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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1821567282132061 5.0344e-08  
a 2.464938247211437 1.5176e-08 au
q 2.015933160851807 1.2101e-07 au
i 11.34853017230302 5.2081e-06 deg
node 42.53007797069185 2.8207e-05 deg
peri 181.405455999941 3.3664e-05 deg
M 80.94915597374643 1.7509e-05 deg
tp 2458682.653585717621
(2019-Jul-18.15358572)
6.9374e-05 TDB
period 1413.538013648555
3.87
1.3054e-05
3.574e-08
d
yr
n .2546800981112531 2.352e-09 deg/d
Q 2.913943333571067 1.794e-08 au
  Orbit Determination Parameters
   # obs. used (total)      851  
   data-arc span      8922 days (24.43 yr)  
   first obs. used      1996-04-18  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54087  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 20:11:50  

Additional Information
 Earth MOID = 1.00718 au 
 Jupiter MOID = 2.0653 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 15.3   n/a MPO475038  

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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