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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2073041363218969 4.3453e-08  
a 2.627157083413927 1.3299e-08 au
q 2.082536553254849 1.1657e-07 au
i 6.076524469784196 5.415e-06 deg
node 168.1067529119446 3.88e-05 deg
peri 125.4672613952048 4.0551e-05 deg
M 336.0343351448176 1.126e-05 deg
tp 2459104.041504042006
(2020-Sep-11.54150404)
4.8779e-05 TDB
period 1555.347689303171
4.26
1.181e-05
3.233e-08
d
yr
n .2314595009693862 1.7575e-09 deg/d
Q 3.171777613573005 1.6056e-08 au
  Orbit Determination Parameters
   # obs. used (total)      822  
   data-arc span      14368 days (39.34 yr)  
   first obs. used      1981-02-13  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5843  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 17:20:11  

Additional Information
 Earth MOID = 1.07375 au 
 Jupiter MOID = 2.06781 au 
 T_jup = 3.363 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456884.5 (2014-Aug-15.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2056736513042674 4.3345e-08  
q 2.089318796563686 1.1587e-07 au
tp 2457547.946909678583
(2016-Jun-08.44690968)
4.869e-05 TDB
node 168.1580962001608 3.8869e-05 deg
peri 125.0631576524371 4.0637e-05 deg
i 6.067303796084818 5.4089e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      822  
   data-arc span      14368 days (39.34 yr)  
   first obs. used      1981-02-13  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5843  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 17:20:11  

Additional Information
 Jupiter MOID = 2.06781 au 
 T_jup = 3.363 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.878783184162683E-15 -5.001475421615424E-15 7.702533687315401E-13 -5.002881592792881E-16 2.022706454758275E-13 -3.314235170978901E-15
q -5.001475421615424E-15 1.342640001322374E-14 -2.049210461413596E-12 -5.021297075409787E-16 -5.526083041260283E-13 8.440306783517669E-15
tp 7.702533687315401E-13 -2.049210461413596E-12 2.370741106012924E-9 3.483837377071928E-13 5.890346307285198E-10 -3.854531520439104E-12
node -5.002881592792881E-16 -5.021297075409787E-16 3.483837377071928E-13 1.510797591215694E-9 -1.501209798521955E-9 -3.165183055962166E-11
peri 2.022706454758275E-13 -5.526083041260283E-13 5.890346307285198E-10 -1.501209798521955E-9 1.651351293187158E-9 3.063238642993274E-11
i -3.314235170978901E-15 8.440306783517669E-15 -3.854531520439104E-12 -3.165183055962166E-11 3.063238642993274E-11 2.925671086323245E-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

[ show close-approach data ]
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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