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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1348849865167611 1.5465e-08  
a 2.418331315043462 5.4365e-09 au
q 2.092134728220763 3.6476e-08 au
i 2.239514817985877 4.8574e-07 deg
node 291.2226311792924 2.0726e-05 deg
peri 291.8147486936635 1.9176e-05 deg
M 200.4376084826633 5.3234e-06 deg
tp 2459809.335773409672
(2022-Aug-17.83577341)
2.0988e-05 TDB
period 1373.637461454491
3.76
4.632e-06
1.268e-08
d
yr
n .2620778845233371 8.8375e-10 deg/d
Q 2.744527901866161 6.1699e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3836  
   data-arc span      44908 days (122.95 yr)  
   first obs. used      1898-03-27  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42461  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:21:42  

Additional Information
 Earth MOID = 1.0834 au 
 Jupiter MOID = 2.24002 au 
 T_jup = 3.502 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456462.5 (2013-Jun-19.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1354539065032557 1.5549e-08  
q 2.091205004121042 3.6766e-08 au
tp 2457061.013938415426
(2015-Feb-07.51393842)
1.9389e-05 TDB
node 291.2932596416957 2.0753e-05 deg
peri 291.6560294788958 1.9207e-05 deg
i 2.237922371845049 4.8551e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3836  
   data-arc span      44908 days (122.95 yr)  
   first obs. used      1898-03-27  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42461  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:21:42  

Additional Information
 Jupiter MOID = 2.24002 au 
 T_jup = 3.502 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.417749879150323E-16 -5.67208912257479E-16 -1.085348294757599E-14 8.4172541894992E-15 -2.52440586690585E-14 -3.745397694470554E-16
q -5.67208912257479E-16 1.351742899624594E-15 2.076634305571451E-14 -2.903217136024201E-14 6.720416886607117E-14 1.133148390656331E-15
tp -1.085348294757599E-14 2.076634305571451E-14 3.759164437655228E-10 1.460457056477272E-10 -2.602929636814497E-11 -5.724393809708059E-12
node 8.4172541894992E-15 -2.903217136024201E-14 1.460457056477272E-10 4.307007683173826E-10 -3.79994441431381E-10 -3.664706550471644E-13
peri -2.52440586690585E-14 6.720416886607117E-14 -2.602929636814497E-11 -3.79994441431381E-10 3.688941674243962E-10 -1.45989684090815E-12
i -3.745397694470554E-16 1.133148390656331E-15 -5.724393809708059E-12 -3.664706550471644E-13 -1.45989684090815E-12 2.35715842739982E-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 10.3   n/a MPO492750 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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