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1868 Thersites (2008 P-L)
Classification: Jupiter Trojan          SPK-ID: 2001868
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1104840541014783 5.447e-08  
a 5.312039759134989 6.893e-08 au
q 4.725144070997515 3.2171e-07 au
i 16.75358716464739 4.5842e-06 deg
node 197.788748709342 1.3054e-05 deg
peri 170.4943851645959 2.3276e-05 deg
M 341.3047307804076 1.7141e-05 deg
tp 2459232.730696699352
(2021-Jan-18.23069670)
0.00021143 TDB
period 4471.882690202272
12.24
8.7042e-05
2.383e-07
d
yr
n .08050300621452941 1.5669e-09 deg/d
Q 5.898935447272463 7.6545e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2470  
   data-arc span      24324 days (66.60 yr)  
   first obs. used      1954-03-28  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42357  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:14:45  

Additional Information
 Earth MOID = 3.72615 au 
 Jupiter MOID = .218321 au 
 T_jup = 2.903 
[ 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 9.5   n/a MPO425819  
diameter diameter 68.163 km 0.809 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 10.48 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[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, 48-50.]
geometric albedo albedo 0.055   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

1868 Thersites (2008 P-L)          Discovered 1960-Sep-24 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 2008 P-L = 1972 RB2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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