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4341 Poseidon (1987 KF)
Classification: Apollo [NEO]          SPK-ID: 2004341
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6795653386921561 4.5165e-08  
a 1.835967623809632 5.5652e-09 au
q .5883076637076066 8.4043e-08 au
i 11.85378935732801 6.0499e-06 deg
node 108.1001758242727 2.2002e-05 deg
peri 15.67948395091417 2.4003e-05 deg
M 129.599412830306 1.8095e-05 deg
tp 2458673.387991529052
(2019-Jul-08.88799153)
4.4472e-05 TDB
period 908.6485847257163
2.49
4.1315e-06
1.131e-08
d
yr
n .3961927702871724 1.8014e-09 deg/d
Q 3.083627583911658 9.3471e-09 au
  Orbit Determination Parameters
   # obs. used (total)      530  
   data-arc span      12158 days (33.29 yr)  
   first obs. used      1987-05-29  
   last obs. used      2020-09-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55629  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-01 06:40:15  

Additional Information
 Earth MOID = .194013 au 
 Jupiter MOID = 2.02795 au 
 T_jup = 3.687 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456584.5 (2013-Oct-19.0) TDB
Reference: JPL 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6796410034742495 4.5059e-08  
q .5878866096056774 8.3952e-08 au
tp 2456857.348135214649
(2014-Jul-18.84813521)
3.6876e-05 TDB
node 108.1224464522003 2.2004e-05 deg
peri 15.6260759676597 2.4005e-05 deg
i 11.85488725776036 6.0503e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      530  
   data-arc span      12158 days (33.29 yr)  
   first obs. used      1987-05-29  
   last obs. used      2020-09-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55629  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-01 06:40:15  

Additional Information
 Jupiter MOID = 2.02795 au 
 T_jup = 3.687 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.030328954350761E-15 -3.782036568762169E-15 -5.861146954456747E-13 1.766647695677078E-14 -1.10773399570332E-13 -1.248088029347E-14
q -3.782036568762169E-15 7.047881592268361E-15 1.13661337787042E-12 -3.496544495278052E-14 2.149523019181047E-13 2.60290026937966E-14
tp -5.861146954456747E-13 1.13661337787042E-12 1.35983600116479E-9 -1.453370267852377E-10 3.814393012529578E-10 3.622127855291622E-11
node 1.766647695677078E-14 -3.496544495278052E-14 -1.453370267852377E-10 4.841662050323232E-10 -5.022273291104463E-10 6.847973632327529E-12
peri -1.10773399570332E-13 2.149523019181047E-13 3.814393012529578E-10 -5.022273291104463E-10 5.76254552202363E-10 -2.234578443760281E-12
i -1.248088029347E-14 2.60290026937966E-14 3.622127855291622E-11 6.847973632327529E-12 -2.234578443760281E-12 3.660640911291073E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO416758  
diameter diameter 3.177 km 0.651 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
rotation period rot_per 6.262 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (1998) Icarus 136, 124-153.]
[Krugly, Yu.N.; Bel'skaya, I.N.; Shevchenko, V.G.; et al. (2002) Icarus 158, 294-304.]
geometric albedo albedo 0.054   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
SMASSII spectral type spec_B O   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4341 Poseidon (1987 KF)          Discovered 1987-May-29 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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