Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456992.5 (2014-Dec-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06020551847187167 4.6016e-08  
q 4.946994213102373 2.3945e-07 au
tp 2456696.652184077473
(2014-Feb-08.15218408)
0.00050576 TDB
node 281.1639255846669 3.9011e-05 deg
peri 104.8053472806713 5.6466e-05 deg
i 6.981775906013724 4.1298e-06 deg
  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
 Jupiter MOID = .0246972 au 
 T_jup = 2.982 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.117505892444347E-15 -1.046229766964619E-14 9.706543383375603E-13 -1.14797993933168E-15 9.129721241237528E-15 6.144924917446427E-16
q -1.046229766964619E-14 5.733453413818951E-14 1.454447232468369E-11 1.451686267739572E-14 1.543524759535498E-12 -1.878211850242866E-15
tp 9.706543383375603E-13 1.454447232468369E-11 2.557948747288254E-7 3.488620783115689E-11 2.071190742409784E-8 2.809578050591404E-13
node -1.14797993933168E-15 1.451686267739572E-14 3.488620783115689E-11 1.521868778751188E-9 -1.507530648289276E-9 1.261313613592644E-11
peri 9.129721241237528E-15 1.543524759535498E-12 2.071190742409784E-8 -1.507530648289276E-9 3.188439406145084E-9 -1.250876407833955E-11
i 6.144924917446427E-16 -1.878211850242866E-15 2.809578050591404E-13 1.261313613592644E-11 -1.250876407833955E-11 1.705553297465922E-11

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-29 03:22 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin