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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3335121342656844 4.5842e-08  
a 2.384258373591459 1.0877e-08 au
q 1.589079274774142 1.1173e-07 au
i 8.393447723031111 3.6275e-06 deg
node 108.1569670751558 3.6502e-05 deg
peri 157.742428830318 3.7542e-05 deg
M 323.7252536956323 1.1516e-05 deg
tp 2459335.997188758084
(2021-May-01.49718876)
4.354e-05 TDB
period 1344.709279111809
3.68
9.2017e-06
2.519e-08
d
yr
n .2677158591764778 1.8319e-09 deg/d
Q 3.179437472408775 1.4504e-08 au
  Orbit Determination Parameters
   # obs. used (total)      715  
   data-arc span      9367 days (25.65 yr)  
   first obs. used      1995-05-24  
   last obs. used      2021-01-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56028  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:10:13  

Additional Information
 Earth MOID = .575027 au 
 Jupiter MOID = 1.94142 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 15.92   n/a E2021B55  

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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