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21071 (1991 PE7)
Classification: Main-belt Asteroid          SPK-ID: 2021071
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05905252180860167 1.7502e-08  
a 2.55422288943725 1.1238e-08 au
q 2.403389586554728 4.0864e-08 au
i 14.61446767046802 3.9175e-07 deg
node 330.2794694297732 3.185e-06 deg
peri 296.3156141405285 1.8383e-05 deg
M 117.1104338356491 1.6912e-05 deg
tp 2458715.457599442428
(2019-Aug-19.95759944)
6.984e-05 TDB
period 1491.03080299214
4.08
9.8399e-06
2.694e-08
d
yr
n .2414437040989137 1.5934e-09 deg/d
Q 2.705056192319773 1.1901e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2064  
   data-arc span      10805 days (29.58 yr)  
   first obs. used      1991-08-06  
   last obs. used      2021-03-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4728  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:53:02  

Additional Information
 Earth MOID = 1.41967 au 
 Jupiter MOID = 2.46153 au 
 T_jup = 3.391 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457358.5 (2015-Dec-02.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0585698507290886 1.7332e-08  
q 2.405444298876636 4.0408e-08 au
tp 2457228.085631336812
(2015-Jul-24.58563134)
7.1638e-05 TDB
node 330.3515059278907 3.187e-06 deg
peri 297.3804093441364 1.8715e-05 deg
i 14.60851418107645 3.9091e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2064  
   data-arc span      10805 days (29.58 yr)  
   first obs. used      1991-08-06  
   last obs. used      2021-03-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4728  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:53:02  

Additional Information
 Jupiter MOID = 2.46153 au 
 T_jup = 3.391 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.004136855144804E-16 -6.811774332567468E-16 -5.263414162638841E-13 4.49877985120604E-15 -1.391986349723828E-13 -2.653970297922941E-15
q -6.811774332567468E-16 1.632771228639819E-15 1.256738072399435E-12 -1.099736451354014E-14 3.329313444426077E-13 6.338620180637844E-15
tp -5.263414162638841E-13 1.256738072399435E-12 5.131948163224265E-9 4.185781438842692E-11 1.321795108259505E-9 1.808298787108933E-12
node 4.49877985120604E-15 -1.099736451354014E-14 4.185781438842692E-11 1.015691582335998E-11 1.193379071100862E-12 -1.085401215624902E-12
peri -1.391986349723828E-13 3.329313444426077E-13 1.321795108259505E-9 1.193379071100862E-12 3.502527117982743E-10 1.46641211074088E-12
i -2.653970297922941E-15 6.338620180637844E-15 1.808298787108933E-12 -1.085401215624902E-12 1.46641211074088E-12 1.528070317361529E-13

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 13.92   n/a E2021B10  
diameter diameter 4.468 km 0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.185   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21071 (1991 PE7)          Discovered 1991-Aug-06 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 PE7 = 2000 XB36 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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