Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
4341 Poseidon (1987 KF)
Classification: Apollo [NEO]          SPK-ID: 2004341
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

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 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 
[ show covariance matrix ]

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-15 01:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin