covariance matrix ]

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

[ show close-approach data ]
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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