(469219) Kamo'oalewa
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Asteroid (469219) Kamoʻoalewa |
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| Simulated orbit of (469219) 2016 HO 3 . | |
| Properties of the orbit ( animation ) | |
| Orbit type | Near-Earth asteroid, Apollo-type |
| Major semi-axis | 1.001 AU |
| eccentricity | 0.104 |
| Perihelion - aphelion | 0.897 AU - 1.105 AU |
| Inclination of the orbit plane | 7.8 ° |
| Length of the ascending node | 66.2 ° |
| Argument of the periapsis | 306.5 ° |
| Time of passage of the perihelion | 4th October 2019 |
| Sidereal period | 365 d 21 h |
| Mean orbital velocity | 29.69 km / s |
| Physical Properties | |
| Medium diameter | 40-100 m |
| Rotation period | 0.467 h |
| Absolute brightness | 24.3 mag |
| history | |
| Explorer | Pan-STARRS 1 |
| Date of discovery | April 27, 2016 |
| Another name | 2016 HO 3 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(469219) Kamoʻoalewa (also called 2016 HO 3 ) is an asteroid that was discovered on April 27, 2016 by the large ground-based telescope Pan-STARRS 1 (Panoramic Survey Telescope And Rapid Response System) in the Haleakalā National Park in Hawaii . It is probably the most stable quasi-satellite on earth . He is an Earth orbit cruisers from the Apollo-type and orbits the sun on one of the earth's orbit very similar orbit .
Naming
The name is of Hawaiian origin and was explained as follows:
"Kamoʻoalewa alludes to a celestial object that is oscillating, like its path in the sky as viewed from the Earth. It is a name found in the Hawaiian chant Kumulipo. He ʻāpana hōkūnaʻi i lele mai kona kino nui, he holo pū me ka honua a puni ka lā. "
The name was announced on April 6, 2019.
Orbit
Kamoʻoalewa needs 366 days for one orbit around the sun , on average it is 1.0012 astronomical units away from the sun, which corresponds practically exactly to the distance between earth and sun. With an eccentricity of e = 0.103, the orbit of the planetoid is significantly more elliptical than the earth's orbit and inclined 7.78 degrees compared to the ecliptic of the earth's orbit plane. After its discovery, Kamo'oalewa was identified on recordings from March 17, 2004 and thus its orbit was calculated more precisely. In October 2019, there were 307 observations on 9 oppositions over a period of 14 years.
Kamoʻoalewa's maximum distance from the earth (apogee) is 100 times the distance from the earth to the moon. It comes no closer to it than 13.8 lunar distances. The closest approximation was reached in the 1920s with 12 million kilometers. In the next 200 years, the distance at perigee will always be no less than 16 million kilometers.
Over several decades, the orbit of the asteroid changes slightly due to gravitational and non-gravitational influences.
Orbit development
Precise calculations indicate that Kamo'oalewa has been a stable quasi-satellite on Earth for almost a century and will remain so for the next few centuries. Kamo'oalewa is not caught in the earth's gravitational field, but its orbit is strongly influenced by it.
Calculations have shown that Kamoʻoalewa will leave its unstable orbit around the earth around the year 2341 and then assume a horseshoe orbit for at least 1300 years . One period on this horseshoe orbit will be about 300 years.
exploration
The Chinese space agency is preparing a sample return mission to Kamo'oalewa. As of April 2019, the probe is scheduled to launch with a Changzheng 3B rocket in 2022 . The Qian Xuesen Laboratory for Space Technology , a strategic research center of the China Academy of Space Technology, already conducted a feasibility study for the mission under the direction of Zhang Xiaojing, but made the final decision on the financing of the company, which subsequently became the main belt comet (7968 ) Elst-Pizarro is to lead is still pending. During a ceremony in Beijing on April 18, 2019, Chinese universities and private companies as well as foreign research institutes were invited to contribute to the mission with payloads. 66.3 kg should be available for eight scientific experiments.
gallery
Asteroid (469219) Kamoʻoalewa / 2016 HO 3 is a constant earth companion.
Asteroid (469219) Kamoʻoalewa / 2016 HO 3 , orbit around the sun and earth (animation).
See also
Web links
- Spektrum.de : Asteroid 2016 HO3 - a longtime companion of the earth June 16, 2016
- astronews.com: Almost like a tiny moon on Earth June 17, 2016
Individual evidence
- ↑ Agle, DC; Brown, Dwayne; Cantillo, Laurie (June 15, 2016). Small Asteroid Is Earth's Constant Companion
- ↑ a b (469219) Kamoʻoalewa in the Small-Body Database of the Jet Propulsion Laboratory (English).
- ↑ Minor Planet Circ. 112435
- ↑ (469219) Kamoʻoalewa in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- ↑ (469219) Kamoʻoalewa at the IAU Minor Planet Center (English)
- ↑ JPL near approach data
- ↑ PhysX3D (GRAVITY SIMULATION) Earth's second moon - 2016 HO3. August 16, 2016, accessed on August 17, 2016 (German, English).
- ^ Qian Xuesen Laboratory of Space Technology (Qian Lab). In: cast.cn. Retrieved May 12, 2019 .
- ↑ Mike Wall: China to Launch Ambitious Asteroid-Comet Mission in 2022. In: space.com. April 18, 2019, accessed May 12, 2019 .
- ^ Zhang Xiaojing et al .: ZhengHe - A Mission to a Near-Earth Asteroid and a Main Belt Comet. (PDF) Retrieved May 12, 2019 (English).
- ↑ 国家 航天 局 交接 嫦娥 四号 国际 载荷 科学 数据 发布 月球 与 深 空 探测 合作 机会. In: .clep.org.cn. April 18, 2019, accessed May 12, 2019 (Chinese).
- ↑ 甘 永 、 杨瑞洪: 小行星 探测 任务 有效 载荷 和 搭载 项目 机遇 公告. In: cnsa.gov.cn. April 19, 2019, accessed May 12, 2019 (Chinese).