22740 Rayleigh
{{Short description|Outer main-belt asteroid}}
{{Use dmy dates|date=April 2018}}
{{Infobox planet
| minorplanet = yes
| name = 22740 Rayleigh
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = E. W. Elst
| discovery_site = La Silla Obs.
| discovered = 20 September 1998
| mpc_name = (22740) Rayleigh
| alt_names = {{nowrap|{{mp|1998 SX|146}}{{·}}1986 SN}}
| pronounced =
| named_after = Lord Rayleigh
{{small|(English physicist)}}
| mp_category = main-belt{{·}}{{small|(outer)}}
{{nowrap|background{{·}}Zhongguo}}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 31.32 yr (11,438 d)
| aphelion = 3.9380 AU
| perihelion = 2.5473 AU
| semimajor = 3.2426 AU
| eccentricity = 0.2144
| period = 5.84 yr (2,133 d)
| mean_anomaly = 200.81°
| mean_motion = {{Deg2DMS|0.1688|sup=ms}} / day
| inclination = 3.1157°
| asc_node = 169.06°
| arg_peri = 112.43°
| mean_diameter = {{val|9.819|2.434}} km
| rotation =
| albedo = {{val|0.088|0.081}}
| spectral_type =
}}
22740 Rayleigh (provisional designation {{mp|1998 SX|146}}) is a Zhongguo asteroid from the outermost region of the asteroid belt, approximately {{convert|10|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It was discovered on 20 September 1998, by Belgian astronomer Eric Elst at the La Silla Observatory in Chile. It is one of few asteroids located in the 2:1 resonance with Jupiter. The asteroid was named for English physicist and Nobel laureate Lord Rayleigh.
Orbit and classification
Rayleigh is a non-family asteroid from the main belt's background population. It is a member of the small group of Zhongguo asteroids, located in the Hecuba gap (2:1 mean motion resonance with Jupiter) near 3.27 AU. Contrary to the nearby unstable Griqua group, the orbits of the Zhongguos are stable over half a billion years.
It orbits the Sun in the outer asteroid belt at a distance of 2.5–3.9 AU once every 5 years and 10 months (2,133 days; semi-major axis of 3.24 AU). Its orbit has an eccentricity of 0.21 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with its observations as {{mp|1986 SN}} at Klet Observatory in September 1986, or 13 years prior to its official discovery observation at La Silla.
Physical characteristics
= Diameter and albedo =
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Rayleigh measures 9.819 kilometers in diameter and its surface has an albedo of 0.088.
= Rotation period =
As of 2018, no rotational lightcurve of Rayleigh has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.
Naming
This minor planet was named after English physicist John William Strutt, 3rd Baron Rayleigh (Lord Rayleigh; 1842–1919), who discovered the noble gas argon and was awarded the Nobel Prize in Physics in 1904 (also see list of laureates). The official naming citation was published by the Minor Planet Center on 1 June 2007 ({{small|M.P.C. 59923}}). The lunar crater Rayleigh as well as the crater Rayleigh on Mars are also named in his honor.{{GPN|4966|name=Lunar crater Rayleigh}}{{GPN|4967|name=Martian crater Rayleigh}}
References
{{reflist|30em|refs=
|type = 2018-01-23 last obs.
|title = JPL Small-Body Database Browser: 22740 Rayleigh (1998 SX146)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2022740
|publisher = Jet Propulsion Laboratory
|accessdate = 27 April 2018}}
|title = 22740 Rayleigh (1998 SX146)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=22740
|accessdate = 31 January 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 31 January 2018}}
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
|first4 = J. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = T. |last6 = Grav
|first7 = E. |last7 = Kramer
|first8 = S. |last8 = Sonnett
|first9 = R. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = December 2015
|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos
|journal = The Astrophysical Journal
|volume = 814
|issue = 2
|page = 13
|bibcode = 2015ApJ...814..117N
|doi = 10.1088/0004-637X/814/2/117
|arxiv = 1509.02522
|s2cid = 9341381 }}
|first1 = F. |last1 = Roig
|first2 = D. |last2 = Nesvorný
|first3 = S. |last3 = Ferraz-Mello
|date = September 2002
|title = Asteroids in the 2 : 1 resonance with Jupiter: dynamics and size distribution [ Erratum: 2002MNRAS.336.1391R ]
|journal = Monthly Notices of the Royal Astronomical Society
|volume = 335
|issue = 2
|pages = 417–431
|bibcode = 2002MNRAS.335..417R
|doi = 10.1046/j.1365-8711.2002.05635.x
|doi-access = free
}}
|title = Asteroid 22740 Rayleigh – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=22740
|access-date= 29 October 2019}}
|title = LCDB Data for (22740) Rayleigh
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=22740%7CRayleigh
|accessdate = 27 April 2018}}
}}
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/NumberedMPs020001.html Discovery Circumstances: Numbered Minor Planets (20001)-(25000)] – Minor Planet Center
- {{AstDys|22740}}
- {{JPL small body}}
{{Minor planets navigator |22739 Sikhote-Alin |number=22740 | }}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Rayleigh}}