Английская Википедия:517 Edith

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Edith (minor planet designation: 517 Edith), provisional designation Шаблон:Mp, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 83 kilometers in diameter. It was discovered on 22 September 1903, by American astronomer Raymond Dugan at the Heidelberg-Königstuhl State Observatory in southwest Germany, who named it after his sister Edith Eveleth.

Orbit and classification

Edith orbits the Sun in the outer main-belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,050 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.

The body's observation arc begins at Heidelberg, five days after its official discovery observation (first recorded observation at the MPC).

Physical characteristics

In the Tholen taxonomy, Edith is an X-type asteroid. Due to its very low albedo, a more specific P-type is derived by the LCDB, while a spectroscopic survey of Tholen X-type asteroids characterizes Edith as a C-type asteroid.

Rotation period

In October 2009, the best-rated rotational lightcurve of Edith was obtained from photometric observations by French amateur astronomer Maurice Audejean at his Chinon Observatory (Шаблон:Small) in Chinon, France. Lightcurve analysis gave a well-defined rotation period of 9.2747 hours with a brightness variation of 0.16 magnitude (Шаблон:Small), indicating that the body is rather spheroidal.

Additional measurements of the asteroid's period were made by French amateur astronomers René Roy and Laurent Bernasconi, as well as by American astronomer Robert Koff at his Antelope Hills Observatory in Bennett, Colorado (Шаблон:Small) and by Alan W. Harris of the Earth and Planetary Physics Group at JPL in the 1980s (Шаблон:Small).Шаблон:Efn

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Edith measures between 79.72 and 111.89 kilometers in diameter and its surface has a low albedo between 0.026 and 0.05.

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0397 and a diameter of 83.24 kilometers based on an absolute magnitude of 9.52.

Naming

This minor planet was named by the discoverer after his sister Edith Eveleth (née Dugan). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small). Edith Eveleth also proposed and prepared the naming citation for Raymond Dugan's first discovery, Шаблон:MoMP.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• Шаблон:AstDys
• Шаблон:JPL small body