22740 Rayleigh

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22740 Rayleigh
Discovery [1]
Discovered by E. W. Elst
Discovery site La Silla Obs.
Discovery date 20 September 1998
MPC designation (22740) Rayleigh
Named after
Lord Rayleigh[2]
(English physicist)
1998 SX146 · 1986 SN
main-belt · (outer)[1]
background [3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 30.47 yr (11,129 d)
Aphelion 3.9380 AU
Perihelion 2.5486 AU
3.2433 AU
Eccentricity 0.2142
5.84 yr (2,133 days)
0° 10m 7.32s / day
Inclination 3.1157°
Physical characteristics
Dimensions 9.819±2.434 km[4]

22740 Rayleigh, provisional designation 1998 SX146, is a background asteroid from the outermost regions of the asteroid belt, approximately 10 kilometers 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.[2]

Orbit and classification[edit]

Rayleigh is a non-family asteroid from the main belt's background population.[3] It is one of few asteroids located in the Hecuba gap (2 : 1 mean motion resonance with Jupiter) near 3.27 AU.[5]

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.[1] 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.[2]

Physical characteristics[edit]

Diameter and albedo[edit]

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.[4]

Rotation period[edit]

As of 2018, no rotational lightcurve of Rayleigh has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[1][6]


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).[2] The official naming citation was published by the Minor Planet Center on 1 June 2007 (M.P.C. 59923).[7] The lunar crater Rayleigh as well as the crater Rayleigh on Mars are also named in his honor.[8][9]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 22740 Rayleigh (1998 SX146)" (2017-03-20 last obs.). Jet Propulsion Laboratory. Retrieved 31 January 2018. 
  2. ^ a b c d "22740 Rayleigh (1998 SX146)". Minor Planet Center. Retrieved 31 January 2018. 
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 31 January 2018. 
  4. ^ a b c 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:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 31 January 2018. 
  5. ^ 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. 
  6. ^ "LCDB Data for (22740) Rayleigh". Asteroid Lightcurve Database (LCDB). Retrieved 31 January 2018. 
  7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 January 2018. 
  8. ^ "Lunar crater Rayleigh". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
  9. ^ "Martian crater Rayleigh". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

External links[edit]