{{Short description|Stony background asteroid}} {{Use dmy dates|date=October 2019}} {{Infobox planet | minorplanet = yes | name = 1175 Margo | background = #D6D6D6 | image = 001175-asteroid shape model (1175) Margo.png | image_scale = | caption = Modelled shape of ''Margo'' from its lightcurve | discovery_ref = <ref name="jpldata" /> | discoverer = K. Reinmuth | discovery_site = Heidelberg Obs. | discovered = 17 October 1930 | mpc_name = (1175) Margo | alt_names = 1930 UD{{·}}1953 VK<br />1957 KU{{·}}A907 VA | pronounced = | named_after = unknown<ref name="springer" /> | mp_category = main-belt{{·}}{{small|(outer)}}<ref name="jpldata" /><ref name="lcdb" /><br />background<ref name="AstDys-object" /> | orbit_ref = <ref name="jpldata" /> | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 109.91 yr (40,146 days) | aphelion = 3.4345 AU | perihelion = 2.9979 AU | semimajor = 3.2162 AU | eccentricity = 0.0679 | period = 5.77 yr (2,107 days) | mean_anomaly = 61.257° | mean_motion = {{Deg2DMS|0.1709|sup=ms}} / day | inclination = 16.307° | asc_node = 237.19° | arg_peri = 102.79° | dimensions = {{val|22.99|0.85}} km<ref name="AKARI" /><br />{{val|24.266|0.276}} km<ref name="Masiero-2014" /><br />{{val|25.394|0.250}} km<ref name="WISE" /><br />58.29 km {{small|(calculated)}}<ref name="lcdb" /> | rotation = {{val|6.01|0.02}} h<ref name="Montgomery-2013" /><br />{{val|6.01|0.03}} h<ref name="geneva-obs" /><br />{{val|6.0136|0.0002}} h<ref name="geneva-obs" /><br />{{val|6.01375|0.00005}} h<ref name="Hanus-2016a" /><br />{{val|6.015|0.001}} h<ref name="Brinsfield-2010a" /><br />{{val|6.017|0.001}} h<ref name="Klinglesmith-2014d" /><br />{{val|11.99|0.03}} h<ref name="Oliver-2008" /> | albedo = 0.057 {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.2409|0.0329}}<ref name="WISE" /><br />{{val|0.249|0.042}}<ref name="Masiero-2014" /><br />{{val|0.302|0.026}}<ref name="AKARI" /> | spectral_type = S<ref name="Veres-2015" />{{·}}C {{small|(assumed)}}<ref name="lcdb" /> | abs_magnitude = 9.9<ref name="lcdb" />{{·}}10.0<ref name="jpldata" />{{·}}{{val|10.06|0.23}}<ref name="Veres-2015" />{{·}}10.20<ref name="AKARI" /><ref name="WISE" /> }}
'''1175 Margo''', provisional designation {{mp|1930 UD}}, is a stony background asteroid from the outermost regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 17 October 1930, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.<ref name="MPC-object" /> The meaning of the asteroids's name is unknown.<ref name="springer" />
== Orbit and classification ==
''Margo'' is a non-family asteroid from the main belt's background population.<ref name="AstDys-object" /> It orbits the Sun in the outermost asteroid belt at a distance of 3.0–3.4 AU once every 5 years and 9 months (2,107 days; semi-major axis of 3.22 AU). Its orbit has an eccentricity of 0.07 and an inclination of 16° with respect to the ecliptic.<ref name="jpldata" />
The body's observation arc begins with its first identification as {{mp|A907 VA}} at Heidelberg in November 1907, almost 23 years prior to its official discovery observation.<ref name="MPC-object" />
== Physical characteristics ==
''Margo'' has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey.<ref name="Veres-2015" /> Conversely, the ''Collaborative Asteroid Lightcurve Link'' (CALL) assumes it to be a carbonaceous C-type.<ref name="lcdb" />
=== Rotation period and poles ===
In November 2005, a rotational lightcurve of ''Margo'' was obtained from photometric observations by astronomers Raymond Poncy ({{small|177}}), Gino Farroni, Pierre Antonini, Donn Starkey ({{small|H63}}) and Raoul Behrend. Lightcurve analysis gave a well-defined rotation period of 6.0136 hours with a brightness amplitude of 0.31 magnitude ({{small|U=3}}).<ref name="geneva-obs" /> Since then, several other, lower-rated lightcurves have been published ({{small|U=3-/2+/2+/2/2}}).<ref name="Montgomery-2013" /><ref name="geneva-obs" /><ref name="Brinsfield-2010a" /><ref name="Klinglesmith-2014d" /><ref name="Oliver-2008" />
In 2016, the asteroid lightcurve has also been modeled using photometric data from various sources. It gave a concurring period of 6.01375 hours and two spin axis in ecliptic coordinates of (184.0°, −43.0°) and (353.0°, −17.0°).<ref name="Hanus-2016a" />
=== Diameter and albedo ===
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Margo'' measures between 22.99 and 25.394 kilometers in diameter and its surface has an albedo between 0.2409 and 0.302.<ref name="AKARI" /><ref name="Masiero-2014" /><ref name="WISE" /> CALL assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a much larger diameter of 58.29 kilometers based on an absolute magnitude of 9.9.<ref name="lcdb" />
