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12168 Polko (5141 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2012168
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1003988871573436 8.4979e-08  
a 3.01314531773357 3.5647e-08 AU
q 2.71062888098976 2.6243e-07 AU
i 9.518528567944712 8.59e-06 deg
node 301.0504212701333 3.7937e-05 deg
peri 19.38663865273096 5.327e-05 deg
M 353.7232962909724 4.4108e-05 deg
tp 2457033.808699030537
(2015-Jan-11.30869903)
0.00023435 JED
period 1910.418622078138
5.23
3.3902e-05
9.282e-08
d
yr
n .1884403741879332 3.344e-09 deg/d
Q 3.315661754477381 3.9226e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      880  
   data-arc span      21286 days (58.28 yr)  
   first obs. used      1955-03-24  
   last obs. used      2013-07-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53823  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 20:17:57  

Additional Information
 Earth MOID = 1.7002 AU 
 T_jup = 3.220 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7 mag n/a PDS3 (MPC 36320)  
rotation period rot_per 9.4071 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Molnar, L.A.; Haegert, M.J. (2007) Minor Planet Bul. 34, 126-128.]

12168 Polko           Discovered 1973 Sept. 25 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Norbert Polko (b. 1944) has scanned more than 200~000 glass plates---a world record---from the largest European astronomical plate archive, at the Sonneberg Observatory. The name was suggested by R. Hudec.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20081113/MPCPages.arcLast Updated: 2008-11-17

[ show close-approach data ]
Alternate Designations
 5141 T-2 = 1978 QK3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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