881 Athene

881 Athene ( ''prov. designation'': ''or'' ) is a stony background asteroid from the central region of the asteroid belt. It was discovered on 22 July 1917, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany. The likely elongated S/L-type asteroid has a rotation period of 13.9 hours and measures approximately in diameter. It was named after Athena, the goddess of wisdom in Greek mythology.

Orbit and classification

Located in or near the orbital region of the Eunomia family, ''Athene'' 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 2.1–3.2  AU once every 4 years and 3 months (1,543 days; semi-major axis of 2.61 AU). Its orbit has an eccentricity of 0.21 and an inclination of 14 ° with respect to the ecliptic. The body's observation arc begins at Uccle Observatory on 8 August 1934, almost 17 years after its official discovery observation at Heidelberg on 22 July 1917.

Naming

This minor planet was named after Athena or "Pallas Athene", the goddess of wisdom in Greek mythology, also known as Minerva in Roman mythology. The was mentioned in '' The Names of the Minor Planets'' by Paul Herget in 1955 (). Asteroids 93 Minerva and 2 Pallas are both named after the goddess as well.

Physical characteristics

In the Tholen-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), ''Athene'' is a common, stony S-type asteroid, while in the SDSS-based taxonomy, it is an L-type asteroid. In the SMASS-like taxonomic variant of the S3OS2, ''Athene'' is an Sl-subtype that transitions between the S-and L-type.

Rotation period

In August 2006, a rotational lightcurve of ''Athene'' was obtained from photometric observations by Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station , Italy, and by Jean-Gabriel Bosch at the Collonges Observatory , France. Lightcurve analysis gave a rotation period of hours with a high brightness variation of magnitude, indicative of a non-spherical, elongated shape (). In September 2010, French amateur astronomer René Roy measured a similar period of hours and an amplitude of ().

Poles

Two lightcurves, published in 2016, using modeled photometric data from the Lowell Photometric Database (LPD) and other sources, gave a concurring sidereal period of and hours, respectively. Each modeled lightcurve also determined two spin axes of (123.0°, −58.0°) and (337.0°, −47.0°), as well as (115.0°, −77.0°) and (338.0°, −43.0°) 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 (WISE), ''Athene'' measures () and () kilometers in diameter and its surface has an albedo of () and (), respectively. The ''Collaborative Asteroid Lightcurve Link'' assumes a standard Eunomian albedo of 0.21 and calculates a diameter of 12.66 kilometers based on an absolute magnitude of 11.8. Alternative mean diameter measurements published by the WISE team include (), () and () with corresponding albedos of (), () and ().

References

External links

Lightcurve Database Query
(LCDB), at ''www.minorplanet.info''

Dictionary of Minor Planet Names
Google books


– ''Geneva Observatory'', Raoul Behrend

Discovery Circumstances: Numbered Minor Planets (1)-(5000)
– Minor Planet Center
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{{DEFAULTSORT:Athene
000881
Discoveries by Max Wolf
Named minor planets
19170722