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308 Polyxo (A891 FA)
Classification: Main-belt Asteroid          SPK-ID: 2000308
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 94 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04030899076422563 2.899e-08  
a 2.750310383154447 6.3742e-09 au
q 2.63944814732112 8.0877e-08 au
i 4.360691774434478 3.3459e-06 deg
node 181.6139848488635 4.2387e-05 deg
peri 113.0063432482316 6.0901e-05 deg
M 15.60388509743809 4.3848e-05 deg
tp 2458928.289353648960
0.00020293 TDB
period 1665.98462652373
n .2160884285896334 7.5122e-10 deg/d
Q 2.861172618987773 6.6311e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3844  
   data-arc span      47340 days (129.61 yr)  
   first obs. used      1891-04-06  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42637  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:52:35  

Additional Information
 Earth MOID = 1.62747 au 
 Jupiter MOID = 2.20605 au 
 T_jup = 3.341 
[ 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 8.1   n/a MPO492752 IRAS observations used: 6
magnitude slope G 0.21   n/a PDS3 (MPC 17258) Fit
diameter diameter 128.578 km 1.557 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.029 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Debehogne, H.; Zappala, V. (1980) Astron. Astrophys. Suppl. Ser. 39, 163-165.]
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Higgins, D. (2011) Minor Planet Bull. 38, 41-46.]
[Pilcher, F.; Strabla, L.P.; Quadri, U.; Girelli, R. (2014) Minor Planet Bull. 41, 204.]
[Carbognani, A.; Cellino, A.; Caminiti, S. (2019) Planet. Space Sci. 169, 15-34.]
geometric albedo albedo 0.047   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.783   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.76, mean=11.65, max.=19.25) deg.
U-B UB 0.379   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.16, mean=13.25, max.=19.25) deg.
Tholen spectral type spec_T T   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B T   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)

308 Polyxo (A891 FA)          Discovered 1891-Mar-31 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A891 FA = 1950 FQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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