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21072 (1991 PU8)
Classification: Main-belt Asteroid          SPK-ID: 2021072
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1606419927512318 6.7341e-08  
a 2.574909186200373 2.2359e-08 au
q 2.161270643375693 1.7931e-07 au
i 6.771162898016215 5.6336e-06 deg
node 288.7852470999168 6.8138e-05 deg
peri 330.2507382897011 7.2859e-05 deg
M 60.92684519199026 2.8132e-05 deg
tp 2457345.084357208516
(2015-Nov-18.58435721)
0.00011786 JED
period 1509.180905644895
4.13
1.9657e-05
5.382e-08
d
yr
n .2385399912319768 3.107e-09 deg/d
Q 2.988547729025054 2.595e-08 au
  Orbit Determination Parameters
   # obs. used (total)      625  
   data-arc span      8675 days (23.75 yr)  
   first obs. used      1991-08-05  
   last obs. used      2015-05-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51149  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:38:37  

Additional Information
 Earth MOID = 1.1487 au 
 Jupiter MOID = 2.09926 au 
 T_jup = 3.400 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5 mag n/a MPO240375  

21072 (1991 PU8)          Discovered 1991-Aug-05 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 PU8 = 2000 WB54 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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