+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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.arc Last Updated: 2009-05-11 Alternate Designations  1997 WK7 = 1985 FN1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-25 00:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin