{{Short description|Main-belt asteroid}} {{Use dmy dates|date=October 2019}} {{Infobox planet | minorplanet = yes | name = 1486 Marilyn | background = #D6D6D6 | image = 001486-asteroid shape model (1486) Marilyn.png | image_scale = | caption = Shape of ''Marilyn'' modelled from its lightcurve | discovery_ref = <ref name="jpldata" /> | discoverer = E. Delporte | discovery_site = Uccle Obs. | discovered = 23 August 1938 | mpc_name = (1486) Marilyn | alt_names = 1938 QA | pronounced = | named_after = Marilyn Herget<ref name="springer" /><br />{{small|(daughter of astronomer)}}<br />Paul Herget | mp_category = main-belt{{·}}{{small|(inner)}}<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 = 79.11 yr (28,894 days) | aphelion = 2.4725 AU | perihelion = 1.9245 AU | semimajor = 2.1985 AU | eccentricity = 0.1246 | period = 3.26 yr (1,191 days) | mean_anomaly = 93.483° | mean_motion = {{Deg2DMS|0.3024|sup=ms}} / day | inclination = 0.0751° | asc_node = 333.23° | arg_peri = 350.11° | dimensions = {{val|6.13|0.42}} km<ref name="Masiero-2012" /><br />{{val|6.414|0.086}} km<ref name="Masiero-2014" /><br />{{val|6.925|0.051}} km<ref name="WISE" /><br />8.18 km {{small|(calculated)}}<ref name="lcdb" /> | rotation = {{val|2.2837|0.0001}} h {{small|(dated)}}<ref name="geneva-obs" /><br />{{val|4.566|0.004}} h<ref name="Benishek-2014a" /><br />{{val|4.566945|0.000001}} h<ref name="Durech-2016" /><br />{{val|4.56695|0.00005}} h<ref name="Hanus-2016a" /><br />{{val|4.568|0.001}} h<ref name="Ferrero-2014a" /> | albedo = 0.20 {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.3118|0.0507}}<ref name="WISE" /><br />{{val|0.391|0.041}}<ref name="Masiero-2012" /> | spectral_type = S {{small|(assumed)}}<ref name="lcdb" /> | abs_magnitude = 12.70<ref name="Masiero-2012" /><ref name="WISE" />{{·}}12.8<ref name="jpldata" /><ref name="lcdb" />{{·}}{{val|12.93|0.25}}<ref name="Veres-2015" /> }}
'''1486 Marilyn''', provisional designation {{mp|1938 QA}}, is a stony background asteroid from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 23 August 1938, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle.<ref name="MPC-object" /> The asteroid was named after Marilyn Herget, daughter of astronomer Paul Herget.<ref name="springer" />
== Orbit and classification ==
''Marilyn'' is a non-family asteroid from the main belt's background population.<ref name="AstDys-object" /> It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,191 days). Its orbit has an eccentricity of 0.12 and an inclination of 0° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with its official discovery observation at Uccle. No precoveries were taken.<ref name="MPC-object" />
== Physical characteristics ==
''Marilyn'' is an assumed stony S-type asteroid.<ref name="lcdb" />
=== Rotation period ===
In August and September 2013, two rotational lightcurves of ''Marilyn'' were obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 4.566 and 4.568 hours with a brightness variation of 0.48 and 0.42 magnitude, respectively ({{small|U=3/3}}).<ref name="Benishek-2014a" /><ref name="Ferrero-2014a" /> The results supersede a period of 2.2837 hours (half the previous period solution) from a fragmentary lightcurve obtained by Maurice Audejean in March 2012 ({{small|U=1+}}).<ref name="geneva-obs" />
=== Spin axis ===
The studies have also modeled the asteroid's lightcurve, using photometric data from the Lowell Photometric Database (LPD) and other sources. Modelling gave a concurring period of 4.566945 and 4.56695 hours, respectively.<ref name="Durech-2016" /><ref name="Hanus-2016a" /> Each of the two studies also gave two spin axis in ecliptic coordinates (λ, β): (83.0°, −57°) and (270.0°, –62.0°),<ref name="Durech-2016" /> as well as (88.0°, −88°) and (267.0°, −66°).<ref name="Hanus-2016a" />
=== Diameter and albedo ===
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Marilyn'' measures between 6.13 and 6.925 kilometers in diameter and its surface has an albedo between 0.3118 and 0.391.<ref name="Masiero-2012" /><ref name="Masiero-2014" /><ref name="WISE" />
The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on an absolute magnitude of 12.8.<ref name="lcdb" />
== Naming ==
This minor planet was named after Marilyn Herget, daughter of American astronomer Paul Herget, who computed the body's orbit ({{small|H 133}}).<ref name="springer" /> Herget is also the author of ''The Names of the Minor Planets'' first released in the 1950s.<ref name="springer" /> The asteroid 1751 Herget was named after him.<ref name="springer" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2017-10-01 last obs. |title = JPL Small-Body Database Browser: 1486 Marilyn (1938 QA) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001486 |archive-url = https://web.archive.org/web/20200820053345/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001486 |url-status = dead |archive-date = 20 August 2020 |publisher = Jet Propulsion Laboratory |accessdate = 19 October 2017}}</ref>
<ref name="springer">{{cite book |title = Dictionary of Minor Planet Names – (1486) Marilyn |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |pages = 118–119 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1487 |chapter = (1486) Marilyn }}</ref>
<ref name="MPC-object">{{cite web |title = 1486 Marilyn (1938 QA) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1486 |accessdate = 19 October 2017}}</ref>
<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (1486) Marilyn |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001486 |accessdate = 19 October 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= 19 October 2017}}</ref>
<ref name="AstDys-object">{{cite web |title = Asteroid 1486 Marilyn – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1486 |access-date= 29 October 2019}}</ref>
<ref name="lcdb">{{cite LCDB|number = 1486 |accessdate = 19 October 2017}}</ref>
<ref name="Masiero-2012">{{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 = C. |last6 = Nugent |first7 = M. S. |last7 = Cabrera |date = November 2012 |title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M |journal = The Astrophysical Journal Letters |volume = 759 |issue = 1 |page = 5 |bibcode = 2012ApJ...759L...8M |doi = 10.1088/2041-8205/759/1/L8 |arxiv = 1209.5794 |access-date= 19 October 2017}}</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="Benishek-2014a">{{Cite journal |author = Benishek, Vladimir |date = April 2014 |title = Rotation Period Determination for 1425 Tuorla, 1468 Zomba, 1486 Marilyn, 2112 Ulyanov, and (101158) 2000 OL |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..126B |journal = The Minor Planet Bulletin |volume = 41 |issue = 2 |pages = 126–127 |issn = 1052-8091 |bibcode = 2014MPBu...41..126B |access-date= 19 October 2017}}</ref>
<ref name="Ferrero-2014a">{{Cite journal |author = Ferrero, Andrea |date = January 2014 |title = Period Determination of Four Main-belt Asteroids in Mid-2013 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41...24F |journal = The Minor Planet Bulletin |volume = 41 |issue = 1 |pages = 24–25 |issn = 1052-8091 |bibcode = 2014MPBu...41...24F |access-date= 19 October 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|1486}} * {{JPL small body}}
{{Minor planets navigator |1485 Isa |number=1486 |1487 Boda}} {{Small Solar System bodies}} {{Authority control}}
{{DEFAULTSORT:Marilyn}} 001486 Category:Discoveries by Eugène Joseph Delporte Category:Named minor planets 19380823