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118376 (1999 HE4)
Classification: Main-belt Asteroid          SPK-ID: 2118376
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08718149847749138 3.7081e-08  
a 2.617587874819417 1.2302e-08 au
q 2.389382641496149 9.5572e-08 au
i .7362138710537326 5.7592e-06 deg
node 178.7609292343878 0.00033465 deg
peri 295.3514286332834 0.00033647 deg
M 132.4544404628421 3.5495e-05 deg
tp 2458631.366232259549
(2019-May-27.86623226)
0.00015173 TDB
period 1546.857588697
4.24
1.0905e-05
2.986e-08
d
yr
n .2327298922864949 1.6406e-09 deg/d
Q 2.845793108142686 1.3374e-08 au
  Orbit Determination Parameters
   # obs. used (total)      444  
   data-arc span      7721 days (21.14 yr)  
   first obs. used      1999-04-06  
   last obs. used      2020-05-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56115  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 18:11:59  

Additional Information
 Earth MOID = 1.40584 au 
 Jupiter MOID = 2.22088 au 
 T_jup = 3.401 
[ 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 16.44   n/a E2021B55  

118376 (1999 HE4)          Discovered 1999-Apr-16 by Spacewatch at Kitt Peak
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

[ show close-approach data ]
Alternate Designations
 1999 HE4 = 2001 XD122 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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