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JPL Small-Body Database Browser
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441439 (2008 HL21)
Classification: Main-belt Asteroid          SPK-ID: 2441439
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02246144043625255 8.5912e-08  
a 3.073872598258726 6.5106e-08 au
q 3.004828991984309 2.8111e-07 au
i 8.976500571928682 1.1382e-05 deg
node 185.4447934991535 4.4056e-05 deg
peri 23.60077722872056 0.00021456 deg
M 18.35292676456791 0.00020858 deg
tp 2458500.147070959963
(2019-Jan-16.64707096)
0.0011406 TDB
period 1968.462846163588
5.39
6.2539e-05
1.712e-07
d
yr
n .1828838175440384 5.8103e-09 deg/d
Q 3.142916204533143 6.6568e-08 au
  Orbit Determination Parameters
   # obs. used (total)      81  
   data-arc span      4060 days (11.12 yr)  
   first obs. used      2008-03-29  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .71205  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 10:13:01  

Additional Information
 Earth MOID = 2.00339 au 
 Jupiter MOID = 1.81528 au 
 T_jup = 3.211 
[ 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 16.5   n/a MPO440826  

441439 (2008 HL21)          Discovered 2008-Mar-29 by Spacewatch at Kitt Peak
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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