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21665 Frege (1999 RR1)
Classification: Main-belt Asteroid          SPK-ID: 2021665
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1260935613989296 3.9637e-08  
a 2.27143380545378 8.5664e-09 au
q 1.985020627442189 9.1618e-08 au
i 2.868524969826724 3.1825e-06 deg
node 309.095711857481 8.5771e-05 deg
peri 287.5847891461191 8.7501e-05 deg
M 181.2105871378857 2.0926e-05 deg
tp 2459821.494640263289
(2022-Aug-29.99464026)
7.5033e-05 TDB
period 1250.398817894191
3.42
7.0735e-06
1.937e-08
d
yr
n .2879081416649766 1.6287e-09 deg/d
Q 2.55784698346537 9.6465e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1070  
   data-arc span      13504 days (36.97 yr)  
   first obs. used      1984-01-25  
   last obs. used      2021-01-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55464  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:51:20  

Additional Information
 Earth MOID = .974062 au 
 Jupiter MOID = 2.44842 au 
 T_jup = 3.600 
[ 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 15.68   n/a MPCxxxxx  

21665 Frege           Discovered 1999 Sept. 5 by P. G. Comba at Prescott.
Friedrich Ludwig Gottlob Frege (1848-1925), a professor at Jena, devoted his work to the goal of establishing the logical foundations of arithmetic. He introduced symbols for the concepts---now widely used in logic---of assertion, negation, implication and existential and universal quantifier.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Alternate Designations
 1999 RR1 = 1984 BK2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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