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JPL Small-Body Database Browser
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308 Polyxo
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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 88 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04054222260115872 3.047e-08  
a 2.749537086212404 6.6894e-09 au
q 2.638064741613039 8.5768e-08 au
i 4.360811434829979 3.4496e-06 deg
node 181.7212020388202 4.5404e-05 deg
peri 114.5814899120308 6.5879e-05 deg
M 287.5937390854701 4.8935e-05 deg
tp 2458935.435684155374
(2020-Mar-26.93568416)		 0.00022647 TDB
period 1665.282045682022
4.56		 6.0772e-06
1.664e-08		 d
yr
n .2161795960831132 7.8892e-10 deg/d
Q 2.861009430811768 6.9606e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3011  
   data-arc span      46884 days (128.36 yr)  
   first obs. used      1891-04-06  
   last obs. used      2019-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46846  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:07:26  

Additional Information
 Earth MOID = 1.62539 au 
 Jupiter MOID = 2.21047 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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.029 h n/a LCDB (Rev. 2019-January); 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.]
geometric albedo albedo 0.047   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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          Discovered 1891-Mar-31 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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