== Naming ==
This minor planet was named by the discoverer Karl Reinmuth. Any reference of its name to a person or occurrence is unknown.<ref name="springer" />
=== Unknown meaning ===
Among the many thousands of named minor planets, ''Margo'' is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between {{mp|{{MoMP|164|164 Eva}}}} and {{mp|{{MoMP|1514|1514 Ricouxa}}}} and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.<ref name="DOMPN-unknown" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2017-11-02 last obs. |title = JPL Small-Body Database Browser: 1175 Margo (1930 UD) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001175 |publisher = Jet Propulsion Laboratory |access-date = 15 November 2017}}</ref>
<ref name="springer">{{cite book |title = Dictionary of Minor Planet Names – (1175) Margo |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 99 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1176 |chapter = (1175) Margo }}</ref>
<ref name="DOMPN-unknown">{{cite book |title = Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision |chapter = Appendix 11 – Minor Planet Names with Unknown Meaning |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |pages = 927–929 |date = 2007 |isbn = 978-3-540-00238-3 |author-link= Lutz D. Schmadel}}</ref>
<ref name="MPC-object">{{cite web |title = 1175 Margo (1930 UD) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1175 |access-date = 15 November 2017}}</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 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M |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 |access-date= 15 November 2017}}</ref>
<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (1175) Margo |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#001175 |access-date = 14 November 2017}}</ref>
<ref name="AstDys-object">{{cite web |title = Asteroid 1175 Margo – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1175 |access-date= 28 October 2019}}</ref>
<ref name="lcdb">{{cite LCDB|number = 1175 |access-date = 15 November 2017}}</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= }} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=1175 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])</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="Oliver-2008">{{Cite journal |first1 = Robert Lemke |last1 = Oliver |first2 = Heath |last2 = Shipley |first3 = Richard |last3 = Ditteon |date = October 2008 |title = Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2008 March |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..149O |journal = The Minor Planet Bulletin |volume = 35 |issue = 4 |pages = 149–150 |issn = 1052-8091 |bibcode = 2008MPBu...35..149O |access-date= 15 November 2017}}</ref>
<ref name="Brinsfield-2010a">{{Cite journal |author = Brinsfield, James W. |date = January 2010 |title = Asteroid Lightcurve Analysis at the Via Capote Observatory: 2009 3rd Quarter |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...19B |journal = The Minor Planet Bulletin |volume = 37 |issue = 1 |pages = 19–20 |issn = 1052-8091 |bibcode = 2010MPBu...37...19B |access-date= 15 November 2017}}</ref>
<ref name="Montgomery-2013">{{Cite journal |first1 = Kent A. |last1 = Montgomery |first2 = Cheri |last2 = Davis |first3 = Thomas |last3 = Renshaw |first4 = Jacob |last4 = Rolen |date = October 2013 |title = Photometric Study of Four Asteroids at Texas A&M Commerce Observatory |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..212M |journal = The Minor Planet Bulletin |volume = 40 |issue = 4 |pages = 212–213 |issn = 1052-8091 |bibcode = 2013MPBu...40..212M |access-date= 15 November 2017}}</ref>
<ref name="Klinglesmith-2014d">{{Cite journal |first1 = Daniel A. III |last1 = Klinglesmith |first2 = Jesse |last2 = Hanowell |first3 = Curtis Alan |last3 = Warren |date = October 2014 |title = Lightcurves for Inversion Model Candidates |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..206K |journal = The Minor Planet Bulletin |volume = 41 |issue = 4 |pages = 206–208 |issn = 1052-8091 |bibcode = 2014MPBu...41..206K |access-date= 15 November 2017}}</ref>
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}} <!-- end of reflist -->
== 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|1175}} * {{JPL small body}}
{{Minor planets navigator |1174 Marmara |number=1175 |1176 Lucidor}} {{Small Solar System bodies}} {{Authority control}}
{{DEFAULTSORT:Margo}} 001175 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19301017