(585310) 2017 YZ₁

(585310) 2017 YZ₁, provisional designation: 2017 YZ₁, is a sub-kilometer asteroid on an eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 250 meters (800 feet) in diameter. It was first observed on 20 December 2017, by astronomers with the Mount Lemmon Survey at Mount Lemmon Observatory near Tucson, Arizona, in the United States.^[1][3] On 29 January 2018, it passed Earth at 125 lunar distances.^[2]

Orbit and classification[edit]

2017 YZ₁ is a member of the Apollo asteroids, which cross the orbit of Earth. Apollo's are the largest group of near-Earth objects with nearly 10 thousand known objects.

It orbits the Sun at a distance of 0.88–1.77 AU once every 18 months (558 days; semi-major axis of 1.33 AU). Its orbit has an eccentricity of 0.33 and an inclination of 21° with respect to the ecliptic.^[2]

Risk assessment[edit]

The 9 January 2018 solution with a 15-day observation arc was listed at Torino scale 1 with a 1:21,000 chance of impacting Earth on 30 June 2047. By 9 January 2018, the geocentric 30 June 2047 uncertainty region had shrunk to ±50 million km. With a longer 20 day observation arc, it dropped to Torino scale 0 and had a 1:670,000 chance of impacting Earth on 30 June 2047.^[3] On 18 January 2018 it was removed from the Sentry Risk Table. With a 28-day observation arc, the nominal solution suggests it will be about 0.25 AU (37,000,000 km) from Earth on 30 June 2047. The 3-sigma uncertainty in the 2047 close approach distance is about ±13 million km.

Numbering and naming[edit]

This minor planet was numbered by the Minor Planet Center on 10 August 2021, receiving the number (585310) in the minor planet catalog (M.P.C. 133609).^[4] As of 2021^[update], it has not been named.^[1]

See also[edit]

• List of asteroid close approaches to Earth in 2018

References[edit]

External links[edit]

• MPEC 2017-Y79 : 2017 YZ1, Minor Planet Electronic Circular
• CNEOS – Center for Near Earth Object Studies, NASA
• List Of Apollo Minor Planets (by designation), Minor Planet Center
• List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center
• Case Study of 2017 YZ1: Long-term Impact Monitoring and IAWN Archived 21 March 2018 at the Wayback Machine, IWAN
• Asteroid 2017 YZ1 Archived 7 August 2019 at the Wayback Machine, at Asteroidsnear.com
• (585310) 2017 YZ1 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• (585310) 2017 YZ1 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• (585310) 2017 YZ1 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters