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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06322682319798364 3.0868e-08  
a 2.248609925816349 6.8796e-09 au
q 2.106437463595528 7.0016e-08 au
i 4.919860266039845 3.8408e-06 deg
node 323.2386949355648 3.5842e-05 deg
peri 229.4672296586481 4.5695e-05 deg
M 273.5712187575059 2.9232e-05 deg
tp 2459496.182417349216
(2021-Oct-08.68241735)
0.00010036 TDB
period 1231.599806400857
3.37
5.6521e-06
1.547e-08
d
yr
n .2923027416284185 1.3414e-09 deg/d
Q 2.390782388037171 7.3145e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1231  
   data-arc span      14617 days (40.02 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-02-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5282  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:35  

Additional Information
 Earth MOID = 1.1095 au 
 Jupiter MOID = 2.58004 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. 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.]

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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