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4708 Polydoros (1988 RT)
Classification: Jupiter Trojan          SPK-ID: 2004708
[ 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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05959090838658533 4.6071e-08  
a 5.252287019747064 8.0121e-08 au
q 4.939298465133266 2.399e-07 au
i 6.986111873435175 4.1321e-06 deg
node 281.1784880392177 3.9008e-05 deg
peri 102.9580446048309 5.6751e-05 deg
M 190.3373703604895 4.4128e-05 deg
tp 2461072.571781066623
(2026-Feb-01.07178107)		 0.00056807 TDB
period 4396.641987507371
12.04		 0.0001006
2.754e-07		 d
yr
n .0818806718907077 1.8736e-09 deg/d
Q 5.565275574360863 8.4896e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2328  
   data-arc span      11668 days (31.95 yr)  
   first obs. used      1988-09-11  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44236  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:49:21  

Additional Information
 Earth MOID = 3.95186 au 
 Jupiter MOID = .0246972 au 
 T_jup = 2.982 
[ 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 9.9   n/a MPO435743  
diameter diameter 54.964 km 0.552 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 7.517 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Stephens, R.D.; Coley, D.R.; Warner, B.D.; French, L.M. (2016) Minor Planet Bull. 43, 323-331.]
[Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 301-304.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.064   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

4708 Polydoros (1988 RT)          Discovered 1988-Sep-11 by Shoemaker, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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