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121210 (1999 QG2)
Classification: Mars-crossing Asteroid          SPK-ID: 2121210
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3335441246720834 4.5916e-08  
a 2.384683080678507 1.0919e-08 au
q 1.589286049913267 1.1195e-07 au
i 8.393522983957249 3.6302e-06 deg
node 108.1580391171257 3.65e-05 deg
peri 157.7141545788183 3.7546e-05 deg
M 270.2196097416802 1.1359e-05 deg
tp 2459335.946620255455
(2021-May-01.44662026)
4.3732e-05 TDB
period 1345.068593982562
3.68
9.238e-06
2.529e-08
d
yr
n .2676443429060296 1.8382e-09 deg/d
Q 3.180080111443746 1.4561e-08 au
  Orbit Determination Parameters
   # obs. used (total)      712  
   data-arc span      9038 days (24.74 yr)  
   first obs. used      1995-05-24  
   last obs. used      2020-02-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55858  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:51:44  

Additional Information
 Earth MOID = .577015 au 
 Jupiter MOID = 1.94155 au 
 T_jup = 3.445 
[ 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 15.8   n/a MPO417631  

121210 (1999 QG2)          Discovered 1999-Aug-25 by Sarounova, L. at Ondrejov
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1999 QG2 = 1995 KQ5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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