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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05889471569410523 1.7497e-08  
a 2.554583391112319 1.121e-08 au
q 2.404131928575876 4.0861e-08 au
i 14.61440909382495 3.9176e-07 deg
node 330.2782954211971 3.1848e-06 deg
peri 296.3569504143382 1.8443e-05 deg
M 164.3954333125205 1.7001e-05 deg
tp 2458715.470692643697
(2019-Aug-19.97069264)		 7.0094e-05 TDB
period 1491.346479084931
4.08		 9.8165e-06
2.688e-08		 d
yr
n .2413925972594181 1.5889e-09 deg/d
Q 2.705034853648763 1.187e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47282  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:38:27  

Additional Information
 Earth MOID = 1.42187 au 
 Jupiter MOID = 2.46048 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 13.92   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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