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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05917551372527819 4.0922e-08  
a 2.554485786230781 1.3261e-08 au
q 2.403322777526654 9.7681e-08 au
i 14.61401802338254 5.392e-06 deg
node 330.27857612032 1.617e-05 deg
peri 296.4190252150471 7.6644e-05 deg
M 68.70731603524084 7.8583e-05 deg
tp 2458715.887385010939
(2019-Aug-20.38738501)		 0.00032563 TDB
period 1491.261008412972
4.08		 1.1612e-05
3.179e-08		 d
yr
n .2414064325219089 1.8798e-09 deg/d
Q 2.70564879493491 1.4046e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1863  
   data-arc span      10695 days (29.28 yr)  
   first obs. used      1991-08-06  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47525  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:15:38  

Additional Information
 Earth MOID = 1.42141 au 
 Jupiter MOID = 2.46254 au 
 T_jup = 3.391 
[ show covariance matrix ]

[ 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 13.9   n/a MPO492972  
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

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