1731 Smuts
| Discovery [1] | |
|---|---|
| Discovered by | Ernest Johnson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 9 August 1948 |
| Designations | |
| 1731 Smuts | |
Named after | Jan Smuts (Field Marshal and PM) [2] |
| 1948 PH · 1926 TF 1931 QA · 1935 FS 1938 YB · 1941 KG 1947 LC · 1948 PP 1954 SX · 1960 WE 1966 UY | |
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.41 yr (32658 days) |
| Aphelion | 3.5693 AU (533.96 Gm) |
| Perihelion | 2.7650 AU (413.64 Gm) |
| 3.1671 AU (473.79 Gm) | |
| Eccentricity | 0.12697 |
| 5.64 yr (2058.7 d) | |
| 296.03° | |
| 0° 10m 29.496s / day | |
| Inclination | 5.9333° |
| 152.48° | |
| 203.89° | |
| Earth MOID | 1.75972 AU (263.250 Gm) |
| Jupiter MOID | 1.85873 AU (278.062 Gm) |
| TJupiter | 3.182 |
| Physical characteristics | |
| Dimensions | 54.07 km 54.71±0.98 km [4] 57.491±0.432 km [5] 53.87 km (derived) [3] |
Mean radius | 27.035 ± 0.55 km |
| 12.5 h (0.52 d) [1][6] | |
| 0.0604 ± 0.003 [1] 0.059±0.003 [4] 0.0534±0.0060 [5] 0.0421 (derived) [3] | |
| C [3] | |
| 10.5 | |
1731 Smuts, provisional designation 1948 PH, is a large, carbonaceous asteroid from the outer region of the asteroid belt, about 54 kilometers in diameter. It was discovered by South African astronomer Ernest Johnson at Union Observatory, Johannesburg, on 9 August 1948.[7]
The C-type asteroid orbits the Sun at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,058 days). Its orbit shows an eccentricity of 0.13 and is tilted by 6 degrees to the plane of the ecliptic. It has a rotation period of 12.5 hours[6] and an albedo of 0.05–0.06, according to observations carried out by the IRAS, Akari, and Wide-field Infrared Survey Explorer missions.[1][4][5]
The asteroid was named after prominent South African and British Commonwealth statesman, Field Marshal and philosopher, Jan Smuts (1870–1950), under whom the discoverer of the asteroid fought in both World Wars. Smuts captured German South-West Africa in World War I and was the only man to sign both of the peace treaties ending the First and Second World Wars. He served as prime minister of South Africa from 1919 until 1924 and again from 1939 until 1948.[2]
References
- ^ a b c d e "JPL Small-Body Database Browser: 1731 Smuts (1948 PH)" (2015-08-15 last obs.). Jet Propulsion Laboratory. Retrieved 21 April 2016.
- ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1731) Smuts. Springer Berlin Heidelberg. p. 137. ISBN 978-3-540-29925-7. Retrieved 20 November 2015.
- ^ a b c d "LCDB Data for (1731) Smuts". Asteroid Lightcurve Database (LCDB). Retrieved 20 November 2015.
- ^ a b c 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. Retrieved 20 November 2015.
- ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 20 November 2015.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1731) Smuts". Geneva Observatory. Retrieved 20 November 2015.
- ^ "1731 Smuts (1948 PH)". Minor Planet Center. Retrieved 20 November 2015.
External links
- 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 (1)-(5000) – Minor Planet Center
- 1731 Smuts at the JPL Small-Body Database
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