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18434 Mikesandras (1994 EW7)
Classification: Main-belt Asteroid          SPK-ID: 2018434
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2306936183166891 3.5541e-08  
a 2.444812613740647 1.1095e-08 au
q 1.880809945770535 8.7953e-08 au
i 24.88848847910731 3.5431e-06 deg
node 133.9447866332455 1.0875e-05 deg
peri 29.25949837397112 1.3565e-05 deg
M 321.66995124654 9.5969e-06 deg
tp 2459149.163264120991
(2020-Oct-26.66326412)
3.7541e-05 TDB
period 1396.26159694685
3.82
9.5049e-06
2.602e-08
d
yr
n .257831341051847 1.7552e-09 deg/d
Q 3.008815281710759 1.3655e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1743  
   data-arc span      14370 days (39.34 yr)  
   first obs. used      1980-09-30  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4382  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:25:48  

Additional Information
 Earth MOID = .9158 au 
 Jupiter MOID = 2.06907 au 
 T_jup = 3.338 
[ 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 13.6   n/a MPO421795  
diameter diameter 4.574 km 0.193 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.137 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:
[Carbo, L.; Green, D.; Kragh, K.; Krotz, J.; et al. (2009) Minor Planet Bull. 36, 152-157.]
geometric albedo albedo 0.368   0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18434 Mikesandras           Discovered 1994 Mar. 12 by C. S. Shoemaker and D. H. Levy at Palomar.
Michael Sandras (b. 1963) has almost single-handedly made the Kenner Planetarium and Observatory, near New Orleans, one of the foremost astronomy education facilities in the United States. A first-rate amateur astronomer, Sandras has also served as president of the Pontchartrain Astronomy Society for many years.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030501/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1994 EW7 = 1998 KZ61 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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