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91584 (1999 SQ20)
Classification: Main-belt Asteroid          SPK-ID: 2091584
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2547737606734561 5.4542e-08  
a 2.771938386162167 2.1138e-08 au
q 2.065721219164521 1.5271e-07 au
i 15.98420564520821 4.8788e-06 deg
node 61.61066782694368 2.0952e-05 deg
peri 247.2808006499044 2.2105e-05 deg
M 215.474021652491 9.2557e-06 deg
tp 2459677.232763560178
(2022-Apr-07.73276356)
4.6901e-05 TDB
period 1685.674767036532
4.62
1.9282e-05
5.279e-08
d
yr
n .2135643286829826 2.4429e-09 deg/d
Q 3.478155553159813 2.6524e-08 au
  Orbit Determination Parameters
   # obs. used (total)      688  
   data-arc span      7957 days (21.79 yr)  
   first obs. used      1998-04-23  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56627  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:33:56  

Additional Information
 Earth MOID = 1.10924 au 
 Jupiter MOID = 1.97301 au 
 T_jup = 3.234 
[ 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 14.6   n/a MPO502691  

91584 (1999 SQ20)          Discovered 1999-Sep-30 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 SQ20 = 1998 HU111 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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