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305949 (2009 HT21)
Classification: Main-belt Asteroid          SPK-ID: 2305949
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1034439280621113 6.6308e-08  
a 3.191378570536036 3.4412e-08 au
q 2.861249835266542 2.1901e-07 au
i 6.977386622029122 7.905e-06 deg
node 30.43630520676426 4.5114e-05 deg
peri 193.9887656321231 5.3921e-05 deg
M 327.768926859795 2.9172e-05 deg
tp 2459186.939606891768
(2020-Dec-03.43960689)
0.00016925 TDB
period 2082.408432045448
5.70
3.3681e-05
9.221e-08
d
yr
n .1728767490853798 2.7961e-09 deg/d
Q 3.521507305805529 3.7972e-08 au
  Orbit Determination Parameters
   # obs. used (total)      291  
   data-arc span      10224 days (27.99 yr)  
   first obs. used      1992-04-24  
   last obs. used      2020-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53963  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 20:02:01  

Additional Information
 Earth MOID = 1.85308 au 
 Jupiter MOID = 1.45862 au 
 T_jup = 3.177 
[ 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 15.5   n/a MPO427633  

305949 (2009 HT21)          Discovered 2009-Apr-16 by CSS at Catalina
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

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