1175 Margo
{{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
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| discovered = 17 October 1930
| mpc_name = (1175) Margo
| alt_names = 1930 UD{{·}}1953 VK
1957 KU{{·}}A907 VA
| pronounced =
| mp_category = main-belt{{·}}{{small|(outer)}}
background
| 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
{{val|24.266|0.276}} km
{{val|25.394|0.250}} km
58.29 km {{small|(calculated)}}
| rotation = {{val|6.01|0.02}} h
{{val|6.01|0.03}} h
{{val|6.0136|0.0002}} h
{{val|6.01375|0.00005}} h
{{val|6.015|0.001}} h
{{val|6.017|0.001}} h
{{val|11.99|0.03}} h
| albedo = 0.057 {{small|(assumed)}}
{{val|0.2409|0.0329}}
{{val|0.249|0.042}}
{{val|0.302|0.026}}
| spectral_type = S{{·}}C {{small|(assumed)}}
| abs_magnitude = 9.9{{·}}10.0{{·}}{{val|10.06|0.23}}{{·}}10.20
}}
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. The meaning of the asteroids's name is unknown.
Orbit and classification
Margo is a non-family asteroid from the main belt's background population. 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.
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.
Physical characteristics
Margo has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey. Conversely, the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceous C-type.
= 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}}). Since then, several other, lower-rated lightcurves have been published ({{small|U=3-/2+/2+/2/2}}).
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°).
= 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. 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.
Naming
This minor planet was named by the discoverer Karl Reinmuth. Any reference of its name to a person or occurrence is unknown.
= 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.
References
{{reflist|30em|refs=
|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
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|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 }}
|title = Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision
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|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}}
|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}}
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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|1175}}
- {{JPL small body}}
{{Minor planets navigator |1174 Marmara |number=1175 |1176 Lucidor}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Margo}}