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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5726379118216404 3.0209e-08  
a 2.361952382403011 1.3291e-08 au
q 1.009408902321602 7.181e-08 au
i 8.167583248647528 7.079e-06 deg
node 65.83040817141976 3.7804e-05 deg
peri 221.9256745993477 3.7716e-05 deg
M 155.5397888855904 9.0877e-06 deg
tp 2458027.645751854683
(2017-Oct-01.14575185)
2.9068e-05 TDB
period 1325.882790570121
3.63
1.1191e-05
3.064e-08
d
yr
n .2715172129545494 2.2918e-09 deg/d
Q 3.714495862484419 2.0902e-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 = .0515989 au 
 Jupiter MOID = 1.54007 au 
 T_jup = 3.296 
[ 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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