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

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2197161668382655 1.9003e-08  
a 3.117823680379595 1.7467e-08 au
q 2.432787412449017 6.0723e-08 au
i 15.8969689497982 8.7207e-07 deg
node 44.26373284678733 2.9301e-06 deg
peri 348.9575950560374 8.2565e-06 deg
M 321.1816648562661 5.9717e-06 deg
tp 2459417.325400999490
(2021-Jul-21.82540100)
3.4267e-05 TDB
period 2010.831841983738
5.51
1.6898e-05
4.626e-08
d
yr
n .1790303855765734 1.5045e-09 deg/d
Q 3.802859948310173 2.1305e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1686  
   data-arc span      23786 days (65.12 yr)  
   first obs. used      1955-10-25  
   last obs. used      2020-12-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48731  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:36:10  

Additional Information
 Earth MOID = 1.44063 au 
 Jupiter MOID = 1.63698 au 
 T_jup = 3.121 
[ 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 12.93   n/a E2021B10  
diameter diameter 14.792 km 0.200 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.067   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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