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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1710190452469762 3.1072e-08  
a 2.259663622940684 6.3089e-09 au
q 1.873218107566045 7.1064e-08 au
i 4.312480763321774 4.0313e-06 deg
node 319.3523098247986 4.3614e-05 deg
peri 54.47577499164507 4.5056e-05 deg
M 148.6299471231911 1.1747e-05 deg
tp 2458884.266543835000
(2020-Feb-04.76654383)
3.9855e-05 TDB
period 1240.692389310735
3.40
5.196e-06
1.423e-08
d
yr
n .2901605612330688 1.2152e-09 deg/d
Q 2.646109138315323 7.3879e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1975  
   data-arc span      32755 days (89.68 yr)  
   first obs. used      1931-10-05  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49043  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:13:05  

Additional Information
 Earth MOID = .876599 au 
 Jupiter MOID = 2.83636 au 
 T_jup = 3.598 
[ 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 14.51   n/a MPO636393  

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

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