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20979 (1981 EO13)
Classification: Main-belt Asteroid          SPK-ID: 2020979
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06341751139658018 4.0699e-08  
a 2.24838659162338 7.9742e-09 au
q 2.105799509325186 8.9681e-08 au
i 4.919417429834644 4.3687e-06 deg
node 323.2441613598472 3.9556e-05 deg
peri 229.8136267674989 4.8978e-05 deg
M 97.78187325813003 2.9188e-05 deg
tp 2458266.027235958797
(2018-May-27.52723596)
9.9538e-05 TDB
period 1231.416325365006
3.37
6.551e-06
1.794e-08
d
yr
n .2923462947377215 1.5553e-09 deg/d
Q 2.390973673921574 8.4799e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1008  
   data-arc span      14140 days (38.71 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55361  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:25:59  

Additional Information
 Earth MOID = 1.10983 au 
 Jupiter MOID = 2.58224 au 
 T_jup = 3.621 
[ 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 15.7   n/a MPO492972  
rotation period rot_per 10.892 h n/a LCDB (Rev. 2019-January); 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.]

20979 (1981 EO13)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EO13 = 1998 FZ115 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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