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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 116 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6798486775595314 4.5174e-08  
a 1.835801316144916 5.765e-09 au
q .5877342191017476 8.4087e-08 au
i 11.84679077907927 6.0467e-06 deg
node 108.0899629012707 2.204e-05 deg
peri 15.738371631866 2.4033e-05 deg
M 208.6473907764273 1.8376e-05 deg
tp 2459582.465689564699
(2022-Jan-02.96568956)
4.7854e-05 TDB
period 908.5251251940443
2.49
4.2796e-06
1.172e-08
d
yr
n .3962466089455816 1.8665e-09 deg/d
Q 3.083868413188084 9.6844e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5563  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:13:59  

Additional Information
 Earth MOID = .194202 au 
 Jupiter MOID = 2.02738 au 
 T_jup = 3.687 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456584.5 (2013-Oct-19.0) TDB
Reference: JPL 116 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6796410034321571 4.5059e-08  
q .5878866097130202 8.3951e-08 au
tp 2456857.348135200507
(2014-Jul-18.84813520)
3.6875e-05 TDB
node 108.122446381083 2.2004e-05 deg
peri 15.62607603779449 2.4005e-05 deg
i 11.85488725670528 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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5563  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:13:59  

Additional Information
 Jupiter MOID = 2.02738 au 
 T_jup = 3.687 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.030287483399503E-15 -3.78196387527311E-15 -5.861257527102731E-13 1.767702114318312E-14 -1.107916592323282E-13 -1.247897636519302E-14
q -3.78196387527311E-15 7.047756232671358E-15 1.136663260003558E-12 -3.498943984888104E-14 2.149961695351749E-13 2.602589096974545E-14
tp -5.861257527102731E-13 1.136663260003558E-12 1.359784024802982E-9 -1.453303203570529E-10 3.814311545672296E-10 3.622349471649706E-11
node 1.767702114318312E-14 -3.498943984888104E-14 -1.453303203570529E-10 4.841638529343114E-10 -5.022241573418621E-10 6.84716998485846E-12
peri -1.107916592323282E-13 2.149961695351749E-13 3.814311545672296E-10 -5.022241573418621E-10 5.762513940878095E-10 -2.233029508101114E-12
i -1.247897636519302E-14 2.602589096974545E-14 3.622349471649706E-11 6.84716998485846E-12 -2.233029508101114E-12 3.66063208569654E-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 15.92   n/a E2020-QM5  
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. 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:
[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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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