astro.wikisort.org - Asteroid
809 Lundia is a small, binary, V-type asteroid[3] orbiting within the Flora family in the main belt. It is named after Lund Observatory, Sweden.
 Asteroid 809 Lundia (apparent magnitude 16.6) near a mag 15.6 star | |
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery date | 11 August 1915 |
| Designations | |
MPC designation | (809) Lundia |
| Pronunciation | /ˈlʌndiə/ |
Named after | Lund Observatory |
Alternative designations | 1915 XP; 1936 VC |
Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 100.48 yr (36700 d) |
| Aphelion | 2.72316 AU (407.379 Gm) |
| Perihelion | 1.84193 AU (275.549 Gm) |
Semi-major axis | 2.28254 AU (341.463 Gm) |
| Eccentricity | 0.19304 |
Orbital period (sidereal) | 3.45 yr (1259.6 d) |
Mean anomaly | 76.7867° |
Mean motion | 0° 17m 8.912s / day |
| Inclination | 7.14911° |
Longitude of ascending node | 154.580° |
Argument of perihelion | 196.162° |
| Physical characteristics | |
| Dimensions | 10.26 ± 0.07 km[2] |
| Mass | (9.27 ± 3.09) × 1014 kg[2] |
Mean density | 1.64 ± 0.10 g/cm3[2] |
Synodic rotation period | 15.4142 h (0.64226 d) |
Spectral type | V |
Absolute magnitude (H) | 12.2 |
Characteristics
Lundia orbits within the Flora family. However, its V-type spectrum indicates that it is not genetically related to the Flora family, but rather is probably a fragment (two fragments, if its moon is included) ejected from the surface of 4 Vesta by a large impact in the past. Its orbit lies too far from Vesta for it to actually be a member of the Vesta family. It is not clear how it arrived at an orbit so far from Vesta, but other examples of V-type asteroids orbiting fairly far from their parent body are known. A mechanism of interplay between the Yarkovsky effect and nonlinear secular resonances (primarily involving Jupiter and Saturn) has been proposed.[4]
Binary system
Lightcurve observations in 2005 revealed that Lundia is a binary system of two similarly sized objects orbiting their common centre of gravity. "Lundia" now refers to one of the objects, the other being provisionally designated S/2005 (809) 1. The similarity of size between the two components is suspected because during mutual occultations the brightness drops by a similar amount independently of which component is hidden.[5] Due to the similar size of the primary and secondary the Minor Planet Center lists this as a binary companion.[6]
Assuming an albedo similar to 4 Vesta (around 0.4) suggests that the components are about 7 km across. They orbit each other in a period of 15.4 hours,[5] which roughly indicates that the separation between them is very close: to the order of 10–20 km if typical asteroid albedo and density values are assumed.
References
- "809 Lundia (1915 XP)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 4 May 2016.
- Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- M. Florczak; D. Lazarro & R. Duffard (2002). "Discovering New V-Type Asteroids in the Vicinity of 4 Vesta". Icarus. 159: 178–182. Bibcode:2002Icar..159..178F. doi:10.1006/icar.2002.6913.
- V. Carruba, et al. (2005). "On the V-type asteroids outside the Vesta family". Astronomy & Astrophysics. 441 (2): 819–829. arXiv:astro-ph/0506656. Bibcode:2005A&A...441..819C. doi:10.1051/0004-6361:20053355.
- Poznań observatory "Physical studies of asteroids at Poznan Observatory". Archived from the original on 2 July 2001. Retrieved 2 July 2001. (Lightcurve showing signature of the binary)
- "Satellites and Companions of Minor Planets". IAU / Central Bureau for Astronomical Telegrams. Archived from the original on 21 January 2011. Retrieved 3 July 2011.
External links
- Electronic Telegram No. 239 announcing the binary system (2005 October 1)
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- (809) Lundia, datasheet, johnstonsarchive.net
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- Lightcurve showing signature of the binary
- 809 Lundia at AstDyS-2, Asteroids—Dynamic Site
- 809 Lundia at the JPL Small-Body Database
На других языках
[de] (809) Lundia
(809) Lundia ist ein Asteroid des inneren Hauptgürtels. Der Asteroid hat einen Durchmesser von 6,9 km. Zusammen mit seinem Mond S/2005 (809) 1, der mit einem Durchmesser von etwa 6,1 km geringfügig kleiner als Lundia ist, bildet Lundia ein Doppelasteroidensystem.- [en] 809 Lundia
[ru] (809) Лундия
(809) Лундия (лат. Lundia) — небольшой двойной астероид главного пояса, который принадлежит к спектральному классу V[1] и входит в состав семейства Флоры. Он был открыт 11 августа 1915 года немецким астрономом Максом Вольфом в обсерватории Хайдельберг и назван в честь города Лунда и Лундской обсерватории в Швеции[2].Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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