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234061 (1999 HE1)
Classification: Apollo [NEO]          SPK-ID: 2234061
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 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5728013478269836 3.0186e-08  
a 2.361523229719491 1.3325e-08 au
q 1.008839540811435 7.173e-08 au
i 8.166365374611978 7.0778e-06 deg
node 65.81895947865709 3.7824e-05 deg
peri 221.959510698882 3.7734e-05 deg
M 264.1056475165785 9.9393e-06 deg
tp 2459353.583391944649
(2021-May-19.08339194)
3.9404e-05 TDB
period 1325.521449472728
3.63
1.1219e-05
3.072e-08
d
yr
n .2715912293559659 2.2986e-09 deg/d
Q 3.714206918627546 2.0957e-08 au
  Orbit Determination Parameters
   # obs. used (total)      266  
   data-arc span      6580 days (18.02 yr)  
   first obs. used      1999-04-18  
   last obs. used      2017-04-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55322  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-04 09:02:04  

Additional Information
 Earth MOID = .0514768 au 
 Jupiter MOID = 1.54251 au 
 T_jup = 3.297 
[ 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 17.6   n/a MPO440207  
diameter diameter 2.900 km 0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
geometric albedo albedo 0.019   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  

234061 (1999 HE1)          Discovered 1999-Apr-18 by CSS at Catalina
Reference: 20100330/Numbers.arcLast Updated: 2010-04-05

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