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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04804825522078903 6.8394e-08  
a 2.329245928140253 1.2963e-08 AU
q 2.217329725312987 1.6115e-07 AU
i 7.210874135173849 6.9955e-06 deg
node 13.75909493585172 4.2529e-05 deg
peri 182.625423372034 7.4258e-05 deg
M 253.0794546153848 6.1799e-05 deg
tp 2457386.138254877098
(2015-Dec-29.63825488)
0.00022333 JED
period 1298.438679454504
3.55
1.0839e-05
2.968e-08
d
yr
n .2772560658399686 2.3145e-09 deg/d
Q 2.44116213096752 1.3586e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      977  
   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      .48962  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:29:50  

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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