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881 Athene

Stony background asteroid

Field	Value
minorplanet	yes
name	881 Athene
background	#D6D6D6
image	000881-asteroid shape model (881) Athene.png
caption	Modelled shape of Athene from its lightcurve
discovery_ref
discoverer	M. F. Wolf
discovery_site	Heidelberg Obs.
discovered	22 July 1917
mpc_name	(881) Athene
alt_names	A917 OD1917 CL
pronounced
adjective	Athenian
named_after	Goddess Athena
(Greek mythology)
mp_category	{{plainlist
* main-belt<ref name	"MPC-object" /(middle)
* background<ref name	"AstDys-object" /}}
orbit_ref
epoch	31 May 2020 (JD 2459000.5)
uncertainty	0
observation_arc	102.53 yr (37,449 d)
aphelion	3.1510 AU
perihelion	2.0764 AU
semimajor	2.6137 AU
eccentricity	0.2056
period	4.23 yr (1,543 d)
mean_anomaly	121.30°
mean_motion	/ day
inclination	14.191°
asc_node	277.03°
arg_peri	41.313°
mean_diameter	{{plainlist
* {{val	12.04	0.28	ul	km}}
* {{val	12.153	0.101	u	km}}
rotation	}}
pole_ecliptic_lat	{{plainlist
* (123.0°, −58.0°) (λ<sub>1</sub>/β<sub>1</sub>)<ref name	"Ferret" /
* {{nowrap	(337.0°, −47.0°) (λ<sub>2</sub>/β<sub>2</sub>)<ref name	"Ferret" /}}}}
albedo	{{plainlist
* <ref name	"Masiero-2014" /
* <ref name	"AKARI" /}}
spectral_type	{{plainlist
* S <ref name	"Lazzaro-2004" /
* Sl <ref name	"Lazzaro-2004" /
* L <ref name	"SDSS-Taxonomy" /}}
abs_magnitude	11.8

(Greek mythology)

main-belt(middle)
background}}
(123.0°, −58.0°) (λ1/β1)
(337.0°, −47.0°) (λ2/β2)}}
}}
S (S3OS2-TH)
Sl (S3OS2-BB)
L (SDSS-MOC)}}

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 12 km in diameter. It was named after Athena, the goddess of wisdom in Greek mythology. According to Astrophysicist Rayme Traub at JHU APL NASA, Europa Clipper will make a pass by Athene in 2027 after passing Earth on its way to Jupiter. Europa Clipper will test its sensors on Athene in preparation for Europa in 2030.

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 (H 86). 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

Noah Webster (1884) ''A Practical Dictionary of the English Language''

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