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142 Polana (A875 BA)
Classification: Main-belt Asteroid          SPK-ID: 2000142
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1348849865070338 1.5463e-08  
a 2.418331315021398 5.4361e-09 au
q 2.092134728225199 3.6474e-08 au
i 2.23951481752092 4.8572e-07 deg
node 291.2226311674079 2.0726e-05 deg
peri 291.8147487117885 1.9176e-05 deg
M 200.4376084867352 5.3232e-06 deg
tp 2459809.335773385803
(2022-Aug-17.83577339)
2.0987e-05 TDB
period 1373.637461435692
3.76
4.6317e-06
1.268e-08
d
yr
n .2620778845269238 8.8368e-10 deg/d
Q 2.744527901817596 6.1694e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3840  
   data-arc span      44921 days (122.99 yr)  
   first obs. used      1898-03-27  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4244  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:55:17  

Additional Information
 Earth MOID = 1.0834 au 
 Jupiter MOID = 2.24002 au 
 T_jup = 3.502 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456464.5 (2013-Jun-21.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1354468634370099 1.5548e-08  
q 2.09123437893253 3.6764e-08 au
tp 2457061.019463455913
(2015-Feb-07.51946346)
1.9389e-05 TDB
node 291.2930191375238 2.0752e-05 deg
peri 291.6560790048674 1.9206e-05 deg
i 2.237930188718899 4.8549e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3840  
   data-arc span      44921 days (122.99 yr)  
   first obs. used      1898-03-27  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4244  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:55:17  

Additional Information
 Jupiter MOID = 2.24002 au 
 T_jup = 3.502 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.417368364720898E-16 -5.671317534489656E-16 -1.081469110235028E-14 8.440745653234866E-15 -2.525169799800247E-14 -3.752618894166106E-16
q -5.671317534489656E-16 1.351590611048753E-15 2.069534466703743E-14 -2.907827048344236E-14 6.72202231359228E-14 1.13454226071694E-15
tp -1.081469110235028E-14 2.069534466703743E-14 3.759167511591477E-10 1.460210386079373E-10 -2.601254805795498E-11 -5.72379781787111E-12
node 8.440745653234866E-15 -2.907827048344236E-14 1.460210386079373E-10 4.306653673276507E-10 -3.799708963621793E-10 -3.659077918306306E-13
peri -2.525169799800247E-14 6.72202231359228E-14 -2.601254805795498E-11 -3.799708963621793E-10 3.688770563564316E-10 -1.460137846699797E-12
i -3.752618894166106E-16 1.13454226071694E-15 -5.72379781787111E-12 -3.659077918306306E-13 -1.460137846699797E-12 2.35697763630667E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.29   n/a MPCxxxxx IRAS observations used: 6
diameter diameter 54.812 km 0.277 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.764 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Dotto, E.; Rotundi, A.; De Sanctis, M.C. (1992) in Physical Properties of Small Solar System Bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, p. 211.]
[Barucci, M.A.; Di Martino, M.; Dotto, E.; Fulchignoni, M.; et al. (1994) Icarus 109, 267-273.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2018) Minor Planet Bull. 45, 246-247.]
geometric albedo albedo 0.047   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.621   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=1.32, mean=10.93, max.=25.85) deg.
U-B UB 0.236   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=1.32, mean=10.93, max.=25.85) deg.
Tholen spectral type spec_T F   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

142 Polana (A875 BA)          Discovered 1875-Jan-28 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A875 BA = 1954 BH = 1956 XZ = 1963 SA = A923 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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