astro.wikisort.org - Asteroid

(391211) 2006 HZ₅₁ is a bright, sub-kilometer asteroid on an eccentric orbit, classified as a near-Earth object and a potentially hazardous asteroid of the Amor group. It was discovered on 27 April 2006, by astronomers of the Catalina Sky Survey conducted at Mount Lemmon Observatory, Arizona, United States.[2] During preliminary observations, it was thought to have a small chance of impacting Earth in 2008.[4] The asteroid measures approximately half a kilometer in diameter and has an exceptionally high albedo.[3]

(391211) 2006 HZ₅₁

Discovery[1]
Discovered by	Catalina Sky Srvy.
Discovery site	Mount Lemmon Obs.
Discovery date	27 April 2006
Designations
MPC designation	(391211) 2006 HZ51
Alternative designations	2006 HZ51
Minor planet category	Amor · NEO · PHA[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	16.10 yr (5,882 days)
Aphelion	2.7511 AU
Perihelion	1.0438 AU
Semi-major axis	1.8974 AU
Eccentricity	0.4499
Orbital period (sidereal)	2.61 yr (955 days)
Mean anomaly	86.571°
Mean motion	0° 22m 37.56s / day
Inclination	12.412°
Longitude of ascending node	84.291°
Argument of perihelion	193.34°
Earth MOID	0.0354 AU (13.8 LD)
Physical characteristics
Mean diameter	0.412±0.089 km[3] 0.8 km (estimate)[4]
Geometric albedo	0.415±0.233[3]
Absolute magnitude (H)	18.5[1]

Orbit and classification

2006 HZ₅₁ is an Amor asteroid – a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it.[1][2]

It orbits the Sun at a distance of 1.04–2.75 AU once every 2 years and 7 months (955 days; semi-major axis of 1.90 AU). Its orbit has an eccentricity of 0.45 and an inclination of 12° with respect to the ecliptic.[1] The body's observation arc begins with a precovery taken by NEAT at Palomar Observatory in October 2001.[2] With an aphelion of 2.75 AU, and typical for members of the Amor group, this asteroid is also a Mars-crosser, crossing the orbit of the Red Planet at 1.666 AU.

Close approaches

2006 HZ₅₁ has a minimum orbital intersection distance (MOID) with Earth of 5,290,000 km (0.035385 AU), which translates into 13.8 lunar distances.[1]

This makes it a potentially hazardous asteroid, a body with a threatening close approach to the Earth, due to its low MOID and large size (absolute magnitude of 18.5). Such asteroids are defined to have an absolute magnitude of 22 or brighter – which generically corresponds to a diameter of approximately 140 meters – and a MOID that is smaller than 0.05 AU or 19.5 LD.

Based on a short observation arc of only 1.1 days, it was originally thought to have a 1 in 6 million chance of hitting Earth on 21 June 2008.[4] Further refinement of the orbit quickly eliminated the risk. The preliminary 2-day orbit solution on 28 April 2006 was at first thought to have a period of 7 years and a perihelion of approximately 1.1 AU (MPEC 2006-H58).

Physical characteristics

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2006 HZ₅₁ measures 412 meters in diameter and its surface has an exceptionally high albedo of 0.415.[3] Other source give an estimated diameter of 800 meters.[4]

Rotation period

As of 2018, n rotational lightcurve of 2006 HZ₅₁ has been obtained from photometric observations. The body's rotation period, pole and shape remains unknown.[1][5]

Naming

This minor planet has not yet been named.[2]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• (391211) 2006 HZ51 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• (391211) 2006 HZ51 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• (391211) 2006 HZ51 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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- [en] (391211) 2006 HZ51

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[es] (391211) 2006 HZ51

(391211) 2006 HZ51 es un asteroide perteneciente al grupo de los asteroides Amor descubierto el 27 de abril de 2006 por el programa espacial Catalina Sky Survey desde las montañas de Santa Catalina en Estados Unidos. Tiene unos 800 metros de diámetro.

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[ru] (391211) 2006 HZ51

2006 HZ51 — небольшой околоземный астероид из группы Амура (II), который был открыт 27 апреля 2006 года в рамках проекта «Обзор Каталина». Астероид пока не имеет собственного имени.

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