Discovery [1] | |
---|---|
Discovered by | Catalina Sky Srvy. |
Discovery site | Mount Lemmon Obs. |
Discovery date | 27 April 2006 |
Designations | |
(391211) 2006 HZ51 | |
2006 HZ51 | |
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 |
1.8974 AU | |
Eccentricity | 0.4499 |
2.61 yr (955 days) | |
86.571° | |
0° 22m 37.56s / day | |
Inclination | 12.412° |
84.291° | |
193.34° | |
Earth MOID | 0.0354 AU (13.8 LD) |
Physical characteristics | |
0.412±0.089 km [3] 0.8 km (estimate) [4] | |
0.415±0.233 [3] | |
18.5 [1] | |
(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]
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.
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).
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]
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]
This minor planet has not yet been named. [2]
4401 Aditi is an eccentric, stony asteroid, classified as a near-Earth object and Amor asteroid, approximately 1.8 kilometers in diameter. It was discovered on 14 October 1985 by American astronomer Carolyn Shoemaker at Palomar Observatory in California, and later named after the Hindu goddess Aditi.
2368 Beltrovata, provisional designation 1977 RA, is an eccentric stony asteroid and near-Earth object of the Amor group, approximately 2.7 kilometers in diameter. It was discovered on 4 September 1977, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland. The asteroid was named for Betty Tendering, a friend of author Gottfried Keller.
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(162058) 1997 AE12 is a stony, sub-kilometer asteroid and likely the slowest rotator known to exist. It is classified as near-Earth object of the Amor group and measures approximately 800 meters in diameter. The asteroid was discovered on 10 January 1997 by the Spacewatch survey at Kitt Peak National Observatory near Tucson, Arizona
(190166) 2005 UP156 is a stony asteroid and binary system, classified as near-Earth object of the Apollo group, approximately 1 kilometer in diameter. It was discovered on 31 October 2005, by astronomers of the Spacewatch survey at the Kitt Peak National Observatory in Arizona, United States. Its minor-planet moon with an orbital period of 40.25 hours was discovered in 2017.
(89830) 2002 CE, is a stony asteroid, classified as near-Earth object and potentially hazardous asteroid of the Amor group, approximately 3.1 kilometers in diameter. It was discovered on 1 February 2002, by astronomers of the LINEAR program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. This asteroid is one of the largest potentially hazardous asteroid known to exist.
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