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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05994771933354086 2.6916e-08  
a 5.250726811630327 7.2064e-08 au
q 4.935957714429614 1.3643e-07 au
i 6.986365258449111 7.4513e-07 deg
node 281.1748773102845 7.1301e-06 deg
peri 102.8824429568574 2.4036e-05 deg
M 206.8183924041397 2.2928e-05 deg
tp 2461070.457274694441
(2026-Jan-29.95727469)
0.00030232 TDB
period 4394.683078833229
12.03
9.0473e-05
2.477e-07
d
yr
n .08191716980319284 1.6864e-09 deg/d
Q 5.56549590883104 7.6384e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2394  
   data-arc span      11880 days (32.53 yr)  
   first obs. used      1988-09-11  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4406  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:48:05  

Additional Information
 Earth MOID = 3.94724 au 
 Jupiter MOID = .0259663 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 10.02   n/a E2021B10  
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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