|Discovered by||E. W. Elst|
|Discovery site||La Silla Obs.|
|Discovery date||20 September 1998|
|MPC designation||(22740) Rayleigh|
|Lord Rayleigh |
|1998 SX146 · 1986 SN|
|main-belt  · (outer)|
background  · Zhongguo 
|Orbital characteristics |
|Epoch 23 March 2018 (JD 2458200.5)|
|Uncertainty parameter 0|
|Observation arc||31.32 yr (11,438 d)|
|5.84 yr (2,133 d)|
|0° 10m 7.68s / day|
|±2.434 km 9.819|
22740 Rayleigh, provisional designation 1998 SX146, is a Zhongguo asteroid from the outermost region of the asteroid belt, approximately 10 kilometers (6 miles) 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 1986 SN at Klet Observatory in September 1986, or 13 years prior to its official discovery observation at La Silla.
Diameter and albedo
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 (M.P.C. 59923). The lunar crater Rayleigh as well as the crater Rayleigh on Mars are also named in his honor.
- "JPL Small-Body Database Browser: 22740 Rayleigh (1998 SX146)" (2018-01-23 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2018.
- "22740 Rayleigh (1998 SX146)". Minor Planet Center. Retrieved 31 January 2018.
- "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 31 January 2018.
- Roig, F.; Nesvorný, D.; Ferraz-Mello, S. (September 2002). "Asteroids in the 2 : 1 resonance with Jupiter: dynamics and size distribution [ Erratum: 2002MNRAS.336.1391R ]". Monthly Notices of the Royal Astronomical Society. 335 (2): 417–431. Bibcode:2002MNRAS.335..417R. doi:10.1046/j.1365-8711.2002.05635.x. Retrieved 31 March 2017.
- Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 31 January 2018.
- "LCDB Data for (22740) Rayleigh". Asteroid Lightcurve Database (LCDB). Retrieved 27 April 2018.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 January 2018.
- "Lunar crater Rayleigh". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
- "Martian crater Rayleigh". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
- 22740 Rayleigh at AstDyS-2, Asteroids—Dynamic Site
- 22740 Rayleigh at the JPL Small-Body Database