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12143 Harwit (4631 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2012143
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04749150462308926 6.3106e-08  
a 2.329159984371319 1.222e-08 au
q 2.218544672205634 1.47e-07 au
i 7.212901855295672 6.7925e-06 deg
node 13.73610819760424 4.048e-05 deg
peri 182.0061806000586 7.0561e-05 deg
M 60.00368277848849 5.762e-05 deg
tp 2457384.092248442269
(2015-Dec-27.59224844)
0.00020778 JED
period 1298.366816056713
3.55
1.0218e-05
2.798e-08
d
yr
n .2772714117057926 2.1821e-09 deg/d
Q 2.439775296537004 1.28e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1065  
   data-arc span      22308 days (61.08 yr)  
   first obs. used      1955-03-23  
   last obs. used      2016-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48441  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:13:29  

Additional Information
 Earth MOID = 1.21632 au 
 Jupiter MOID = 2.51809 au 
 T_jup = 3.560 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO267755  

12143 Harwit           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld at Leiden on Palomar Schmidt plates taken by T. Gehrels.
Czech-born American astrophysicist Martin O. Harwit (b. 1931) pioneered infrared observations and spectroscopy from space. He has helped plan several space-based observatories for NASA and the European Space Agency. From 1987 to 1995 he was director of the Smithsonian Institution's National Air and Space Museum.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070926/MPCPages.arcLast Updated: 2007-09-30

Alternate Designations
 4631 P-L = 1985 SS6 = 1992 SA2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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