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39881 (1998 EK11)
Classification: Main-belt Asteroid          SPK-ID: 2039881
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1880271205945575 3.0226e-08  
a 2.355851507048036 8.7111e-09 au
q 1.912887531629445 7.0787e-08 au
i 3.856020158551168 3.511e-06 deg
node 92.18343881060952 5.454e-05 deg
peri 165.2510600635616 5.5488e-05 deg
M 344.5036529564717 1.2531e-05 deg
tp 2459057.352180880816
(2020-Jul-26.85218088)
4.6157e-05 TDB
period 1320.749016500726
3.62
7.3255e-06
2.006e-08
d
yr
n .2725726050160584 1.5118e-09 deg/d
Q 2.798815482466627 1.0349e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1380  
   data-arc span      8007 days (21.92 yr)  
   first obs. used      1998-03-01  
   last obs. used      2020-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53699  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:38:01  

Additional Information
 Earth MOID = .898074 au 
 Jupiter MOID = 2.25901 au 
 T_jup = 3.527 
[ 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 14.9   n/a MPO324669  
diameter diameter 2.702 km 0.252 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 59.787 h n/a LCDB (Rev. 2019-August); 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.]
geometric albedo albedo 0.350   0.064 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39881 (1998 EK11)          Discovered 1998-Mar-01 by Elst, E. W. at La Silla
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 EK11 = 1999 RB96 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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