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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1004080240564752 8.4971e-08  
a 3.013026574287946 3.5489e-08 AU
q 2.710494529534043 2.6243e-07 AU
i 9.518558385473026 8.5898e-06 deg
node 301.0507646562363 3.7938e-05 deg
peri 19.44658672227517 5.3273e-05 deg
M 315.9844017047483 4.3807e-05 deg
tp 2457034.064577811446
(2015-Jan-11.56457781)
0.00023436 JED
period 1910.305693179486
5.23
3.375e-05
9.24e-08
d
yr
n .1884515139568165 3.3295e-09 deg/d
Q 3.315558619041849 3.9052e-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 = 1.69819 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. 2013-Sep-12) 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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