1046 Edwin

{{Short description|Background asteroid}} {{Use dmy dates|date=March 2018}} {{Infobox planet | minorplanet = yes | name = 1046 Edwin | background = #D6D6D6 | image = Orbit of 1046 Edwin.gif | image_scale = | caption = Orbital diagram of 1046 Edwin | discovery_ref = <ref name="MPC-object" /> | discoverer = G. van Biesbroeck | discovery_site = Yerkes Obs. | discovered = 1 December 1924 | mpc_name = (1046) Edwin | alt_names = 1924 UA{{·}}1949 RB 1949 YL | pronounced = | named_after = {{nowrap|Edwin Van Biesbroeck<ref name="springer" />}} {{small|(discoverer's son)}} | mp_category = main-belt<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|(outer)}}<ref name="lcdb" /> background<ref name="Ferret" /> | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 91.86 yr (33,553 d) | aphelion = 3.1769 AU | perihelion = 2.7895 AU | semimajor = 2.9832 AU | eccentricity = 0.0649 | period = 5.15 yr (1,882 d) | mean_anomaly = 53.846° | mean_motion = {{Deg2DMS|0.1913|sup=ms}} / day | inclination = 7.8991° | asc_node = 10.745° | arg_peri = 47.898° | mean_diameter = {{val|25.15|0.66|ul=km}}<ref name="AKARI" /> {{val|29.084|0.405|u=km}}<ref name="Masiero-2014" /> {{val|36.355|0.604|u=km}}<ref name="WISE" /> {{val|42.23|u=km}} {{small|(calculated)}}<ref name="lcdb" /> | rotation = {{val|5.29|0.01|u=h}}<ref name="Koff-2002a" />{{efn|name=lightcurve-plot-Koff}} {{val|5.2906|0.0001|u=h}}<ref name="geneva-obs" /> {{val|5.296|0.006|u=h}}<ref name="geneva-obs" /> {{val|5.30|0.02|u=h}}<ref name="Ditteon-2007" /> | albedo = 0.057 {{small|(assumed)}}<ref name="lcdb" /> {{val|0.1113|0.0145}}<ref name="WISE" /> {{val|0.201|0.039}}<ref name="Masiero-2014" /> {{val|0.235|0.014}}<ref name="AKARI" /> | spectral_type = SMASS {{=}} X e<ref name="jpldata" />{{·}}M<ref name="WISE" /> | abs_magnitude = 10.20<ref name="AKARI" /><ref name="WISE" />{{·}}10.6<ref name="jpldata" /><ref name="lcdb" /> {{val|11.08|0.29}}<ref name="Veres-2015" /> }}

'''1046 Edwin''', provisional designation {{mp|1924 UA}}, is a background asteroid from the outer regions of the asteroid belt, approximately {{convert|30|km|mi|abbr=off|sigfig=1|sp=us}} kilometers in diameter. It was discovered on 1 December 1924, by Belgian–American astronomer George Van Biesbroeck at the Yerkes Observatory in Wisconsin, United States, who named it after his son, Edwin Van Biesbroeck.<ref name="MPC-object" /> The potentially metallic asteroid has a short rotation period of 5.29 hours.<ref name="lcdb" />

== Orbit and classification ==

''Edwin'' is a non-family asteroid from the main belt's background population.<ref name="Ferret" /> It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.2 AU once every 5 years and 2 months (1,882 days; semi-major axis of 2.98 AU). Its orbit has an eccentricity of 0.06 and an inclination of 8° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with its first recorded observation at Heidelberg Observatory in March 1926, or 15 months after its official discovery observation at Yerkes Observatory.<ref name="MPC-object" />

== Physical characteristics ==

In the SMASS classification, ''Edwin'' is an Xe-subtype that transitions from the X-type to the very bright E-type asteroid<ref name="jpldata" /> It has also been characterized as a metallic M-type asteroid by the Wide-field Infrared Survey Explorer (WISE).<ref name="WISE" />

