5771 Somerville, provisional designation 1987 ST1, is a carbonaceous Lixiaohua asteroid from the outer regions of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 21 September 1987, by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory in Flagstaff, Arizona.[11] The asteroid was named for Scottish polymath Mary Somerville.[2]
| Discovery [1] | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 21 September 1987 |
| Designations | |
| (5771) Somerville | |
Named after | Mary Somerville [2] (Scottish polymath) |
| 1987 ST1 · 1982 YY1 1989 BG1 | |
| main-belt · (outer) [3] Lixiaohua [4] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.36 yr (12,549 days) |
| Aphelion | 3.8347 AU |
| Perihelion | 2.4381 AU |
| 3.1364 AU | |
| Eccentricity | 0.2226 |
| 5.55 yr (2,029 days) | |
| 135.29° | |
| 0° 10m 38.64s / day | |
| Inclination | 8.2191° |
| 288.45° | |
| 101.58° | |
| Physical characteristics | |
| Dimensions | 22.84 km (derived)[3] 24.90±6.97 km[5] 26.43±5.87 km[6] 28.306±0.264 km[7] 33.60±2.18 km[8] |
| 9.20±0.05 h[9][a] | |
| 0.017±0.002[8] 0.029±0.001[7] 0.03±0.03[6] 0.04±0.08[5] 0.0407 (derived)[3] | |
| C [3] | |
| 12.20[7] · 12.30[1][3][6] · 12.40[8] · 12.50[5] · 12.94±0.26[10] | |
Orbit and classification
editSomerville is a member of the Lixiaohua family,[4] an outer-belt asteroid family with more than 700 known members, consisting of C-type and X-type asteroids. The family's namesake is 3556 Lixiaohua.[12]: 23
The asteroid orbits the Sun in the outer main-belt at a distance of 2.4–3.8 AU once every 5 years and 7 months (2,029 days). Its orbit has an eccentricity of 0.22 and an inclination of 8° with respect to the ecliptic.[1] Somerville was first identified as 1982 YY1 at Purple Mountain Observatory in December 1982. The body's observation arc begins with its official discovery observation at Flagstaff.[11]
Physical characteristics
editSomerville is an assumed C-type asteroid.[3]
Rotation period
editIn March 2012, a rotational lightcurve of Somerville was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. Lightcurve analysis gave a rotation period of 9.20 hours with a brightness amplitude of 0.80 magnitude (U=2+).[9][a]
Diameter and albedo
editAccording to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Somerville measures between 24.90 and 33.60 kilometers in diameter and its surface has an albedo between 0.017 and 0.04.[5][6][7][8]
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0407 and a diameter of 22.84 kilometers based on an absolute magnitude of 12.3.[3]
Naming
editThis minor planet was named after Mary Somerville (1780–1872; née Fairfax), a Scottish polymath and science writer who studied mathematics and astronomy. She is considered to be one of Europe's most distinguished women scientists of her time.[2] The official naming citation was published by the Minor Planet Center on 12 July (M.P.C. 25444).[13]
Notes
edit- ^ a b Lightcurve plot of (5771) Somerville, Palmer Divide Observatory, Brian D. Warner (2012), with a period of 9.20±0.05 hours and an amplitude (mag) of 0.80±0.03.
References
edit- ^ a b c d "JPL Small-Body Database Browser: 5771 Somerville (1987 ST1)" (2017-04-28 last obs.). Jet Propulsion Laboratory. Retrieved 9 September 2017.
- ^ a b c Schmadel, Lutz D. (2007). "(5771) Somerville". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 488. doi:10.1007/978-3-540-29925-7_5435. ISBN 978-3-540-00238-3.
- ^ a b c d e f g "LCDB Data for (5771) Somerville". Asteroid Lightcurve Database (LCDB). Retrieved 9 September 2017.
- ^ a b "Asteroid 5771 Somerville – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
- ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
- ^ a b c d 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 9 September 2017.
- ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 9 September 2017.
- ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
- ^ a b Warner, Brian D. (July 2012). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2011 December – 2012 March". The Minor Planet Bulletin. 39 (3): 158–167. Bibcode:2012MPBu...39..158W. ISSN 1052-8091. Retrieved 9 September 2017.
- ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 9 September 2017.
- ^ a b "5771 Somerville (1987 ST1)". Minor Planet Center. Retrieved 9 September 2017.
- ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 September 2017.
External links
edit- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5771 Somerville at AstDyS-2, Asteroids—Dynamic Site
- 5771 Somerville at the JPL Small-Body Database
