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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08734964066490207 3.7692e-08  
a 2.617343246003353 1.2551e-08 au
q 2.388719253968252 9.7601e-08 au
i .7362378221226276 5.7999e-06 deg
node 178.7678126211471 0.00034271 deg
peri 295.3167680822384 0.00034449 deg
M 85.91774908590705 3.5409e-05 deg
tp 2458631.378078217483
(2019-May-27.87807822)
0.00015162 TDB
period 1546.640749501465
4.23
1.1125e-05
3.046e-08
d
yr
n .2327625210418388 1.6743e-09 deg/d
Q 2.845967238038455 1.3648e-08 au
  Orbit Determination Parameters
   # obs. used (total)      430  
   data-arc span      7691 days (21.06 yr)  
   first obs. used      1999-04-06  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56405  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 20:20:02  

Additional Information
 Earth MOID = 1.40529 au 
 Jupiter MOID = 2.22154 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 16.4   n/a MPO351683  

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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