astro.wikisort.org - AsteroidSiwa (minor planet designation: 140 Siwa) is a large and dark main-belt asteroid that was discovered by Austrian astronomer Johann Palisa on October 13, 1874, and named after Šiwa, the Slavic goddess of fertility.
Main-belt asteroid
140 Siwa|
Discovered by | J. Palisa |
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Discovery site | Austrian Naval Obs. |
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Discovery date | 13 October 1874 |
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MPC designation | (140) Siwa |
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Pronunciation | [citation needed] |
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Alternative designations | A874 TB; 1948 AL |
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Minor planet category | Main belt |
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Epoch 31 July 2016 (JD 2457600.5) |
Uncertainty parameter 0 |
Observation arc | 139.10 yr (50805 d) |
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Aphelion | 3.3224 AU (497.02 Gm) |
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Perihelion | 2.14323 AU (320.623 Gm) |
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Semi-major axis | 2.73283 AU (408.826 Gm) |
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Eccentricity | 0.21575 |
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Orbital period (sidereal) | 4.52 yr (1650.1 d) |
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Average orbital speed | 17.80 km/s |
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Mean anomaly | 200.674° |
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Mean motion | 0° 13m 5.398s / day |
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Inclination | 3.1860° |
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Longitude of ascending node | 107.263° |
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Argument of perihelion | 196.711° |
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Dimensions | 109.79±3.0 km |
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Mass | 1.4×1018 kg |
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Synodic rotation period | 34.445 h (1.4352 d)[1] 34.407 h[2] |
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Geometric albedo | 0.0676±0.004 |
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Spectral type | C-type asteroid[3] |
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Absolute magnitude (H) | 8.34 |
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The Rosetta comet probe was to visit Siwa on its way to comet 46P/Wirtanen in July, 2008. However, the mission was rerouted to comet 67P/Churyumov-Gerasimenko and the flyby had to be abandoned.[4]
Attempts to measure the rotation period of this asteroid have produced inconsistent results ranging from 14.7 to 32 hours. Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave an irregular light curve with a period of 34.407 ± 0.002 hours and a brightness variation of 0.05 ± 0.01 in magnitude.[2]
A 2004 study of the spectrum matched a typical C-type asteroid with typical carbonaceous chondrite makeup. There are no absorption features of mafic minerals found.[3] The classification was later revised to a P-type asteroid.[5]
References
- Yeomans, Donald K., "140 Siwa", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, archived from the original on 30 January 2016, retrieved 12 May 2016.
- Pilcher, Frederick (April 2011), "Rotation Period Determinations for 25 Phocaea, 140 Siwa, 149 Medusa 186 Celuta, 475 Ocllo, 574 Reginhild, and 603 Timandra", The Minor Planet Bulletin, vol. 38, no. 2, pp. 76–78, Bibcode:2011MPBu...38...76P.
- Birlan, Mirel; et al. (April 2004), "Near-IR spectroscopy of asteroids 21 Lutetia, 89 Julia, 140 Siwa, 2181 Fogelin and 5480 (1989YK8), potential targets for the Rosetta mission; remote observations campaign on IRTF", New Astronomy, vol. 9, no. 5, pp. 343–351, arXiv:astro-ph/0312638, Bibcode:2004NewA....9..343B, doi:10.1016/j.newast.2003.12.005.
- Greyzeck, Ed (2013), "Rosetta", NSS Data Center, NASA, retrieved 30 March 2013.
- Takir, Driss; Emery, Joshua P. (June 2012), "Outer Main Belt asteroids: Identification and distribution of four 3-μm spectral groups", Icarus, vol. 219, no. 2, pp. 641–654, Bibcode:2012Icar..219..641T, doi:10.1016/j.icarus.2012.02.022.
External links
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На других языках
[de] (140) Siwa
(140) Siwa ist ein Asteroid des Asteroiden-Hauptgürtels, der am 13. Oktober 1874 von Johann Palisa entdeckt wurde. Der Name leitet sich von der slawischen Göttin Siwa ab.
- [en] 140 Siwa
[es] (140) Siwa
(140) Siwa es un asteroide perteneciente al cinturón de asteroides descubierto el 13 de octubre de 1874 por Johann Palisa desde el observatorio de Pula, Croacia.[2]
Está nombrado por Siva, diosa eslava de la fertilidad.[3]
[fr] (140) Siwa
(140) Siwa est un important astéroïde de la ceinture principale découvert par Johann Palisa le 13 octobre 1874 et nommé d'après Siwa, déesse slave de la fertilité.
[ru] (140) Жива
(140) Жива (лат. Siwa) — крупный астероид главного пояса, который относится к довольно редкому спектральному классу P. Открыт 13 октября 1874 года австрийским астрономом Иоганном Пализой в обсерватории Пула и назван в честь Живы, славянской богини жизни и плодородия[1]. Полученные кривые блеска этого астероида позволяют говорить о сферической форме данного тела.
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