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58818 (1998 HE2)
Classification: Main-belt Asteroid          SPK-ID: 2058818
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05004024566958025 4.3027e-08  
a 3.069044069757249 2.1968e-08 au
q 2.915468350535828 1.2932e-07 au
i 10.44361423429948 5.1546e-06 deg
node 62.5095817006801 2.6899e-05 deg
peri 43.45324683141349 6.0877e-05 deg
M 146.2002916664852 5.5716e-05 deg
tp 2458202.966651042342
(2018-Mar-25.46665104)
0.00030124 TDB
period 1963.826490030008
5.38
2.1086e-05
5.773e-08
d
yr
n .183315584053711 1.9683e-09 deg/d
Q 3.222619788978671 2.3067e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1080  
   data-arc span      8131 days (22.26 yr)  
   first obs. used      1998-03-24  
   last obs. used      2020-06-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54237  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 22:49:27  

Additional Information
 Earth MOID = 1.94179 au 
 Jupiter MOID = 1.93429 au 
 T_jup = 3.204 
[ 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 13.9   n/a MPO341079  
diameter diameter 6.992 km 0.525 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.120   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

58818 (1998 HE2)          Discovered 1998-Apr-20 by Sarounova, L. at Ondrejov
Reference: 20030614/Numbers.arcLast Updated: 2004-04-19

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