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101901 (1999 QD2)
Classification: Mars-crossing Asteroid          SPK-ID: 2101901
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06075857428595128 3.3671e-08  
a 1.685654948687118 5.0651e-09 au
q 1.58323695726683 5.6896e-08 au
i 23.28660741154334 4.4548e-06 deg
node 154.0247855062312 9.1706e-06 deg
peri 123.0076391388146 4.8663e-05 deg
M 316.1463783840899 5.2225e-05 deg
tp 2459297.876556125129
(2021-Mar-24.37655613)
0.00011627 TDB
period 799.3766287327178
2.19
3.603e-06
9.864e-09
d
yr
n .4503509197794808 2.0298e-09 deg/d
Q 1.788072940107406 5.3728e-09 au
  Orbit Determination Parameters
   # obs. used (total)      517  
   data-arc span      7550 days (20.67 yr)  
   first obs. used      1999-07-22  
   last obs. used      2020-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54153  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:17  

Additional Information
 Earth MOID = .605206 au 
 Jupiter MOID = 3.32207 au 
 T_jup = 4.131 
[ 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 17.25   n/a E2021B55  

101901 (1999 QD2)          Discovered 1999-Aug-22 by LONEOS at Anderson Mesa
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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