221628 Hyatt

221628 Hyatt, provisional designation 2006 YE₁₃, is a background asteroid on an inclined, comet-like orbit in the outer regions of the asteroid belt, approximately 7 kilometers (4 miles) in diameter. It was discovered on 26 December 2006, by Alex Gibbs, an American software engineer with the Catalina Sky Survey, who named it after his father and renowned physicist Hyatt M. Gibbs.

221628 Hyatt

Discovery
Discovered by	A. R. Gibbs
Discovery site	Catalina Sky Srvy.
Discovery date	26 December 2006
Designations
MPC designation	(221628) Hyatt
Named after	Hyatt M. Gibbs  (American physicist)
Alternative designations	2006 YE13 · 2001 ES12 2005 WG1
Minor planet category	main-belt  · (outer) background
Orbital characteristics
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	17.16 yr (6,266 d)
Aphelion	3.9134 AU
Perihelion	2.3515 AU
Semi-major axis	3.1324 AU
Eccentricity	0.2493
Orbital period (sidereal)	5.54 yr (2,025 d)
Mean anomaly	356.66°
Mean motion	0° 10m 40.08s / day
Inclination	32.475°
Longitude of ascending node	357.84°
Argument of perihelion	176.49°
TJupiter	2.9290
Physical characteristics
Mean diameter	3.8 km (est. at 0.22) 7.4 km (est. at 0.057) 9 km (est. at 0.039)
Absolute magnitude (H)	14.4

Orbit and classification

Hyatt is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer asteroid belt at a distance of 2.4–3.9 AU once every 5 years and 6 months (2,025 days; semi-major axis of 3.13 AU). Its orbit has an eccentricity of 0.25 and a notable inclination of 32° with respect to the ecliptic. While still considered a main-belt asteroid, Hyatt blurs the distinction between asteroids and comets due to its relatively high inclination and a Tisserand's parameter of 2.929, which already enters the territory of Jupiter-family comets.

The body's observation arc begins with a precovery taken by LONEOS in December 2000, or six years prior to its official discovery observation at Catalina.

Physical characteristics

Hyatt's spectral type is unknown. It has an absolute magnitude of 14.4.

Diameter and albedo

Hyatt has not been observed by any of the space-based surveys such as the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission. Based on a generic magnitude-to-diameter conversion, it measures approximately 7.4 kilometers in diameter for an absolute magnitude of 14.4, and an assumed albedo of 0.057. This is a typical value for carbonaceous C-type asteroids, which are the dominant type in the outer asteroid belt.

Rotation period

As of 2018, no rotational lightcurve of Hyatt has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.

Naming

This minor planet was named by the discoverer after his father, Hyatt M. Gibbs (1938–2012), who was a physicist and professor at the University of Arizona College of Optical Sciences. Gibbs is known for his research on quantum optics and received several awards. The official naming citation was published by the Minor Planet Center on 3 July 2012 (M.P.C. 79912), just two months before he died on 3 September 2012.

External links

• Hyatt M. Gibbs Archived 1 June 2010 at the Wayback Machine, Franklin Institute Awards, Franklin Laureate Database
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (220001)-(225000) – Minor Planet Center
• 221628 Hyatt at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 221628 Hyatt at the JPL Small-Body Database