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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .160546147320498 7.8685e-08  
a 2.575311210134694 3.2256e-08 AU
q 2.161854917196279 1.9872e-07 AU
i 6.772287627511686 7.8253e-06 deg
node 288.7974084584609 7.2686e-05 deg
peri 330.0727541361514 7.6909e-05 deg
M 277.9418314145303 3.0106e-05 deg
tp 2457344.582292806454
(2015-Nov-18.08229281)
0.0001279 JED
period 1509.534365019417
4.13
2.8361e-05
7.765e-08
d
yr
n .238484136792321 4.4806e-09 deg/d
Q 2.988767503073109 3.7435e-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 = 1.15103 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 (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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