{{Short description|Main-belt asteroid}} {{Use dmy dates|date=July 2018}} {{Infobox planet | minorplanet = yes | name = 7387 Malbil | background = #D6D6D6 | image = 007387-asteroid shape model (7387) Malbil.png | image_scale = | caption = Shape model of ''Malbil'' from its lightcurve | discovery_ref = <ref name="MPC-object" /> | discovered = 30 January 1982 | discoverer = E. Bowell | discovery_site = Anderson Mesa Stn. | mpc_name = (7387) Malbil | alt_names = {{mp|1982 BS|1}} | pronounced = | named_after = Malcolm Bilson<br />{{small|(American pianist)}}<ref name="springer" /> | mp_category = {{plainlist| * main-belt<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|(inner)}} * background<ref name="AstDys-object" /><ref name="Ferret" /><ref name="Zappala-family" /> }} | orbit_ref = <ref name="jpldata" /> | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 35.44 yr (12,946 days) | aphelion = 2.8283 AU | perihelion = 2.0728 AU | semimajor = 2.4506 AU | eccentricity = 0.1542 | period = 3.84 yr (1,401 days) | mean_anomaly = 139.08° | mean_motion = {{Deg2DMS|0.2569|sup=ms}} / day | inclination = 7.0546° | asc_node = 151.07° | arg_peri = 295.00° | mean_diameter = {{val|6.3|ul=km}} {{small|(est. at 0.20)}}<ref name="h" /> | rotation = {{val|7.5498|ul=h}}<ref name="Hanus-2016a" /> | pole_ecliptic_lat= {{plainlist| * (253°, −74°) (λ<sub>1</sub>/β<sub>1</sub>)<ref name="Hanus-2016a" /> * {{nowrap|(127.0°, −69.0°) (λ<sub>2</sub>/β<sub>2</sub>)<ref name="Hanus-2016a" />}} }} | albedo = | spectral_type = | abs_magnitude = 13.4<ref name="jpldata" /> }}

'''7387 Malbil''' (''prov. designation'': {{mp|1982 BS|1}}) is an elongated background asteroid from the inner regions of the asteroid belt. It was discovered on 30 January 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States.<ref name="MPC-object" /> The asteroid has a rotation period of 7.5 hours and measures approximately {{convert|6|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It is named for American pianist Malcolm Bilson.<ref name="springer" />

== Classification and orbit ==

''Malbil'' is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.<ref name="AstDys-object" /><ref name="Ferret" /> It orbits the Sun in the inner main-belt at a distance of 2.1–2.8&nbsp;AU once every 3 years and 10 months (1,401 days). Its orbit has an eccentricity of 0.15 and an inclination of 7° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with its first used observation at the discovering observatory in 1986, or 4 years after its official discovery observation.<ref name="MPC-object" />

== Naming ==

This minor planet was named after American fortepianist and musicologist Malcolm Bilson (born 1935), who gave a recital at the "Asteroids, Comets, Meteors" conference at Cornell University in New York.<ref name="springer" /> The approved naming citation was published by the Minor Planet Center on 28 July 1999 ({{small|M.P.C. 35485}}).<ref name="MPC-Circulars-Archive" />

== Physical characteristics ==

As of 2020, ''Malbil''{{'}}s effective size, its composition and albedo remain unknown.<ref name="jpldata" /><ref name="lcdb" /> Data from photometric observation gave a modeled sidereal rotation period of 7.5498 hours and two spin axes at (253°, −74°) and (127.0°, −69.0°) in ecliptic coordinates (λ, β). The modeling suggests that the asteroid is rather elongated in shape.<ref name="Hanus-2016a" />

Based on a magnitude-to-diameter conversion, its generic diameter is between 5 and 12 kilometer for an absolute magnitude of 13.4, and an assumed albedo in the range of 0.05 to 0.25.<ref name="h" /> Since asteroids in the inner main-belt are typically of stony rather than carbonaceous composition, with albedos of 0.20 or higher, ''Malbil''{{'}}s diameter can be estimate to measure around 6.3 kilometers, as the higher its albedo (reflectivity), the lower the body's diameter at a constant absolute magnitude (brightness).<ref name="h" />

== References == <references>

<ref name="jpldata">{{cite web |type = 2017-07-05 last obs. |title = JPL Small-Body Database Browser: 7387 Malbil (1982 BS1) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007387 |publisher = Jet Propulsion Laboratory |access-date = 5 September 2017}}</ref>

<ref name="springer">{{cite book |title = Dictionary of Minor Planet Names |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |chapter = (7387) Malbil |page = 594 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_6462}}</ref>

<ref name="MPC-object">{{cite web |title = 7387 Malbil (1982 BS1) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=7387 |access-date = 12 March 2017}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |access-date = 12 March 2017}}</ref>

<ref name="h">{{cite web |title = Asteroid Size Estimator |publisher = CNEOS/JPL |url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html |access-date= 5 September 2017}}</ref>

<ref name="lcdb">{{cite LCDB|number = 7387 |access-date = 12 March 2017}}</ref>

<ref name="Ferret">{{cite web |title = Asteroid 7387 Malbil |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=7387+Malbil |access-date = 23 March 2020}}</ref>

<ref name="AstDys-object">{{cite web |title = Asteroid 7387 Malbil – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=7387 |access-date= 23 March 2020}}</ref>

<ref name="Zappala-family">{{cite journal |last1 = Zappalà |first1 = V. |last2 = Bendjoya |first2 = Ph. |last3 = Cellino |first3 = A. |last4 = Farinella |first4 = P. |last5 = Froeschle |first5 = C. |date = 1997 |title = Asteroid Dynamical Families |url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_5_DDR_FAMILY_V4_1/data/family.tab |journal = NASA Planetary Data System |pages = EAR-A-5-DDR-FAMILY-V4.1 |access-date = 15 March 2020}} ([https://sbn.psi.edu/pds/resource/family.html PDS main page])</ref>

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</references> <!-- end of reflist -->

== External links == * [http://www.minorplanet.info/PHP/OneAsteroidInfo.php Lightcurve Database Query] (LCDB), at ''www.minorplanet.info'' * [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] – ''Geneva Observatory'', Raoul Behrend * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center * {{AstDys|7388}} * {{JPL small body}} {{Minor planets navigator |7386 Paulpellas|number=7387 |7388 Marcomorelli}} {{Small Solar System bodies}} {{Authority control}}

{{DEFAULTSORT:Malbil}} 007387 Category:Discoveries by Edward L. G. Bowell Category:Named minor planets 19820130