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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1347208016922686 1.5407e-08  
a 2.418736771595745 5.3227e-09 au
q 2.092882614643797 3.6398e-08 au
i 2.239329823449112 4.8519e-07 deg
node 291.2254049714274 2.0708e-05 deg
peri 291.7716161910701 1.9169e-05 deg
M 251.834748972711 5.368e-06 deg
tp 2459809.325579634208
2.0949e-05 TDB
period 1373.982931272634
n .2620119885088781 8.6487e-10 deg/d
Q 2.744590928547694 6.0397e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3940  
   data-arc span      51398 days (140.72 yr)  
   first obs. used      1880-08-10  
   last obs. used      2021-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42211  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 14:19:07  

Additional Information
 Earth MOID = 1.08584 au 
 Jupiter MOID = 2.23878 au 
 T_jup = 3.501 
[ show covariance matrix ]

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] (  
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,]
[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] (  
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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