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2018 WV1

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2018 WV1
2018 WV1's flyby trajectory
Discovery 
Discovered byCSS
H. Groeller
Discovery siteCatalina Station
Discovery date29 November 2018
(first observed only)
Designations
MPC designation2018 WV1
Alternative designationsZW0C3A5
Minor planet categoryNEO · Apollo 
Earth crosser
Orbital characteristics 
Epoch 6 December 2018 (JD 2458458.5)
Uncertainty parameter 2
Observation arc14 days
Aphelion1.1149 AU
Perihelion0.9715 AU
Semi-major axis1.0432 AU
Eccentricity0.0686
Orbital period (sidereal)1.065 yr (389 d)
Mean anomaly38.51°
Mean motion0° 55 30 / day
Inclination1.9054°
Longitude of ascending node248.51°
Argument of perihelion141.37°
Earth MOID0.1444 LD (55500 km)
Physical characteristics
Mean diameter4 m (assumed)
Absolute magnitude (H)30.145
30.183
30.2

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. 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.

Orbit

2018 WV1 orbits the Sun at a distance of 0.97–1.11 AU once every 389 days (semi-major axis of 1.04 AU). Its orbit has an eccentricity of 0.07 and an inclination of 2° with respect to the ecliptic.

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 could potentially be 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.

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. 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. Its absolute magnitude of 30.1 indicates a diameter between 2.5 and 5.6 metres.

2018 WV1 remained inside the Earth's sphere of influence from 27 November till 7 December 2018. During the flyby, its orbital period changed 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.

Other flybys

2018 WV1 passed within 0.38 AU (57,000,000 km) of Earth in December 2019.

The asteroid, when first discovered, was placed on the Sentry risk table. Further observations refined its orbit enough to remove it from the table on December 3, 2018

Flyby gallery

  • Its closest approach was between the Earth and Sun, so can't be observed. Its closest approach was 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 Earth
       Moon ·    Earth ·    2018 WV1
  • Animation of 2018 WV1 orbit around Sun from 2017 to 2021    Sun ·    Earth ·    2018 WV1 Animation of 2018 WV1 orbit around Sun from 2017 to 2021
       Sun ·    Earth ·    2018 WV1

See also

References

  1. ^ "2018 WV1". Minor Planet Center. Retrieved 7 January 2019.
  2. "MPEC 2018-W81 : 2018 WV1". Minor Planet Center. 30 November 2018. Retrieved 1 December 2018.
  3. ^ "A small rock discovered this week by our observer Hannes Gröller". Catalina Sky Survey. 1 December 2018. Retrieved 1 December 2018.
  4. ^ "JPL Horizons System: (2018 WV1)" (2018-12-12 last obs.). Jet Propulsion Laboratory. Retrieved 7 January 2019.
  5. ^ "2018WV1 physical properties". European Space Agency. 1 December 2018. Retrieved 1 December 2018.
  6. ^ "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.
  7. ^ Byrd, D. (1 December 2018). "Small asteroid to sweep close this weekend". earthsky.org. Retrieved 1 December 2018.
  8. "Earth's Busy Neighborhood". hohmanntransfer.com. Asteroid/Comet Connection. 1 December 2018. Archived from the original on 2 December 2018. Retrieved 2 December 2018.
  9. "2018 WV1 -- Earth Impact Risk Summary". JPL. 30 November 2018. Retrieved 1 December 2018.

External links

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