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85191 (1991 RP4)
Classification: Main-belt Asteroid          SPK-ID: 2085191
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2585912177555647 4.7027e-08  
a 2.758746525965895 1.6684e-08 au
q 2.045358902337441 1.2675e-07 au
i 8.24741624265145 5.3491e-06 deg
node 228.2344255748055 3.4159e-05 deg
peri 118.9201166797286 3.5652e-05 deg
M 102.8721285626528 1.3685e-05 deg
tp 2458522.242982616803
(2019-Feb-07.74298262)
6.0678e-05 TDB
period 1673.655718643867
4.58
1.5182e-05
4.157e-08
d
yr
n .2150980013330947 1.9512e-09 deg/d
Q 3.472134149594349 2.0998e-08 au
  Orbit Determination Parameters
   # obs. used (total)      680  
   data-arc span      10372 days (28.40 yr)  
   first obs. used      1991-09-07  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49143  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:28:17  

Additional Information
 Earth MOID = 1.0545 au 
 Jupiter MOID = 2.06282 au 
 T_jup = 3.278 
[ 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 15.0   n/a MPO453282  
diameter diameter 3.809 km 0.897 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
geometric albedo albedo 0.134   0.099 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

85191 (1991 RP4)          Discovered 1991-Sep-07 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1991 RP4 = 2000 OU38 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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