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11817 Oguri (1981 EQ34)
Classification: Main-belt Asteroid          SPK-ID: 2011817
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2073041179094674 4.117e-08  
a 2.627157076459221 1.2248e-08 au
q 2.082536596114227 1.1197e-07 au
i 6.076525789483239 4.5064e-06 deg
node 168.1067532778898 3.8769e-05 deg
peri 125.4672556017016 4.0311e-05 deg
M 336.034343555644 9.3571e-06 deg
tp 2459104.041467292637
(2020-Sep-11.54146729)
4.0378e-05 TDB
period 1555.347683127112
4.26
1.0877e-05
2.978e-08
d
yr
n .2314595018884782 1.6186e-09 deg/d
Q 3.171777556804215 1.4787e-08 au
  Orbit Determination Parameters
   # obs. used (total)      912  
   data-arc span      14435 days (39.52 yr)  
   first obs. used      1981-02-13  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56254  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:57:06  

Additional Information
 Earth MOID = 1.07375 au 
 Jupiter MOID = 2.06781 au 
 T_jup = 3.363 
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Orbital Elements at Epoch 2457126.5 (2015-Apr-14.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2060609714282965 4.1185e-08  
q 2.086443490658256 1.1173e-07 au
tp 2457548.670634831038
(2016-Jun-09.17063483)
4.2782e-05 TDB
node 168.1285997209979 3.8769e-05 deg
peri 125.3677385094689 4.0331e-05 deg
i 6.074984926917272 4.5056e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      912  
   data-arc span      14435 days (39.52 yr)  
   first obs. used      1981-02-13  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56254  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:57:06  

Additional Information
 Jupiter MOID = 2.06781 au 
 T_jup = 3.363 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.696218899664847E-15 -4.586031590435576E-15 4.63244213887777E-13 -4.764538324110067E-17 1.486083633125298E-13 -4.061808832897152E-15
q -4.586031590435576E-15 1.248384108721533E-14 -1.346261064198865E-12 9.157881669019584E-16 -4.331899174321398E-13 1.131839888174054E-14
tp 4.63244213887777E-13 -1.346261064198865E-12 1.830279804921484E-9 8.021711835168624E-13 4.916283338006459E-10 -9.372695974427419E-13
node -4.764538324110067E-17 9.157881669019584E-16 8.021711835168624E-13 1.503059519121274E-9 -1.493535460871039E-9 -3.396304228348059E-11
peri 1.486083633125298E-13 -4.331899174321398E-13 4.916283338006459E-10 -1.493535460871039E-9 1.626562933376596E-9 3.342823033740196E-11
i -4.061808832897152E-15 1.131839888174054E-14 -9.372695974427419E-13 -3.396304228348059E-11 3.342823033740196E-11 2.030030039607926E-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 15.2   n/a MPO467801  
rotation period rot_per 43.263 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

11817 Oguri           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring.
Junko Oguri (b. 1977) is a librarian at the National Astronomical Observatory of Japan. She is also a renowned paper cutout artist whose subjects include asteroids and comets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-03-12Last Updated: 2017-04-19

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Alternate Designations
 1981 EQ34 = 1995 SK55 = 1998 FN144 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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