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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 114 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6795653375083117 4.5191e-08  
a 1.835967623949063 5.5688e-09 au
q .588307665925785 8.4093e-08 au
i 11.85378950686586 6.0582e-06 deg
node 108.1001746290207 2.2428e-05 deg
peri 15.6794845031935 2.4486e-05 deg
M 129.5994130964189 1.8134e-05 deg
tp 2458673.387990820113
(2019-Jul-08.88799082)
4.4573e-05 TDB
period 908.6485848292261
2.49
4.1341e-06
1.132e-08
d
yr
n .3961927702420396 1.8026e-09 deg/d
Q 3.083627581972342 9.3532e-09 au
  Orbit Determination Parameters
   # obs. used (total)      526  
   data-arc span      12139 days (33.23 yr)  
   first obs. used      1987-05-29  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55718  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-23 06:56:17  

Additional Information
 Earth MOID = .194013 au 
 Jupiter MOID = 2.02795 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 15.9   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

[ 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 2020-Sep-22 06:11 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin