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21021 (1988 XL2)
Classification: Main-belt Asteroid          SPK-ID: 2021021
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2258578302994888 8.1974e-08  
a 3.109436728729673 2.6847e-08 au
q 2.407146095725249 2.6165e-07 au
i 15.97633291453355 8.923e-06 deg
node 44.49737050243654 2.5786e-05 deg
peri 348.460509031908 3.0644e-05 deg
M 34.78756232890088 1.4919e-05 deg
tp 2457406.972578698877
(2016-Jan-19.47257870)
8.236e-05 JED
period 2002.723588669612
5.48
2.5937e-05
7.101e-08
d
yr
n .1797552103728624 2.328e-09 deg/d
Q 3.811727361734097 3.291e-08 au
  Orbit Determination Parameters
   # obs. used (total)      849  
   data-arc span      22023 days (60.30 yr)  
   first obs. used      1955-10-25  
   last obs. used      2016-02-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49947  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 16:39:38  

Additional Information
 Earth MOID = 1.41473 au 
 Jupiter MOID = 1.62588 au 
 T_jup = 3.121 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a MPO358830  

21021 (1988 XL2)          Discovered 1988-Dec-07 by Oshima, Y. at Gekko
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1988 XL2 = 1999 TX27 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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