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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .226336098283733 9.507e-08  
a 3.110405756278821 4.3213e-08 AU
q 2.406408653323409 2.9018e-07 AU
i 15.97608209635568 9.7711e-06 deg
node 44.51458423212428 2.9236e-05 deg
peri 348.4877882168383 3.432e-05 deg
M 251.0265449224245 2.2542e-05 deg
tp 2457407.015937382849
(2016-Jan-19.51593738)
0.00013415 JED
period 2003.659857369766
5.49
4.1755e-05
1.143e-07
d
yr
n .1796712144907556 3.7443e-09 deg/d
Q 3.814402859234234 5.2994e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      658  
   data-arc span      21037 days (57.60 yr)  
   first obs. used      1955-10-25  
   last obs. used      2013-05-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50714  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:53:03  

Additional Information
 Earth MOID = 1.41419 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 12.7 mag n/a MPO263535  

21021 (1988 XL2)          Discovered 1988-Dec-07 by Oshima, Y. at Gekko (888)
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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