Английская Википедия:4769 Castalia
Шаблон:Use dmy dates Шаблон:Infobox planet
4769 Castalia (Шаблон:IPAc-en; prov. designation: Шаблон:Mp) is a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately Шаблон:Convert in diameter and was the first asteroid to be modeled by radar imaging. It was discovered on 9 August 1989, by American astronomer Eleanor Helin (Caltech) on photographic plates taken at Palomar Observatory in California. It is named after Castalia, a nymph in Greek mythology. It is also a Mars- and Venus-crosser asteroid.[1]
General information
On 25 August 1989 Castalia passed Шаблон:Convert[2] (within eleven lunar distances) of Earth, allowing it to be observed with radar from the Arecibo Observatory by Scott Hudson (Washington State University) and Steven J. Ostro (JPL). The data allowed Hudson et al. to produce a three-dimensional model of the object. During the 1989 passage Castalia peaked at an apparent magnitude of 12.[3]
Castalia has a peanut shape, suggesting two approximately 800-meter-diameter pieces held together by their weak mutual gravity. Since then radar observations of other asteroids have found other contact binaries.[4]
Castalia is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 150 meters. The Earth-MOID is Шаблон:Convert.[1] Its orbit is well-determined for the next several hundred years.
| Date | JPL Horizons nominal geocentric distance (AU) |
uncertainty region (3-sigma) |
|---|---|---|
| 2023-Aug-22 09:21 | Шаблон:Convert[1] | ±Шаблон:Val[5] |
See also
References
External links
- Шаблон:Cite web
- NASA Asteroid Radar Search – The 228 Radar-Detected Asteroids: Asteroid 4769 Castalia
- Шаблон:NeoDys
- Шаблон:ESA-SSA
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Authority control
- ↑ 1,0 1,1 1,2 1,3 Ошибка цитирования Неверный тег
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<ref>; для сносокBinaryне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокCA2023не указан текст
- Английская Википедия
- Apollo asteroids
- Discoveries by Eleanor F. Helin
- Named minor planets
- Potentially hazardous asteroids
- Contact binary (small Solar System body)
- Radar-imaged asteroids
- Astronomical objects discovered in 1989
- Near-Earth objects in 2023
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