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21988 (1999 XQ20)
Classification: Main-belt Asteroid          SPK-ID: 2021988
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06305608421942258 4.8068e-08  
a 2.969350989185898 1.7513e-08 au
q 2.782115343134766 1.4508e-07 au
i 10.88518238218821 5.1587e-06 deg
node 54.55650257121965 2.733e-05 deg
peri 355.0389638987699 5.1129e-05 deg
M 74.54302392553041 4.2092e-05 deg
tp 2459009.514015425164
(2020-Jun-09.01401542)
0.00021847 TDB
period 1868.92008279834
5.12
1.6534e-05
4.527e-08
d
yr
n .1926246088923025 1.7041e-09 deg/d
Q 3.156586635237029 1.8617e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1139  
   data-arc span      12815 days (35.09 yr)  
   first obs. used      1986-03-04  
   last obs. used      2021-04-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52973  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:38:36  

Additional Information
 Earth MOID = 1.79231 au 
 Jupiter MOID = 2.17172 au 
 T_jup = 3.233 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO400221  

21988 (1999 XQ20)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XQ20 = 1997 JC12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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