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20982 (1981 EL17)
Classification: Main-belt Asteroid          SPK-ID: 2020982
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07599735941416608 3.8719e-08  
a 2.622975731127368 1.5103e-08 au
q 2.423636501754247 1.0484e-07 au
i 14.07871912024407 4.8454e-06 deg
node 191.9712920957367 1.4701e-05 deg
peri 45.68567700399691 3.2897e-05 deg
M 80.36808932753539 3.0242e-05 deg
tp 2458854.105507663483
(2020-Jan-05.60550766)
0.0001293 TDB
period 1551.635957561842
4.25
1.3401e-05
3.669e-08
d
yr
n .2320131846942274 2.0039e-09 deg/d
Q 2.82231496050049 1.6251e-08 au
  Orbit Determination Parameters
   # obs. used (total)      961  
   data-arc span      14429 days (39.50 yr)  
   first obs. used      1981-02-14  
   last obs. used      2020-08-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49984  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:36  

Additional Information
 Earth MOID = 1.4331 au 
 Jupiter MOID = 2.17515 au 
 T_jup = 3.357 
[ 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 14.98   n/a E2021B10  
rotation period rot_per 13.4687 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

20982 (1981 EL17)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EL17 = 1998 FT48 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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