=== Rotation period ===

Since 2001, several rotational lightcurves of ''Edwin'' have been obtained from photometric observations by American William Koff at the Antelope Hills Observatory {{Obscode|H09}} in Colorado,<ref name="Koff-2002a" />{{efn|name=lightcurve-plot-Koff}} Richard Ditteon at the Oakley Observatory in Indiana,<ref name="Ditteon-2007" /> and French amateur astronomers Pierre Antonini, René Roy and Stéphane Charbonnel.<ref name="geneva-obs" />

Analysis of the best-rated lightcurve by Pierre Antonini from November 2006, gave a rotation period of 5.2906 hours with a brightness amplitude of 0.27 magnitude ({{small|U=3}}).<ref name="lcdb" /><ref name="geneva-obs" /> While not being a fast rotator, it has a relatively short spin-rate for an asteroid of its size.

=== Diameter and albedo ===

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, ''Edwin'' measures between 25.15 and 36.355 kilometers in diameter and its surface has an albedo between 0.1113 and 0.235.<ref name="AKARI" /><ref name="Masiero-2014" /><ref name="WISE" />

The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a larger diameter of 42.23 kilometers based on an absolute magnitude of 10.6.<ref name="lcdb" />

== Naming ==

This minor planet was named after Edwin Van Biesbroeck, son of discoverer George Van Biesbroeck. The official naming citation was mentioned in ''The Names of the Minor Planets'' by Paul Herget in 1955 ({{small|H 99}}).<ref name="springer" />

== Notes == {{notelist|refs=

{{efn|name=lightcurve-plot-Koff|1=[http://www.antelopehillsobservatory.org/lightcurves/1046.gif Lightcurve plot of (1046) Edwin] by Robert A. Koff at the Antelope Hills Observatory.<ref name="Koff-2002a" /> Rotation period {{val|5.29|0.01}} hours. Quality code of 2+.}}

}}

== References == {{reflist|30em|refs=

<ref name="jpldata">{{cite web |type = 2018-01-26 last obs. |title = JPL Small-Body Database Browser: 1046 Edwin (1924 UA) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001046 |publisher = Jet Propulsion Laboratory |accessdate = 20 March 2018}}</ref>

<ref name="springer">{{cite book |chapter = (1046) Edwin |title = Dictionary of Minor Planet Names |url = https://archive.org/details/dictionaryminorp00schm |url-access = limited |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = [https://archive.org/details/dictionaryminorp00schm/page/n102 89] |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1047}}</ref>

<ref name="MPC-object">{{cite web |title = 1046 Edwin (1924 UA) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1046 |accessdate = 20 March 2018}}</ref>

<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (1046) Edwin |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#001046 |accessdate = 20 March 2018}}</ref>

<ref name="Masiero-2014">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645}}</ref>

<ref name="Ferret">{{cite web |title = Asteroid 1046 Edwin – Nesvorny HCM Asteroid Families V3.0 |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1046+Edwin |accessdate = 24 October 2019}}</ref>

<ref name="lcdb">{{cite LCDB|number = 1046 |accessdate = 20 March 2018}}</ref>

<ref name="WISE">{{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}}</ref>

<ref name="AKARI">{{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |doi-access= free }} [http://vizier.cfa.harvard.edu/viz-bin/VizieR?-source=J/PASJ/63/1117 Online catalog]</ref>

<ref name="Koff-2002a">{{Cite journal |author = Koff, R. A. |date = June 2002 |title = Lightcurve Photometry of 492 Gismonda, 1046 Edwin, and 1310 Villigera |journal = The Minor Planet Bulletin |volume = 29 |pages = 25–26 |bibcode = 2002MPBu...29...25K}}</ref>

<ref name="Ditteon-2007">{{Cite journal |first1 = Richard |last1 = Ditteon |first2 = Scot |last2 = Hawkins |date = September 2007 |title = Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006 |journal = The Minor Planet Bulletin |volume = 34 |issue = 3 |pages = 59–64 |issn = 1052-8091 |bibcode = 2007MPBu...34...59D}}</ref>

<ref name="Veres-2015">{{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 |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762}}</ref>

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== External links == * [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|1046}} * {{JPL small body}}

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{{DEFAULTSORT:Edwin}} 001046 Category:Discoveries by George Van Biesbroeck Category:Named minor planets 001046 19241201