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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 | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .161520104871534 2.7427e-08  
a 2.573784177582955 1.2286e-08 au
q 2.158066287303061 6.6977e-08 au
i 6.773658451811424 4.0113e-06 deg
node 288.7582228372219 4.3132e-05 deg
peri 330.076810030141 4.7623e-05 deg
M 82.81040726252041 1.9522e-05 deg
tp 2458853.572252256050
(2020-Jan-05.07225226)
8.2407e-05 TDB
period 1508.191944907249
4.13
1.0799e-05
2.957e-08
d
yr
n .2386964081167661 1.7091e-09 deg/d
Q 2.989502067862849 1.427e-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-Apr-13 03:38:28  

Additional Information
 Earth MOID = 1.14402 au 
 Jupiter MOID = 2.10223 au 
 T_jup = 3.400 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457437.5 (2016-Feb-19.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1605526622663019 2.7456e-08  
q 2.161248474990134 6.6998e-08 au
tp 2457345.014618824802
(2015-Nov-18.51461882)
8.6566e-05 TDB
node 288.7874885034656 4.3141e-05 deg
peri 330.227999204248 4.7676e-05 deg
i 6.771633500339431 4.0085e-06 deg
  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-Apr-13 03:38:28  

Additional Information
 Jupiter MOID = 2.10223 au 
 T_jup = 3.400 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.538372659383831E-16 -1.821266033939734E-15 -2.415190133415517E-13 -2.621695108715606E-15 -6.072648700110664E-14 -5.714455147171977E-16
q -1.821266033939734E-15 4.488673158133216E-15 2.737064952334771E-13 1.233848976526911E-15 7.673762193248354E-14 1.243312233674839E-15
tp -2.415190133415517E-13 2.737064952334771E-13 7.493637016544589E-9 9.357911578841132E-11 1.797371444513506E-9 5.288820112746128E-12
node -2.621695108715606E-15 1.233848976526911E-15 9.357911578841132E-11 1.861166578084253E-9 -1.824805774602965E-9 9.686628497598821E-11
peri -6.072648700110664E-14 7.673762193248354E-14 1.797371444513506E-9 -1.824805774602965E-9 2.272960960178101E-9 -9.490514025179723E-11
i -5.714455147171977E-16 1.243312233674839E-15 5.288820112746128E-12 9.686628497598821E-11 -9.490514025179723E-11 1.606807633264133E-11

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 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

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