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12972 Eumaios (1973 SF1)
Classification: Jupiter Trojan          SPK-ID: 2012972
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1520925412441479 7.8443e-08  
a 5.141643333102077 1.2297e-07 au
q 4.359637732399551 4.7448e-07 au
i 8.44123691492203 6.9685e-06 deg
node 40.50320841834495 4.1425e-05 deg
peri 339.6330925002267 4.5503e-05 deg
M 336.3995280539671 2.3518e-05 deg
tp 2459279.670506511943
(2021-Mar-06.17050651)
0.00028329 TDB
period 4258.44799096033
11.66
0.00015277
4.183e-07
d
yr
n .08453784119571126 3.0327e-09 deg/d
Q 5.923648933804603 1.4167e-07 au
  Orbit Determination Parameters
   # obs. used (total)      765  
   data-arc span      17116 days (46.86 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52953  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:38:54  

Additional Information
 Earth MOID = 3.36423 au 
 Jupiter MOID = .44013 au 
 T_jup = 2.956 
[ 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 11.7   n/a MPO502267  
diameter diameter 22.991 km 0.193 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 13.4 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. (2016) http://www.planetarysciences.org/PHP/CS3_Lightcurves.php]
geometric albedo albedo 0.084   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

12972 Eumaios           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Eumaios was the pig herder of Odysseus. When Odysseus returned to Ithaca, Eumaios helped him to conquer the suitors of Penelope.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000523/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1973 SF1 = 1997 VP4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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