(391211) 2006 HZ51

(391211) 2006 HZ₅₁

Discovery[1]
Discovered by	Catalina Sky Survey
Discovery date	27 April 2006
Designations
Alternative names	none
Minor planet category	Amor
Orbital characteristics[2][3]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc	4775 days (13.07 yr)
Aphelion	2.75104 AU (411.550 Gm)
Perihelion	1.04323 AU (156.065 Gm)
Semi-major axis	1.89714 AU (283.808 Gm)
Eccentricity	0.45010
Orbital period	2.61 yr (954.43 d)
Average orbital speed	20.48 km/s
Mean anomaly	220.298°
Mean motion	0° 22^m 37.873^s / day
Inclination	12.4138°
Longitude of ascending node	84.3150°
Argument of perihelion	193.332°
Earth MOID	0.0331954 AU (4.96596 Gm)
Jupiter MOID	2.3967 AU (358.54 Gm)
Jupiter Tisserand parameter	3.796
Physical characteristics
Dimensions	~800 meters[4]
Mass	~5.4×10^11 kg
Mean density	2.0? g/cm³
Equatorial surface gravity	~0.0002 m/s²
Equatorial escape velocity	~0.0004 km/s
Geometric albedo	0.10?
Temperature	~202 K
Absolute magnitude (H)	18.5[3]

(391211) 2006 HZ₅₁ is an 800 meter in diameter asteroid discovered on 27 April 2006 by the Catalina Sky Survey that with a 1.1 day observation arc was 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 orbit solution was at first thought to have a period of 7 years and a perihelion of ~1.1 AU. [MPEC 2006-H58, 28 April 2006, 2-day orbit].

References

1. "Discovery Circumstances: Numbered Minor Planets". Minor Planet Center.
2. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
3. "JPL Small-Body Database Browser: 391211 (2006 HZ51)". Jet Propulsion Laboratory. Retrieved 9 April 2016.
4. Big new asteroid has slim chance of hitting Earth - New Scientist

External links

• (391211) 2006 HZ51 at the JPL Small-Body Database
  • Discovery · Orbit diagram · Orbital elements · Physical parameters