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

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1614546639702479 2.7427e-08  
a 2.57348638081392 1.2198e-08 au
q 2.157985001967599 6.6927e-08 au
i 6.773636981636656 4.0112e-06 deg
node 288.7567400882571 4.3135e-05 deg
peri 330.0274258810603 4.7635e-05 deg
M 129.6645582380873 1.9472e-05 deg
tp 2458853.374714300588
(2020-Jan-04.87471430)
8.247e-05 TDB
period 1507.930197030164
4.13
1.0721e-05
2.935e-08
d
yr
n .2387378412535357 1.6974e-09 deg/d
Q 2.988987759660241 1.4168e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1400  
   data-arc span      10783 days (29.52 yr)  
   first obs. used      1991-08-05  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4968  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:30:12  

Additional Information
 Earth MOID = 1.14569 au 
 Jupiter MOID = 2.10144 au 
 T_jup = 3.400 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.59   n/a E2021B10  
rotation period rot_per 64.5422 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

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

Alternate Designations
 1991 PU8 = 2000 WB54 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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