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21975 (1999 XR2)
Classification: Main-belt Asteroid          SPK-ID: 2021975
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1709051464994136 3.3131e-08  
a 2.259764879852078 6.6198e-09 au
q 1.873559432006728 7.6262e-08 au
i 4.312521645049599 4.0404e-06 deg
node 319.3525970085187 4.7743e-05 deg
peri 54.47245166135365 4.9148e-05 deg
M 91.77525944726278 1.1762e-05 deg
tp 2458884.187445720602
(2020-Feb-04.68744572)
4.0215e-05 TDB
period 1240.775784524133
3.40
5.4521e-06
1.493e-08
d
yr
n .290141058916675 1.2749e-09 deg/d
Q 2.645970327697427 7.7511e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1768  
   data-arc span      32616 days (89.30 yr)  
   first obs. used      1931-10-05  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50822  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:23  

Additional Information
 Earth MOID = .876275 au 
 Jupiter MOID = 2.83573 au 
 T_jup = 3.598 
[ 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 14.5   n/a MPO502329  

21975 (1999 XR2)          Discovered 1999-Dec-04 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 XR2 = 1931 TT = 1975 RY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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