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21129 (1993 BJ7)
Classification: Main-belt Asteroid          SPK-ID: 2021129
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07726697578476516 1.759e-08  
a 2.605706123514094 9.9309e-09 au
q 2.404371091566316 4.4382e-08 au
i 15.22266713585438 5.0243e-07 deg
node 140.8151986289921 3.008e-06 deg
peri 103.9690031256883 1.586e-05 deg
M 121.5622486610005 1.3827e-05 deg
tp 2458681.720505614751
(2019-Jul-17.22050561)
5.8262e-05 TDB
period 1536.337308957711
4.21
8.783e-06
2.405e-08
d
yr
n .2343235420379349 1.3396e-09 deg/d
Q 2.807041155461872 1.0698e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2250  
   data-arc span      10245 days (28.05 yr)  
   first obs. used      1993-01-23  
   last obs. used      2021-02-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47476  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:54:27  

Additional Information
 Earth MOID = 1.43879 au 
 Jupiter MOID = 2.33516 au 
 T_jup = 3.358 
[ 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 13.61   n/a E2021B10  
diameter diameter 5.130 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.222   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21129 (1993 BJ7)          Discovered 1993-Jan-23 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1993 BJ7 = 1998 KM59 = 1999 RC220 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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