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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1263559384447518 4.3058e-08  
a 2.272033137644986 1.1115e-08 au
q 1.98494825836028 1.0176e-07 au
i 2.867592049112011 4.6769e-06 deg
node 309.1055013321084 9.1159e-05 deg
peri 287.7919643319508 9.3415e-05 deg
M 8.254061104600009 2.2178e-05 deg
tp 2458571.819574008027
(2019-Mar-29.31957401)
7.6974e-05 TDB
period 1250.893739005166
3.42
9.1795e-06
2.513e-08
d
yr
n .2877942296571949 2.1119e-09 deg/d
Q 2.559118016929693 1.252e-08 au
  Orbit Determination Parameters
   # obs. used (total)      866  
   data-arc span      12794 days (35.03 yr)  
   first obs. used      1984-01-25  
   last obs. used      2019-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57175  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:59:01  

Additional Information
 Earth MOID = .975245 au 
 Jupiter MOID = 2.4492 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 15.6   n/a MPO435901  

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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