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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1607524307163585 7.8961e-08  
a 2.576708466744589 3.1796e-08 AU
q 2.162496317467975 1.9967e-07 AU
i 6.774959195554842 7.8288e-06 deg
node 288.8089206148083 7.2619e-05 deg
peri 329.819766033659 7.6813e-05 deg
M 230.5652039513404 2.9789e-05 deg
tp 2457343.681408091064
(2015-Nov-17.18140809)
0.00012756 JED
period 1510.76304735915
4.14
2.7964e-05
7.656e-08
d
yr
n .2382901809978001 4.4107e-09 deg/d
Q 2.990920616021203 3.6907e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      531  
   data-arc span      8262 days (22.62 yr)  
   first obs. used      1991-08-05  
   last obs. used      2014-03-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52481  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:53:52  

Additional Information
 Earth MOID = 1.15 AU 
 T_jup = 3.399 
[ 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 (675)
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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