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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04804825710887112 6.8498e-08  
a 2.329245928427098 1.2973e-08 AU
q 2.217329721188241 1.6136e-07 AU
i 7.210874372903258 7.0186e-06 deg
node 13.75909406025055 4.2581e-05 deg
peri 182.6254232112886 7.4315e-05 deg
M 253.0794554858215 6.1824e-05 deg
tp 2457386.138251808865
(2015-Dec-29.63825181)
0.00022341 JED
period 1298.438679694357
3.55
1.0848e-05
2.97e-08
d
yr
n .2772560657887529 2.3164e-09 deg/d
Q 2.441162135665954 1.3597e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      974  
   data-arc span      21833 days (59.78 yr)  
   first obs. used      1955-03-23  
   last obs. used      2014-12-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48965  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:14:56  

Additional Information
 Earth MOID = 1.21682 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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