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11682 Shiwaku (1998 EX6)
Classification: Main-belt Asteroid          SPK-ID: 2011682
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1715270649252253 1.3369e-08  
a 2.425900902660762 7.133e-09 au
q 2.009793241027907 3.3122e-08 au
i 3.056091964415128 3.7002e-07 deg
node 76.6077028966309 6.3273e-06 deg
peri 168.311377118243 7.9425e-06 deg
M 311.3743815279986 7.2548e-06 deg
tp 2459386.910618930787
(2021-Jun-21.41061893)
2.8253e-05 TDB
period 1380.091912943458
3.78
6.0869e-06
1.667e-08
d
yr
n .2608521915270067 1.1505e-09 deg/d
Q 2.842008564293617 8.3565e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2505  
   data-arc span      24773 days (67.82 yr)  
   first obs. used      1953-05-18  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48567  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 22:54:32  

Additional Information
 Earth MOID = .995087 au 
 Jupiter MOID = 2.17722 au 
 T_jup = 3.488 
[ 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 13.77   n/a E2021B10  
diameter diameter 4.844 km 0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.01885 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.241   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11682 Shiwaku           Discovered 1998 Mar. 3 by H. Abe at Yatsuka.
Hideaki Shiwaku (b. 1963) is one of promoters of the Matsue Astronomical Club, an amateur astronomers group in the Matsue area of Japan, and a good friend of the discoverer.
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
 1998 EX6 = 1953 KF = 1983 EP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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