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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 ]

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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1219524960697215 2.9906e-08  
a 2.4654661249018 9.5727e-09 au
q 2.164796376994682 7.7167e-08 au
i 5.687354681996299 4.9823e-06 deg
node 206.1078689597609 2.9989e-05 deg
peri 76.0892781938273 3.8924e-05 deg
M 9.650516738669978 2.2426e-05 deg
tp 2459162.595126281812
(2020-Nov-09.09512628)
8.8117e-05 TDB
period 1413.992111310334
3.87
8.2352e-06
2.255e-08
d
yr
n .2545983086612775 1.4828e-09 deg/d
Q 2.766135872808918 1.074e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1630  
   data-arc span      14431 days (39.51 yr)  
   first obs. used      1981-02-14  
   last obs. used      2020-08-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50514  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 05:11:52  

Additional Information
 Earth MOID = 1.15526 au 
 Jupiter MOID = 2.35764 au 
 T_jup = 3.470 
[ 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 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2120-Feb-22 19:53 < 00:01 Eunom 0.0255945561388084 0.0255818847491334 0.0256072322437977 6.10275582016987 6.10275573029872 2495426.328164363 0.412452398295754 836.656377341515 37.4967709284578 -41.0193796524088 67073.8041222777 T 31 CATAB v2.0f-lin.ifort 2021-Apr-13 05:11:55 2021-Apr-13 05:11

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