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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02413288353865005 8.6416e-08  
a 3.075496566967163 6.7743e-08 au
q 3.001275966493026 2.8544e-07 au
i 8.974285541869929 1.1388e-05 deg
node 185.2446422677205 4.4048e-05 deg
peri 22.83483612640082 0.00019997 deg
M 92.26065232574794 0.00019365 deg
tp 2458495.623313488737
(2019-Jan-12.12331349)
0.0010595 TDB
period 1970.023000729754
5.39
6.509e-05
1.782e-07
d
yr
n .1827389831827575 6.0377e-09 deg/d
Q 3.149717167441299 6.9378e-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 = 1.99968 au 
 Jupiter MOID = 1.80721 au 
 T_jup = 3.210 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457524.5 (2016-May-16.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02127629179027801 8.701e-08  
q 3.007677532594284 2.8443e-07 au
tp 2458493.480187826909
(2019-Jan-09.98018783)
0.0011857 TDB
node 185.457019712266 4.4024e-05 deg
peri 22.2540926756658 0.00022272 deg
i 8.979995285944744 1.1387e-05 deg
  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
 Jupiter MOID = 1.80721 au 
 T_jup = 3.210 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.570736715028197E-15 -2.41233583510094E-14 -6.036553054116733E-11 4.453548893986695E-14 -1.107894906889468E-11 -2.306958437059115E-14
q -2.41233583510094E-14 8.089889295525925E-14 1.839382519873843E-10 -1.438251544857821E-13 3.340352781914705E-11 7.958927187597914E-14
tp -6.036553054116733E-11 1.839382519873843E-10 1.405791428172478E-6 -1.180452468394922E-10 2.58831398310177E-7 1.90776730473201E-10
node 4.453548893986695E-14 -1.438251544857821E-13 -1.180452468394922E-10 1.938073917440112E-9 -1.934863999409684E-9 -2.062770977362771E-10
peri -1.107894906889468E-11 3.340352781914705E-11 2.58831398310177E-7 -1.934863999409684E-9 4.960488965477113E-8 2.382606694181639E-10
i -2.306958437059115E-14 7.958927187597914E-14 1.90776730473201E-10 -2.062770977362771E-10 2.382606694181639E-10 1.296556096403495E-10

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

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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