Английская Википедия:1119 Euboea

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1119 Euboea (Шаблон:IPAc-en; prov. designation: Шаблон:Mp) is a background asteroid from the central region of the asteroid belt. It was discovered on 27 October 1927, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid has a rotation period of 11.4 hours and measures approximately Шаблон:Convert in diameter. It was named for the Greek island of Euboea.

Orbit and classification

Euboea is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. It orbits the Sun in the central asteroid belt at a distance of 2.2–3.0 AU once every 4 years and 3 months (1,540 days; semi-major axis of 2.61 AU). Its orbit has an eccentricity of 0.16 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with a recovered observation from the Lowell Observatory in April 1930, more than 2 years after to its official discovery observation.

Naming

This minor planet was named after Euboea, also known as "Negropont", the largest island of Greece in the Aegean Sea. The Шаблон:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).

Physical characteristics

Euboea is an assumed stony S-type asteroid.

Rotation period and poles

In October 2007, a first rotational lightcurve of Euboea was obtained from photometric observations by astronomers at the Oakley Southern Sky Observatory in Australia. Lightcurve analysis gave a rotation period of 11.41 hours with a brightness variation of 0.50 magnitude (Шаблон:Small). In April 2010, a similar period of 11.396 hours and an amplitude of 0.46 magnitude was measured by French amateur astronomer Pierre Antonini (Шаблон:Small).

In 2016, two modeled lightcurves were published using photometric data from the Lowell Photometric Database and other sources. They gave a concurring sidereal period of 11.3981 and 11.39823 hours, respectively. Each study also determined two respective spin axes of (79.0°, 75.0°) and (282.0°, 55.0°), and (71.0°, 61.0°) and (280.0°, 54.0°) in ecliptic coordinates (λ, β).

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Euboea measures between 18.37 and 31.90 kilometers in diameter and its surface has an albedo between 0.0576 and 0.213. The Collaborative Asteroid Lightcurve Link derives a low albedo of 0.0539 – typical for carbonaceous C-type asteroids – and a diameter of 31.46 kilometers based on an absolute magnitude of 11.3.

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• Шаблон:AstDys
• Шаблон:JPL small body