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442216 (2011 HD18)
Classification: Main-belt Asteroid          SPK-ID: 2442216
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1494887834132098 7.2199e-08  
a 2.248150657796935 2.5946e-08 au
q 1.912077351033264 1.5656e-07 au
i 3.212195436154072 8.8534e-06 deg
node 172.6826762826146 0.00012855 deg
peri 81.13862193178743 0.00013245 deg
M 214.9757815919236 2.8463e-05 deg
tp 2459496.491892158290
(2021-Oct-08.99189216)
9.7745e-05 TDB
period 1231.222502951551
3.37
2.1314e-05
5.835e-08
d
yr
n .2923923166909224 5.0617e-09 deg/d
Q 2.584223964560607 2.9824e-08 au
  Orbit Determination Parameters
   # obs. used (total)      87  
   data-arc span      5711 days (15.64 yr)  
   first obs. used      2004-03-17  
   last obs. used      2019-11-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55681  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-05 02:10:41  

Additional Information
 Earth MOID = .900768 au 
 Jupiter MOID = 2.45518 au 
 T_jup = 3.612 
[ 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 18.1   n/a MPO456095  

442216 (2011 HD18)          Discovered 2011-Apr-22 by Spacewatch at Kitt Peak
Reference: Last Updated: 2015-09-02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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