astro.wikisort.org - Asteroid

(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]

(585310) 2017 YZ₁

Discovery[1]
Discovered by	Mount Lemmon Srvy.
Discovery site	Mount Lemon Obs.
Discovery date	20 December 2017
Designations
MPC designation	(585310) 2017 YZ1
Alternative designations	2017 YZ1
Minor planet category	NEO · PHA · Apollo[1][2]
Orbital characteristics[2]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 0
Observation arc	8.78 (3,206 days)
Aphelion	1.7715 AU
Perihelion	0.8830 AU
Semi-major axis	1.3272 AU
Eccentricity	0.3347
Orbital period (sidereal)	1.53 yr (558 d)
Mean anomaly	43.773°
Mean motion	0° 38m 40.551s / day
Inclination	20.875°
Longitude of ascending node	277.75°
Argument of perihelion	298.39°
Earth MOID	0.00012 AU (0.047 LD)
Physical characteristics
Mean diameter	0.26 km[3]
Absolute magnitude (H)	20.43[2]

Orbit and classification

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

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

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

• List of asteroid close approaches to Earth in 2018

References

External links

• 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
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• (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

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