Английская Википедия:5535 Annefrank
Шаблон:Short description Шаблон:Infobox planet
Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2
5535 Annefrank (Шаблон:IPAc-en), provisional designation Шаблон:Mp, is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter. It was used as a target to practice the flyby technique that the Stardust space probe would later use on the comet Wild 2.[1]
The asteroid was discovered 23 March 1942, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany.[2] It was named after Anne Frank, a victim of the Holocaust.[3]
Orbit and classification
Annefrank is a member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 3 months (1,202 days). Its orbit has an eccentricity of 0.06 and an inclination of 4° with respect to the ecliptic.[4]
The body's observation arc begins at Crimea–Nauchnij in 1978, with its identification as Шаблон:Mp, 36 years after its official discovery observation at Heidelberg.[2]
Physical characteristics
Annefrank has been characterized as a common S-type asteroid.[5][1]
Diameter, albedo and shape
On 2 November 2002, the Stardust space probe flew past Annefrank at a distance of 3079 km. Its images show the asteroid to be 6.6 × 5.0 × 3.4 km, twice as big as previously thought, and its main body shaped like a triangular prism with several visible impact craters.[1] From the photographs, the albedo of Annefrank was computed to be between 0.18 and 0.24.[1] Preliminary analysis of the Stardust imagery suggests that Annefrank may be a contact binary, although other possible explanations exist for its observed shape.[1]
Rotation and poles
In October 2006, ground-based photometric observations were used in an attempt to measure AnnefrankШаблон:'s rotational period. Analysis of the ambiguous lightcurve gave a period of Шаблон:Val hours and a brightness variation of 0.25 magnitude with two alternative period solutions of 12 and 22.8 hours, respectively (Шаблон:Small).[5][6]
In January 2014, photometric observations at the Palomar Transient Factory gave a rotation period of Шаблон:Val and Шаблон:Val hours with an amplitude of 0.17 and 0.20 magnitude, respectively (Шаблон:Small).[7][8]
The lightcurve data suggests that Annefrank is not Lambertian, meaning that surface features, such as shadows from boulders and craters, play a role in the object's perceived brightness and not just the asteroid's relative size when seen from that orientation.[6]
The body's shortest axis is approximately aligned perpendicular to its orbital plane.[1]
Naming
This minor planet was named after Anne Frank, the Dutch-Jewish diarist who died in a Nazi concentration camp (World War II).[3] The official naming citation was published by the Minor Planet Center on 14 May 1995 (Шаблон:Small).[9]
References
External links
- A page with images from the Stardust flyby Шаблон:Webarchive
- Ted Stryk's Stardust page, including enhanced images of 5535 Annefrank
- 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 (5001)-(10000) – Minor Planet Center
- Шаблон:JPL Small Body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Anne Frank Шаблон:Cultural depictions of Anne Frank Шаблон:Authority control
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- Astronomical objects discovered in 1942
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