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85186 (1991 PR2)
Classification: Main-belt Asteroid          SPK-ID: 2085186
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09808902747463005 5.7366e-08  
a 2.589577956123725 1.4346e-08 au
q 2.335568772837809 1.5616e-07 au
i 13.46371753957236 5.2984e-06 deg
node 315.7167582152568 1.5478e-05 deg
peri 4.34078193003323 2.4944e-05 deg
M 322.778543439581 1.826e-05 deg
tp 2459157.873924216416
(2020-Nov-04.37392422)
7.7115e-05 TDB
period 1522.095531805591
4.17
1.2648e-05
3.463e-08
d
yr
n .2365160349514652 1.9654e-09 deg/d
Q 2.843587139409641 1.5753e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1463  
   data-arc span      10597 days (29.01 yr)  
   first obs. used      1991-08-02  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47711  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 07:55:18  

Additional Information
 Earth MOID = 1.32259 au 
 Jupiter MOID = 2.4509 au 
 T_jup = 3.375 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456962.5 (2014-Nov-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09672779810238694 5.7323e-08  
q 2.339016593247175 1.5561e-07 au
tp 2457638.884683520844
(2016-Sep-07.38468352)
8.0293e-05 TDB
node 315.7525118351135 1.5482e-05 deg
peri 4.739134266871233 2.5188e-05 deg
i 13.46135617793036 5.2974e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1463  
   data-arc span      10597 days (29.01 yr)  
   first obs. used      1991-08-02  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47711  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 07:55:18  

Additional Information
 Jupiter MOID = 2.4509 au 
 T_jup = 3.375 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.285871416044168E-15 -8.89840125264902E-15 2.77800903979112E-13 -1.566293497819935E-14 1.606493691143305E-13 -3.235096264766496E-15
q -8.89840125264902E-15 2.421564618636775E-14 -9.589328939071997E-13 4.208350256028057E-14 -4.94387764122859E-13 8.890546770253625E-15
tp 2.77800903979112E-13 -9.589328939071997E-13 6.446940989163916E-9 -1.886678547116233E-12 1.598358910805373E-9 3.306073641101807E-13
node -1.566293497819935E-14 4.208350256028057E-14 -1.886678547116233E-12 2.396864771479562E-10 -2.334696302320156E-10 -4.316055569013712E-13
peri 1.606493691143305E-13 -4.94387764122859E-13 1.598358910805373E-9 -2.334696302320156E-10 6.344168931608786E-10 3.883216580238147E-13
i -3.235096264766496E-15 8.890546770253625E-15 3.306073641101807E-13 -4.316055569013712E-13 3.883216580238147E-13 2.80629127159726E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9   n/a MPO474738  
diameter diameter 6.315 km 0.293 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.147   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85186 (1991 PR2)          Discovered 1991-Aug-02 by Elst, E. W. at La Silla
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

Alternate Designations
 1991 PR2 = 2000 SA319 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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