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21127 (1993 BF4)
Classification: Main-belt Asteroid          SPK-ID: 2021127
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .200481070345651 3.5783e-08  
a 2.664870646045321 1.1318e-08 au
q 2.130614526593449 9.7669e-08 au
i 13.11160986658543 3.7974e-06 deg
node 134.2486771633438 1.5432e-05 deg
peri 245.1672618591599 1.7744e-05 deg
M 283.7706224916217 1.1043e-05 deg
tp 2459732.959270506929
(2022-Jun-02.45927051)
4.9964e-05 TDB
period 1588.958762901894
4.35
1.0123e-05
2.772e-08
d
yr
n .226563463070959 1.4434e-09 deg/d
Q 3.199126765497194 1.3587e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1747  
   data-arc span      24217 days (66.30 yr)  
   first obs. used      1955-04-20  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46553  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:40:48  

Additional Information
 Earth MOID = 1.16733 au 
 Jupiter MOID = 2.37497 au 
 T_jup = 3.318 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.15   n/a MPCxxxxx  
diameter diameter 4.238 km 0.163 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.326   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21127 (1993 BF4)          Discovered 1993-Jan-27 by Elst, E. W. at Caussols
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1993 BF4 = 2000 WK145 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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