1763 Williams

Based on its osculating Keplerian orbital elements, Williams qualifies as a member of the Flora family ({{small|402}}), a giant asteroid family and the largest family of stony asteroids in the main-belt (according to Zappalà but not Nesvorý). However, analysis using proper orbital elements in a hierarchical clustering method showed that Williams is a background asteroid, not belonging to any known family (Nesvorý, Milani and Knežević).

The asteroid orbits the Sun in the inner main-belt at a distance of 1.7–2.6 AU once every 3 years and 3 months (1,183 days). Its orbit has an eccentricity of 0.20 and an inclination of 4° with respect to the ecliptic.

The asteroid was first identified as {{mp|1939 EO}} at Nice Observatory in March 1939. The body's observation arc begins with its official discovery observation in October 1953.

Williams is an assumed S-type asteroid.

In October 2008, a rotational lightcurve of Williams was obtained from photometric observations by Petr Pravec at Ondřejov Observatory in the Czech Republic. Lightcurve analysis gave a rotation period of at least 36 hours with a brightness amplitude of more than 0.30 magnitude ({{small|U=2}}).{{efn|name=lcdb-Pravec-2008}}{{efn|name=lightcurve-plot}} Another observation by Pierre Antonini gave a period of 8 hours ({{small|U=1+}}).

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Williams measures 6.38 and 6.982 kilometers in diameter and its surface has an albedo of 0.32 and 0.3305, respectively.

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the Flora family's largest member and namesake – and calculates a diameter of 7.47 kilometers based on an absolute magnitude of 12.8.

This minor planet was named in honor of Kenneth P. Williams (1887–1958), long-time professor of mathematics at Indiana University. He was known for his textbook, the calculation of the orbits of asteroids and comets, and his detailed analysis of the transits of Mercury from 1723 to 1927. He also wrote Lincoln Finds a General, a five volume book about the American Civil War.

The name was proposed by Frank K. Edmondson, who initiated the Indiana Asteroid Program. The official {{MoMP|1763|naming citation}} was published by the Minor Planet Center on 20 February 1971 ({{small|M.P.C. 3143}}).

{{notelist|refs=

{{efn|name=lcdb-Pravec-2008|1=Pravec (2008) web: rotation period of at least {{val|36}} hours with a brightness amplitude of greater than {{val|0.30}} mag. Quality Code of 2. Summary figures at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1763%7CWilliams Collaborative Asteroid Lightcurve Link (CALL)]}}

{{efn|name=lightcurve-plot|1=[http://www.asu.cas.cz/~asteroid/01763.png Lightcurve plot for (1763) Williams] with a period of {{val|90}} hours (P > 36 h and A > 0.3 mag). [http://www.asu.cas.cz/~ppravec/newres.txt Summary figures] at website of the [http://www.asu.cas.cz/~ppravec/ Ondrejov Asteroid Photometry Project]}}

}}

{{reflist|30em|refs=

{{cite web

|type = 2017-07-05 last obs.

|title = JPL Small-Body Database Browser: 1763 Williams (1953 TN2)

|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001763

|publisher = Jet Propulsion Laboratory

|access-date = 6 September 2017}}

{{cite book

|title = Dictionary of Minor Planet Names – (1763) Williams

|last = Schmadel | first = Lutz D.

|publisher = Springer Berlin Heidelberg

|pages = 140–141

|date = 2007

|isbn = 978-3-540-00238-3

|doi = 10.1007/978-3-540-29925-7_1764 |chapter = (1763) Williams }}

{{cite web

|title = 1763 Williams (1953 TN2)

|work = Minor Planet Center

|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1763

|access-date = 6 September 2017}}

{{cite book

|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)

|chapter = Appendix – Publication Dates of the MPCs

|last = Schmadel |first=Lutz D.

