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26084 (1981 EK17)
Classification: Main-belt Asteroid          SPK-ID: 2026084
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1216213387641826 2.9936e-08  
a 2.464505884142039 9.5658e-09 au
q 2.164769379120479 7.7179e-08 au
i 5.68819663376687 5.0072e-06 deg
node 206.1275070960897 2.9986e-05 deg
peri 76.15659375406044 3.9119e-05 deg
M 318.637284355628 2.273e-05 deg
tp 2459162.867745155890
(2020-Nov-09.36774516)
8.9064e-05 TDB
period 1413.166117009383
3.87
8.2277e-06
2.253e-08
d
yr
n .2547471211394815 1.4832e-09 deg/d
Q 2.764242389163599 1.0729e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1610  
   data-arc span      14431 days (39.51 yr)  
   first obs. used      1981-02-14  
   last obs. used      2020-08-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50783  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:30:58  

Additional Information
 Earth MOID = 1.15711 au 
 Jupiter MOID = 2.36057 au 
 T_jup = 3.471 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457158.5 (2015-May-16.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1216145977976779 2.9994e-08  
q 2.165785872530599 7.7317e-08 au
tp 2457747.195276307311
(2016-Dec-24.69527631)
9.06e-05 TDB
node 206.201764642387 3.0029e-05 deg
peri 75.56052258273291 3.9093e-05 deg
i 5.682504628305463 5.0037e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1610  
   data-arc span      14431 days (39.51 yr)  
   first obs. used      1981-02-14  
   last obs. used      2020-08-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50783  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:30:58  

Additional Information
 Jupiter MOID = 2.36057 au 
 T_jup = 3.471 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.996580417733669E-16 -2.307250144815207E-15 -2.021334079381931E-13 3.425203262380434E-15 -1.803146940316808E-14 -1.127974531480779E-15
q -2.307250144815207E-15 5.977855416269968E-15 3.407245941051705E-13 -9.072760281664234E-15 -6.739703705829323E-15 3.081818401415677E-15
tp -2.021334079381931E-13 3.407245941051705E-13 8.208281172710637E-9 -2.35327807736739E-11 2.270010960236057E-9 4.545787070277144E-13
node 3.425203262380434E-15 -9.072760281664234E-15 -2.35327807736739E-11 9.017475552813104E-10 -9.03057264270448E-10 3.926885258736675E-12
peri -1.803146940316808E-14 -6.739703705829323E-15 2.270010960236057E-9 -9.03057264270448E-10 1.528300157047131E-9 -3.878984469995911E-12
i -1.127974531480779E-15 3.081818401415677E-15 4.545787070277144E-13 3.926885258736675E-12 -3.878984469995911E-12 2.503715393368044E-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 14.82   n/a E2020-QM5  
rotation period rot_per 121.957 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

26084 (1981 EK17)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010705/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EK17 = 1998 UA8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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