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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2308724339709406 3.7325e-08  
a 2.444278047755486 1.128e-08 au
q 1.879961625568438 9.1761e-08 au
i 24.88831195035349 3.7689e-06 deg
node 133.952984376034 1.1058e-05 deg
peri 29.30913378152038 1.3709e-05 deg
M 218.4763549003256 9.4491e-06 deg
tp 2459149.220067053038
(2020-Oct-26.72006705)
3.7756e-05 TDB
period 1395.80367648083
3.82
9.6624e-06
2.645e-08
d
yr
n .2579159276236112 1.7854e-09 deg/d
Q 3.008594469942535 1.3885e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      14312 days (39.18 yr)  
   first obs. used      1980-09-30  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45307  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:28:26  

Additional Information
 Earth MOID = .915492 au 
 Jupiter MOID = 2.07092 au 
 T_jup = 3.339 
[ 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-January); 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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