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18239 Ekers (1251 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2018239
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 .1565383187737286 3.7015e-08  
a 3.089304644620354 1.598e-08 au
q 2.605710089371613 1.1117e-07 au
i 1.245833871464042 4.338e-06 deg
node 152.0198878826426 0.00023023 deg
peri 311.9354166436422 0.00023087 deg
M 186.680231529056 1.7765e-05 deg
tp 2460155.349955843829
(2023-Jul-29.84995584)
0.00010172 TDB
period 1983.305119412303
5.43
1.5388e-05
4.213e-08
d
yr
n .1815151871874742 1.4083e-09 deg/d
Q 3.572899199869096 1.8481e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1637  
   data-arc span      17125 days (46.89 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53563  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:25:35  

Additional Information
 Earth MOID = 1.62263 au 
 Jupiter MOID = 1.57293 au 
 T_jup = 3.206 
[ 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 13.56   n/a E2021B10  
diameter diameter 10.257 km 0.481 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.061   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18239 Ekers           Discovered 1973 Sept. 29 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Ronald Ekers, current president of the IAU and ex-director of the Australian Telescope National Facility and of the Very Large Array, is well known for his contributions to radio astronomy and his innovative exploitation of radio techniques to study galaxies.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20031110/MPCPages.arcLast Updated: 2003-11-12

[ show close-approach data ]
Alternate Designations
 1251 T-2 = 1981 EU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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