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441440 (2008 HU21)
Classification: Main-belt Asteroid          SPK-ID: 2441440
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1666293400906608 8.6372e-08  
a 3.144112815365113 4.8919e-08 au
q 2.620211371770234 2.9128e-07 au
i 11.63480270680392 1.5089e-05 deg
node 225.5495970424851 3.2335e-05 deg
peri 61.10127777695151 5.9682e-05 deg
M 18.037546512317 4.7698e-05 deg
tp 2458898.471718614075
(2020-Feb-18.97171861)
0.00026919 TDB
period 2036.318036593932
5.58
4.7525e-05
1.301e-07
d
yr
n .1767896730916148 4.126e-09 deg/d
Q 3.668014258959991 5.7071e-08 au
  Orbit Determination Parameters
   # obs. used (total)      106  
   data-arc span      5385 days (14.74 yr)  
   first obs. used      2004-10-04  
   last obs. used      2019-07-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59632  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-26 10:35:57  

Additional Information
 Earth MOID = 1.62841 au 
 Jupiter MOID = 1.5598 au 
 T_jup = 3.156 
[ 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 16.0   n/a MPO477081  

441440 (2008 HU21)          Discovered 2008-Apr-26 by Mt. Lemmon Survey at Mount Lemmon
Reference: Last Updated: 2015-09-02

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