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9712 Nauplius (1973 SO1)
Classification: Jupiter Trojan          SPK-ID: 2009712
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 .127275067871213 3.931e-08  
a 5.231939755068014 9.0396e-08 au
q 4.566044267643635 2.5571e-07 au
i 8.466256465466936 6.3203e-06 deg
node 176.5845812068718 2.596e-05 deg
peri 273.9606320789708 3.9361e-05 deg
M 262.0934276476213 3.2957e-05 deg
tp 2460189.281052236803
0.00041757 TDB
period 4371.117980363569
n .08235879278876315 2.1345e-09 deg/d
Q 5.897835242492394 1.019e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1552  
   data-arc span      17216 days (47.13 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-11-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53446  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:39:43  

Additional Information
 Earth MOID = 3.5962 au 
 Jupiter MOID = .103006 au 
 T_jup = 2.962 
[ 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 10.9   n/a MPO452307  
diameter diameter 33.423 km 4.321 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
rotation period rot_per 19.41 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.; French, L.M. (2014) Minor Planet Bull. 41, 210-212.]
geometric albedo albedo 0.083   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  

9712 Nauplius           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Nauplius, a son of Poseidon and Amymone, was king of Euboea and father of Palamedes. After a false accusation by Odysseus caused the death of Palamedes, Nauplius sailed to Troy to seek vengeance. But this was denied by Agamemnon, so Nauplius returned to Greece, together with his surviving son Oceax. However, Nauplius earned his revenge. He misled the Greeks returning from Troy by placing lights on the cliffs of his land, so that many ships ran aground.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1973 SO1 = 1978 EO9 = 1989 EB8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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