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17712 Fatherwilliam (1997 WK7)
Classification: Main-belt Asteroid          SPK-ID: 2017712
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08897697957706008 3.1525e-08  
a 2.270189246788797 6.6507e-09 au
q 2.068194664541209 7.0781e-08 au
i 4.376790932296193 3.4477e-06 deg
node 42.93926806911923 4.314e-05 deg
peri 108.985849135421 4.7076e-05 deg
M 127.5053776446859 1.9184e-05 deg
tp 2458557.995673466717
(2019-Mar-15.49567347)
6.6135e-05 TDB
period 1249.371285310814
3.42
5.4902e-06
1.503e-08
d
yr
n .2881449287594605 1.2662e-09 deg/d
Q 2.472183829036386 7.2424e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2409  
   data-arc span      12921 days (35.38 yr)  
   first obs. used      1985-03-22  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44764  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:15:15  

Additional Information
 Earth MOID = 1.08321 au 
 Jupiter MOID = 2.51478 au 
 T_jup = 3.604 
[ 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 14.0   n/a MPO474002  
diameter diameter 4.419 km 0.177 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.273   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17712 Fatherwilliam           Discovered 1997 Nov. 19 by Y. Shimizu and T. Urata at the Nachi-Katsuura Observatory.
In Lewis Carroll's Alice's Adventures in Wonderland, Father William is a character in a poem that a Caterpillar tells Alice to repeat. He is rather old and in the end gets quite annoyed with a youth who, it emerges later in the poem, is his son, and who asks him one question after another.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1997 WK7 = 1985 FN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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