Английская Википедия:896 Sphinx
Шаблон:Use dmy dates Шаблон:Infobox planet
896 Sphinx Шаблон:IPAc-en is a background asteroid from the inner regions of the asteroid belt, that measures approximately Шаблон:Convert in diameter. It was discovered on 1 August 1918, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The asteroid has a rotation period of 21.0 hours and is one of few low-numbered objects for which no spectral type has been determined. It was named after the Sphinx, a creature from Greek and Egyptian mythology.[2]
Orbit and classification
Sphinx is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4] It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.7 AU once every 3 years and 6 months (1,262 days; semi-major axis of 2.29 AU). Its orbit has an eccentricity of 0.16 and an inclination of 8° with respect to the ecliptic.[5] The body's observation arc begins at Heidelberg Observatory on 9 October 1918, two months after its official discovery observation.[1]
Naming
This minor planet was named after the Sphinx, a legendary creature from Greek and Egyptian mythology. The female monster has the head of a woman, the haunches of a lion, and the wings of a bird. It has the habit of killing anyone who cannot answer her riddle. The Шаблон:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]
Physical characteristics
Contrary to most other low-numbered asteroids, no spectral type has been determined.[4][6] Based on its relatively high albedo (see below) and its location within the inner parts of the main-belt, Sphinx may possibly be a common, stony S-type asteroid.
Rotation period
In June 2018, a rotational lightcurve of Sphinx was obtained from photometric observations by Tom Polakis at the Command Module Observatory Шаблон:Obscode in Arizona. Lightcurve analysis gave a rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small). However, an alternative period solution of Шаблон:Val hours with an amplitude of Шаблон:Val magnitude is also possible.[7] Both results supersede a tentative period determination by Laurent Bernasconi from September 2001 (Шаблон:Small).[8]
A modeled lightcurve using photometric data from the Lowell Photometric Database and from the Wide-field Infrared Survey Explorer (WISE) was published in 2018. It gave a divergent sidereal period of Шаблон:Val hours and includes two spin axes at (172.0°, 20.0°) and (352.0°, 42.0°) in ecliptic coordinates (λ, β).[9]
Diameter and albedo
According to the surveys carried out by the NEOWISE mission of NASA's WISE telescope, the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Sphinx measures (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) kilometers in diameter and its surface has an albedo of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val), respectively.[10][11][12] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2332 and a diameter of 13.17 kilometers based on an absolute magnitude of 11.6.[6] Alternative mean-diameter measurements published by the WISE team include (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with corresponding albedos of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[4][6]
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
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
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- Английская Википедия
- Background asteroids
- Discoveries by Max Wolf
- Named minor planets
- Astronomical objects discovered in 1918
- Sphinxes
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