2018 WV1
2018 WV1 is a very small asteroid and near-Earth object of the Apollo group that passed within 27,000 kilometers (17,000 miles) of the Earth's surface on 2 December 2018.[6][7] It was first observed on 29 November 2018 by Hannes Gröller with the Catalina Sky Survey at Catalina Station on Mount Bigelow, Arizona, in the United States.[1][3]
2018 WV1's flyby trajectory | |
Discovery [1] | |
---|---|
Discovered by | CSS H. Groeller[2][3] |
Discovery site | Catalina Station |
Discovery date | 29 November 2018 (first observed only) |
Designations | |
2018 WV1 | |
ZW0C3A5 | |
NEO · Apollo [1][4] Earth crosser | |
Orbital characteristics [4] | |
Epoch 27 April 2019 (JD 2458600.5) | |
Uncertainty parameter 2 | |
Observation arc | 13 days |
Aphelion | 1.1021 AU |
Perihelion | 0.9767 AU |
1.0394 AU | |
Eccentricity | 0.0603 |
1.06 yr (387 d) | |
169.02° | |
0° 55m 48.36s / day | |
Inclination | 1.6525° |
246.42° | |
145.89° | |
Earth MOID | 0.039 LD (12900 km) |
Physical characteristics | |
Mean diameter | 4 m (assumed)[5] |
30.145[5] 30.183[4] 30.2[1] | |
Orbit
2018 WV1 orbits the Sun at a distance of 0.98–1.10 AU once every 387 days (semi-major axis of 1.04 AU). Its orbit has an eccentricity of 0.06 and an inclination of 2° with respect to the ecliptic.[4]
As an Apollo asteroid with an orbital period slightly larger than that of the Earth, its orbit is very similar to that of the Earth, indicating that the object is a piece of lunar ejecta, a fragment of the Moon that was ejected into space when a larger asteroid hit the Moon a long time ago.[7]
2018 flyby
On 2 December 2018, the asteroid passed about 33,000 km (21,000 mi) from Earth, traveling 5.2 kilometres per second (3.2 mi/s) relative to Earth and briefly reaching apparent magnitude 17.[4] This was the third-closest approach by an asteroid in 2018, and the 70th asteroid of the year that passed within 1 lunar distance of Earth.[6] Its absolute magnitude of 30.1 indicates a diameter between 2.5 and 5.6 metres.[7]
2018 WV1 remains inside the Earth's sphere of influence from 27 November till 7 December 2018.[8] During the flyby, its orbital period changes from 1.13 to 1.06 years.
At the time of its discovery, 2018 WV1 had a 2% chance to hit Earth in early December 2018. The possibility of impact was ruled out soon after, as more data became available.[7]
Other flybys
2018 WV1 will pass within 0.38 AU (57,000,000 km) of Earth in December 2019.[4]
With a short observation arc of 1.69 days, the asteroid is on the Sentry risk list, with a probability of 1 in 11,000 for an impact between 2085 and 2118.[9]
Flyby gallery
- Its closest approach will be between the earth and sun, so can't be observed.
- Animation of 2018 WV1 orbit around Earth
Moon · Earth · 2018 WV1 - Animation of 2018 WV1 orbit around Sun from 2017 to 2021
Sun · Earth · 2018 WV1
References
- "2018 WV1". Minor Planet Center. Retrieved 7 January 2019.
- "MPEC 2018-W81 : 2018 WV1". Minor Planet Center. 30 November 2018. Retrieved 1 December 2018.
- "A small rock discovered this week by our observer Hannes Gröller". Catalina Sky Survey. 1 December 2018. Retrieved 1 December 2018.
- "JPL Small-Body Database Browser: (2018 WV1)" (2018-12-12 last obs.). Jet Propulsion Laboratory. Retrieved 7 January 2019.
- "2018WV1 physical properties". European Space Agency. 1 December 2018. Retrieved 1 December 2018.
- "Asteroid 2018 WV1 will flyby Earth at a very close distance of 0.09 LD on December 2, 2018". The Watchers. 30 November 2018. Retrieved 1 December 2018.
- Byrd, D. (1 December 2018). "Small asteroid to sweep close this weekend". earthsky.org. Retrieved 1 December 2018.
- "Earth's Busy Neighborhood". hohmanntransfer.com. Asteroid/Comet Connection. 1 December 2018. Retrieved 2 December 2018.
- "2018 WV1 -- Earth Impact Risk Summary". JPL. 30 November 2018. Retrieved 1 December 2018.
External links
- List Of Apollo Minor Planets (by designation), Minor Planet Center
- 2018 WV1 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 2018 WV1 at the JPL Small-Body Database