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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08882912550485698 3.3875e-08  
a 2.268942903737724 7.166e-09 au
q 2.067394689778251 7.6862e-08 au
i 4.378899493859307 4.025e-06 deg
node 42.96169383238716 4.4743e-05 deg
peri 108.5575686470923 4.9932e-05 deg
M 12.61321718136694 2.1453e-05 deg
tp 2458556.762178200578
(2019-Mar-14.26217820)
7.4379e-05 TDB
period 1248.342561725842
3.42
5.914e-06
1.619e-08
d
yr
n .2883823807964198 1.3662e-09 deg/d
Q 2.470491117697197 7.8025e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2162  
   data-arc span      12467 days (34.13 yr)  
   first obs. used      1985-03-22  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45821  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:32:39  

Additional Information
 Earth MOID = 1.08303 au 
 Jupiter MOID = 2.51853 au 
 T_jup = 3.605 
[ 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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