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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0595909069195172 4.6118e-08  
a 5.252287018253117 8.0147e-08 au
q 4.939298471433808 2.4007e-07 au
i 6.986111653823603 4.1394e-06 deg
node 281.1784866831669 3.9038e-05 deg
peri 102.9580470544044 5.6795e-05 deg
M 190.3373694738897 4.4148e-05 deg
tp 2461072.571791010511
(2026-Feb-01.07179101)
0.00056827 TDB
period 4396.641985631516
12.04
0.00010064
2.755e-07
d
yr
n .08188067192564259 1.8742e-09 deg/d
Q 5.565275565072428 8.4923e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2314  
   data-arc span      11652 days (31.90 yr)  
   first obs. used      1988-09-11  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44146  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:19:06  

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. 2019-August); 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.]
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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