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118221 (1996 HQ21)
Classification: Main-belt Asteroid          SPK-ID: 2118221
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1822174020268642 4.9374e-08  
a 2.464170676210515 1.429e-08 au
q 2.015155897440654 1.176e-07 au
i 11.3496771524148 5.0607e-06 deg
node 42.52067367840906 2.7365e-05 deg
peri 181.3136480009005 3.2733e-05 deg
M 132.0099532861306 1.7251e-05 deg
tp 2458682.405739470372
(2019-Jul-17.90573947)		 6.8538e-05 TDB
period 1412.877810708701
3.87		 1.229e-05
3.365e-08		 d
yr
n .2547991038371701 2.2164e-09 deg/d
Q 2.913185454980376 1.6893e-08 au
   Orbit Determination Parameters
   # obs. used (total)      932  
   data-arc span      9017 days (24.69 yr)  
   first obs. used      1996-04-18  
   last obs. used      2020-12-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53123  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 16:56:15  

Additional Information
 Earth MOID = 1.00527 au 
 Jupiter MOID = 2.06476 au 
 T_jup = 3.438 
[ 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 15.32   n/a E2021B55  

118221 (1996 HQ21)          Discovered 1996-Apr-18 by Elst, E. W. at La Silla
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

Alternate Designations
 1996 HQ21 = 2001 TM146 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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