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JPL Small-Body Database Browser
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39489 (1981 EU6)
Classification: Mars-crossing Asteroid          SPK-ID: 2039489
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .290777655702935 4.5105e-08  
a 2.316454191511728 7.8898e-09 au
q 1.64288107216071 1.038e-07 au
i 7.963878641816359 4.2275e-06 deg
node 245.8690115189373 3.7754e-05 deg
peri 71.67074095598682 3.8597e-05 deg
M 295.5188135293027 8.4622e-06 deg
tp 2459231.155874829079
(2021-Jan-16.65587483)
3.0661e-05 TDB
period 1287.75724336591
3.53
6.5791e-06
1.801e-08
d
yr
n .2795557950495704 1.4282e-09 deg/d
Q 2.990027310862745 1.0184e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1034  
   data-arc span      14238 days (38.98 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51283  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:08  

Additional Information
 Earth MOID = .651338 au 
 Jupiter MOID = 2.37893 au 
 T_jup = 3.511 
[ 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 15.1   n/a MPO351108  
rotation period rot_per 2.258 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

39489 (1981 EU6)          Discovered 1981-Mar-06 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EU6 = 1999 JN13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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