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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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05905252165793944 1.7502e-08  
a 2.554222889583063 1.1238e-08 au
q 2.403389587076755 4.0864e-08 au
i 14.61446767580203 3.9175e-07 deg
node 330.2794694821018 3.185e-06 deg
peri 296.3156147547839 1.8383e-05 deg
M 117.110433037918 1.6912e-05 deg
tp 2458715.457602704899
(2019-Aug-19.95760270)
6.984e-05 TDB
period 1491.030803119818
4.08
9.8399e-06
2.694e-08
d
yr
n .2414437040782388 1.5934e-09 deg/d
Q 2.705056192089371 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.      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 = 1.41967 au 
 Jupiter MOID = 2.46153 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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2059-Jun-16 02:25 00:02 Iris 0.0405712517579814 0.0405672919446651 0.0405752139145419 6.67749040405151 6.6774903828317 2473260.600967629 1.7973284832942 541.270830348806 52.0796889610066 -69.2932967715371 109061.03961231 T 35 CATAB v2.0f-lin.ifort 2021-Apr-13 03:40:07 2021-Apr-13 03:40

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