+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08951148313097861 1.109e-08   a 2.269341087593668 6.4119e-09 au q 2.066209001113091 2.4055e-08 au i 4.376586495639304 5.8102e-07 deg node 42.8929497024573 6.9429e-06 deg peri 109.1479168590248 1.4199e-05 deg M 184.990581369692 1.0376e-05 deg tp 2459807.525608117364 (2022-Aug-16.02560812) 3.6766e-05 TDB period 1248.671189428237 3.42 5.2921e-06 1.449e-08 d yr n .2883064837628255 1.2219e-09 deg/d Q 2.472473174074246 6.9858e-09 au   Orbit Determination Parameters    # obs. used (total)      2605      data-arc span      13057 days (35.75 yr)      first obs. used      1985-03-22      last obs. used      2020-12-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44274      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:10:38   Additional Information  Earth MOID = 1.08098 au   Jupiter MOID = 2.51348 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 13.95   n/a E2021B10   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 ] 2021-Apr-16 01:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin