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20392 Mikeshepard (1998 MA8)
Classification: Main-belt Asteroid          SPK-ID: 2020392
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09391310878185452 4.1923e-08  
a 2.89751205403539 1.8063e-08 au
q 2.62539768930803 1.2055e-07 au
i 15.90436981024465 4.3196e-06 deg
node 252.8730192773502 1.7063e-05 deg
peri 52.78995648919194 2.9562e-05 deg
M 164.4790967547425 2.4816e-05 deg
tp 2458177.415325235761
(2018-Feb-27.91532524)
0.00012358 TDB
period 1801.508451599533
4.93
1.6846e-05
4.612e-08
d
yr
n .1998325346075181 1.8686e-09 deg/d
Q 3.169626418762751 1.9759e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1540  
   data-arc span      15728 days (43.06 yr)  
   first obs. used      1977-03-20  
   last obs. used      2020-04-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46622  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:11:46  

Additional Information
 Earth MOID = 1.64009 au 
 Jupiter MOID = 2.02325 au 
 T_jup = 3.225 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.3   n/a MPO333007  
diameter diameter 11.864 km 0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 29.2 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:
[Warner, B.D. (2015) Minor Planet Bull. 42, 108-114.]
geometric albedo albedo 0.023   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

20392 Mikeshepard           Discovered 1998 June 19 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Michael Shepard (b. 1962), a professor of geology and geosciences at Bloomsburg University of Pennsylvania, specializes in radar and optical remote sensing of the minor and the terrestrial planets. The name was suggested by S. J. Ostro.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080321/MPCPages.arcLast Updated: 2008-03-26

Alternate Designations
 1998 MA8 = 1977 FQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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