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9134 Encke (4822 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2009134
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03012732254083558 3.748e-08  
a 2.906440035784744 1.4363e-08 au
q 2.818876779381059 1.1095e-07 au
i 2.748449420434602 4.1508e-06 deg
node 135.6417951692663 6.9374e-05 deg
peri 180.9520957573232 9.3294e-05 deg
M 58.61263995929433 6.0485e-05 deg
tp 2458705.834521068140
(2019-Aug-10.33452107)
0.00030487 TDB
period 1809.841230306984
4.96
1.3415e-05
3.673e-08
d
yr
n .1989124758412853 1.4744e-09 deg/d
Q 2.994003292188429 1.4795e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1432  
   data-arc span      21622 days (59.20 yr)  
   first obs. used      1960-09-24  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5389  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 22:49:07  

Additional Information
 Earth MOID = 1.80503 au 
 Jupiter MOID = 2.08732 au 
 T_jup = 3.283 
[ 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 14.3   n/a MPO302121  

9134 Encke           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Named in memory of Johann Franz Encke (1791-1865), eminent German astronomer. Beginning in 1816, Encke was assistant professor and director of the Seeberg Observatory, near Gotha. He computed the orbit of a short-period comet discovered by Pons and demonstrated that this object had been observed repeatedly. Later it was named comet 2P/Encke. In 1825 Encke was appointed director of the Berlin Observatory and member of the Berlin Academy of Sciences. Encke is most famous for editing the Berliner Astronomisches Jahrbuch from 1830 to 1866. This contained several very important papers on orbit determination and perturbation computations.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

[ show close-approach data ]
Alternate Designations
 4822 P-L = 1992 AX2 
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