|publisher = Springer Berlin Heidelberg

|page = 221

|isbn = 978-3-642-01964-7

|doi = 10.1007/978-3-642-01965-4}}

{{cite web

|title = Asteroids and comets rotation curves – (1763) Williams

|last = Behrend |first = Raoul

|publisher = Geneva Observatory

|url = http://obswww.unige.ch/~behrend/page4cou.html#001763

|access-date = 6 September 2017}}

{{cite journal

|display-authors = 6

|first1 = Joseph R. |last1 = Masiero

|first2 = A. K. |last2 = Mainzer

|first3 = T. |last3 = Grav

|first4 = J. M. |last4 = Bauer

|first5 = R. M. |last5 = Cutri

|first6 = J. |last6 = Dailey

|first7 = P. R. M. |last7 = Eisenhardt

|first8 = R. S. |last8 = McMillan

|first9 = T. B. |last9 = Spahr

|first10 = M. F. |last10 = Skrutskie

|first11 = D. |last11 = Tholen

|first12 = R. G. |last12 = Walker

|first13 = E. L. |last13 = Wright

|first14 = E. |last14 = DeBaun

|first15 = D. |last15 = Elsbury

|first16 = T. IV |last16 = Gautier

|first17 = S. |last17 = Gomillion

|first18 = A. |last18 = Wilkins

|date = November 2011

|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters

|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M

|journal = The Astrophysical Journal

|volume = 741

|issue = 2

|page = 20

|bibcode = 2011ApJ...741...68M

|doi = 10.1088/0004-637X/741/2/68

|arxiv = 1109.4096

|access-date= 6 September 2017}}

{{cite web

|title = Asteroid 1763 Williams – Asteroid Dynamical Families V4.1

|work = Small Bodies Data Ferret

|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1763+Williams#Asteroid%201763%20WilliamsEAR-A-5-DDR-FAMILY-V4.1

|access-date = 31 October 2019}}

{{cite web

|title = Asteroid 1763 Williams – Proper Elements

|publisher = AstDyS-2, Asteroids – Dynamic Site

|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1763

|access-date= 31 October 2019}}

{{cite web

|title = LCDB Data for (1763) Williams

|publisher = Asteroid Lightcurve Database (LCDB)

|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1763%7CWilliams

|access-date = 6 September 2017}}

{{cite journal

|display-authors = 6

|first1 = C. R. |last1 = Nugent

|first2 = A. |last2 = Mainzer

|first3 = J. |last3 = Masiero

|first4 = J. |last4 = Bauer

|first5 = R. M. |last5 = Cutri

|first6 = T. |last6 = Grav

|first7 = E. |last7 = Kramer

|first8 = S. |last8 = Sonnett

|first9 = R. |last9 = Stevenson

|first10 = E. L. |last10 = Wright

|date = December 2015

|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos

|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N

|journal = The Astrophysical Journal

|volume = 814

|issue = 2

|page = 13

|bibcode = 2015ApJ...814..117N

|doi = 10.1088/0004-637X/814/2/117

|arxiv = 1509.02522

|access-date= 6 September 2017}}

{{cite journal

|display-authors = 6

|first1 = A. |last1 = Mainzer

|first2 = T. |last2 = Grav

|first3 = J. |last3 = Masiero

|first4 = E. |last4 = Hand

|first5 = J. |last5 = Bauer

|first6 = D. |last6 = Tholen

|first7 = R. S. |last7 = McMillan

|first8 = T. |last8 = Spahr

|first9 = R. M. |last9 = Cutri

|first10 = E. |last10 = Wright

|first11 = J. |last11 = Watkins

|first12 = W. |last12 = Mo

|first13 = C. |last13 = Maleszewski

|date = November 2011

|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results

|journal = The Astrophysical Journal

|volume = 741

|issue = 2

|page = 25

|bibcode = 2011ApJ...741...90M

|doi = 10.1088/0004-637X/741/2/90

|arxiv = 1109.6407}}

{{cite journal

|display-authors = 6

|first1 = Peter |last1 = Veres

|first2 = Robert |last2 = Jedicke

|first3 = Alan |last3 = Fitzsimmons

|first4 = Larry |last4 = Denneau

|first5 = Mikael |last5 = Granvik

|first6 = Bryce |last6 = Bolin

|first7 = Serge |last7 = Chastel

|first8 = Richard J. |last8 = Wainscoat

|first9 = William S. |last9 = Burgett

|first10 = Kenneth C. |last10 = Chambers

|first11 = Heather |last11 = Flewelling

|first12 = Nick |last12 = Kaiser

|first13 = Eugen A. |last13 = Magnier

|first14 = Jeff S. |last14 = Morgan

|first15 = Paul A. |last15 = Price

|first16 = John L. |last16 = Tonry

|first17 = Christopher |last17 = Waters

|date = November 2015

|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results

|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V

|journal = Icarus

|volume = 261

|pages = 34–47

|bibcode = 2015Icar..261...34V

|doi = 10.1016/j.icarus.2015.08.007

|arxiv = 1506.00762

|access-date= 6 September 2017}}

}}

• [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
• [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
• [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
• [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
• {{AstDys|1763}}
• {{JPL small body}}

{{Minor planets navigator |1762 Russell |number=1763 |1764 Cogshall}}

{{Small Solar System bodies}}

{{Authority control}}

{{DEFAULTSORT:Williams}}

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Category:Named minor planets

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