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91331 (1999 HX4)
Classification: Main-belt Asteroid          SPK-ID: 2091331
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1283167210380488 3.6786e-08  
a 2.295051058497948 8.4227e-09 au
q 2.000557632056589 8.4411e-08 au
i 6.531959217147635 6.3955e-06 deg
node 20.02304003043336 3.0226e-05 deg
peri 117.9417343010529 3.8436e-05 deg
M 70.70621523593717 2.3747e-05 deg
tp 2458751.073814659901
(2019-Sep-24.57381466)
8.341e-05 TDB
period 1269.95097139349
3.48
6.991e-06
1.914e-08
d
yr
n .2834755105584743 1.5605e-09 deg/d
Q 2.589544484939308 9.5035e-09 au
  Orbit Determination Parameters
   # obs. used (total)      674  
   data-arc span      7709 days (21.11 yr)  
   first obs. used      1999-03-21  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53953  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:39:43  

Additional Information
 Earth MOID = 1.02303 au 
 Jupiter MOID = 2.43526 au 
 T_jup = 3.576 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.1   n/a MPO453353  

91331 (1999 HX4)          Discovered 1999-Apr-17 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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