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1112 Polonia (1928 PE)
Classification: Main-belt Asteroid          SPK-ID: 2001112
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .107427265921706 3.745e-08  
a 3.019357470953686 1.1341e-08 au
q 2.694996153008855 1.122e-07 au
i 8.992525889936088 4.1271e-06 deg
node 302.848646495763 2.5135e-05 deg
peri 87.13042899849845 3.1532e-05 deg
M 117.1626950283085 1.9218e-05 deg
tp 2458376.826804235888
(2018-Sep-15.32680424)
0.0001016 TDB
period 1916.329685151334
5.25
1.0797e-05
2.956e-08
d
yr
n .1878591156779844 1.0584e-09 deg/d
Q 3.343718788898517 1.2559e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2892  
   data-arc span      33574 days (91.92 yr)  
   first obs. used      1928-08-15  
   last obs. used      2020-07-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40032  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:22:23  

Additional Information
 Earth MOID = 1.71919 au 
 Jupiter MOID = 2.11899 au 
 T_jup = 3.219 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.0   n/a MPO502163 IRAS observations used: 13
diameter diameter 39.661 km 0.334 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 18.71 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Polakis, T. (2020) Minor Planet Bull. 47, 177-186.]
geometric albedo albedo 0.097   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.797   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.50, mean=6.47, max.=9.27) deg.
U-B UB 0.447   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.50, mean=6.47, max.=9.27) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo

1112 Polonia (1928 PE)          Discovered 1928-Aug-15 by Shajn, P. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1928 PE = 1933 PA = A908 XA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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