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5554 Keesey (1985 TW1)
Classification: Main-belt Asteroid          SPK-ID: 2005554
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1976313596354036 1.6627e-08  
a 2.243238888602262 6.2666e-09 au
q 1.799904537060785 3.7981e-08 au
i 7.720214805735991 8.2916e-07 deg
node 311.8181551985297 2.0866e-06 deg
peri 73.60862961109362 5.9874e-06 deg
M 163.2360016240806 5.0843e-06 deg
tp 2458644.051261221933
(2019-Jun-09.55126122)
1.6429e-05 TDB
period 1227.18973735603
3.36
5.1423e-06
1.408e-08
d
yr
n .2933531702893938 1.2292e-09 deg/d
Q 2.686573240143738 7.505e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2046  
   data-arc span      16546 days (45.30 yr)  
   first obs. used      1975-12-03  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43454  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 22:20:55  

Additional Information
 Earth MOID = .820083 au 
 Jupiter MOID = 2.82702 au 
 T_jup = 3.595 
[ 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 13.9   n/a MPO400053  
diameter diameter 4.180 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.305   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

5554 Keesey           Discovered 1985 Oct. 15 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Michael S. W. Keesey (1937- ) is a member of the Solar System Dynamics Group at the Jet Propulsion Laboratory. He began his career at JPL in 1970, and his knowledge of fundamental astronomy and celestial mechanics has been put to good use in the ephemeris development efforts for those planets, comets and minor planets that have been mission candidates or targets of ground-based observations. Citation prepared by D. K. Yeomans, a colleague of the honoree.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC22831Last Updated: 2005-11-23

Alternate Designations
 1985 TW1 = 1975 XK7 = 1978 NQ7 = 1982 YJ3 = 1983 AE4 = 1985 TY3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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