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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05905250811459024 4.0689e-08  
a 2.554222889843805 1.3138e-08 au
q 2.403389621914831 9.6859e-08 au
i 14.61448379371716 5.124e-06 deg
node 330.2794720231669 1.6161e-05 deg
peri 296.3155104349208 7.6635e-05 deg
M 117.1105390892857 7.8608e-05 deg
tp 2458715.457163392138
(2019-Aug-19.95716339)
0.00032575 TDB
period 1491.03080334813
4.08
1.1504e-05
3.15e-08
d
yr
n .2414437040412679 1.8629e-09 deg/d
Q 2.705056157772778 1.3914e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1984  
   data-arc span      10758 days (29.45 yr)  
   first obs. used      1991-08-06  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4726  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:50:45  

Additional Information
 Earth MOID = 1.41967 au 
 Jupiter MOID = 2.46153 au 
 T_jup = 3.391 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457390.5 (2016-Jan-03.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05859372214659136 4.0763e-08  
q 2.405434081764252 9.718e-08 au
tp 2457228.091225120736
(2015-Jul-24.59122512)
0.00032911 TDB
node 330.3515691413108 1.6167e-05 deg
peri 297.3812872640383 7.7153e-05 deg
i 14.60849300244329 5.1237e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1984  
   data-arc span      10758 days (29.45 yr)  
   first obs. used      1991-08-06  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4726  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:50:45  

Additional Information
 Jupiter MOID = 2.46153 au 
 T_jup = 3.391 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.661650585384761E-15 -3.940493549112062E-15 1.881083333141434E-12 1.694206448275579E-15 3.87382026252938E-13 2.536875939005953E-15
q -3.940493549112062E-15 9.443886285125718E-15 -5.312228996253845E-12 -3.733341843109775E-15 -1.113253070645724E-12 -4.861655414110166E-15
tp 1.881083333141434E-12 -5.312228996253845E-12 1.083137160524865E-7 1.378424513570251E-10 2.484478780659078E-8 -8.055393052217937E-11
node 1.694206448275579E-15 -3.733341843109775E-15 1.378424513570251E-10 2.613825703234671E-10 -2.207614371074434E-10 3.591462537751964E-11
peri 3.87382026252938E-13 -1.113253070645724E-12 2.484478780659078E-8 -2.207614371074434E-10 5.952580470049016E-9 -5.349935881375523E-11
i 2.536875939005953E-15 -4.861655414110166E-15 -8.055393052217937E-11 3.591462537751964E-11 -5.349935881375523E-11 2.625181393214297E-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 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

[ 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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