astro.wikisort.org - Asteroid

881 Athene (prov. designation: A917 OD or 1917 CL) 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.[1] The likely elongated S/L-type asteroid has a rotation period of 13.9 hours and measures approximately 12 kilometers (7.5 miles) in diameter. It was named after Athena, the goddess of wisdom in Greek mythology.[3]

881 Athene

Modelled shape of Athene from its lightcurve
Discovery [1]
Discovered by	M. F. Wolf
Discovery site	Heidelberg Obs.
Discovery date	22 July 1917
Designations
MPC designation	(881) Athene
Pronunciation	/əˈθiːniː/[2]
Named after	Goddess Athena (Greek mythology)[3]
Alternative designations	A917 OD · 1917 CL
Minor planet category	main-belt [1][4] · (middle) background [5][6]
Adjectives	Athenian /əˈθiːniən/
Orbital characteristics [4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	102.53 yr (37,449 d)
Aphelion	3.1510 AU
Perihelion	2.0764 AU
Semi-major axis	2.6137 AU
Eccentricity	0.2056
Orbital period (sidereal)	4.23 yr (1,543 d)
Mean anomaly	121.30°
Mean motion	0° 13m 59.52s / day
Inclination	14.191°
Longitude of ascending node	277.03°
Argument of perihelion	41.313°
Physical characteristics
Mean diameter	12.04±0.28 km[7] 12.153±0.101 km[8]
Pole ecliptic latitude	(123.0°, −58.0°) (λ1/β1)[6] (337.0°, −47.0°) (λ2/β2)[6]
Geometric albedo	0.237±0.039[8] 0.237±0.012[7]
Spectral type	S (S3OS2-TH)[9] Sl (S3OS2-BB)[9] L (SDSS-MOC)[10]
Absolute magnitude (H)	11.8[1][4]

Orbit and classification

Located in or near the orbital region of the Eunomia family,[11] Athene is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[5][6] 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.[4] 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.[1]

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 naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 86). Asteroids 93 Minerva and 2 Pallas are both named after the goddess as well.[3]

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.[10] In the SMASS-like taxonomic variant of the S3OS2, Athene is an Sl-subtype that transitions between the S-and L-type.[6][9]

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 (A12), Italy, and by Jean-Gabriel Bosch at the Collonges Observatory (178), France. Lightcurve analysis gave a rotation period of 13.895±0.003 hours with a high brightness variation of 0.53±0.01 magnitude, indicative of a non-spherical, elongated shape (U=3−). In September 2010, French amateur astronomer René Roy measured a similar period of 13.881±0.001 hours and an amplitude of 0.39±0.02 (U=2+).[12][11]

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 13.89449±0.00001 and 13.8943±0.0005 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).[6][13][14]

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 (12.04±0.28) and (12.153±0.101) kilometers in diameter and its surface has an albedo of (0.237±0.012) and (0.237±0.039), respectively.[7][8] 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.[11] Alternative mean-diameter measurements published by the WISE team include (12.152±2.176 km), (12.369±0.285 km) and (12.671±0.077 km) with corresponding albedos of (0.278±0.128), (0.241±0.044) and (0.2111±0.0234).[6][11]

References

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
• 881 Athene at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 881 Athene at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (881) Athene

(881) Athene ist ein Asteroid des Hauptgürtels, der am 22. Juli 1917 vom deutschen Astronomen Max Wolf in Heidelberg entdeckt wurde.

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- [en] 881 Athene

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[ru] (881) Афина

881 Афина (881 Athene) — астероид Главного астероидного пояса. Это один из трёх астероидов, открытых 22 июля 1917 года немецким астрономом Максимилианом Вольфом в обсерватории Хайдельберг-Кёнигштуль, Германия. Астероид назван в честь Афины, греческой богини справедливой войны и мудрости.[3]

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