Английская Википедия:909 Ulla
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet
909 Ulla is a large and dark asteroid from the outermost regions of the asteroid belt, that measures approximately Шаблон:Convert in diameter. It is the parent body and namesake of the Ulla family, which belongs to the larger group of Cybele asteroids. It was discovered on 7 February 1919, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[1] The X-type asteroid has a rotation period of 8.7 hours and a notably low value for its Jupiter Tisserand's parameter. It was named after Ulla Ahrens, daughter of a friend of the discoverer.[2]
Orbit and classification
Ulla is the parent body of the Ulla family (Шаблон:Small),[3] a very small asteroid family of less than 30 known bodies.[4] It orbits the Sun in the outermost asteroid belt at a distance of 3.2–3.9 AU once every 6 years and 8 months (2,435 days; semi-major axis of 3.54 AU). Its orbit has an eccentricity of 0.09 and an inclination of 19° with respect to the ecliptic.[5]
Naming
This minor planet was named after Ulla Ahrens, a daughter of a friend of the discoverer.[2] Karl Reinmuth also named the asteroid 950 Ahrensa for the Ahrens family, who was a donor of the Heidelberg Observatory. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]
Physical characteristics
In the SMASS classification, Ulla is an X-type asteroid.[5][6]
Rotation period
A rotational lightcurve of Ulla was obtained from photometric observations in 2000. Lightcurve analysis gave a rotation period of 8.73 hours with a brightness amplitude between 0.13 and 0.24 magnitude (Шаблон:Small).[7] Other photometric period determinations gave concurring results.[8][9]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the Japanese Akari satellite, Ulla measures Шаблон:Val and Шаблон:Val kilometers in diameter and its surface has an albedo between Шаблон:Val and Шаблон:Val.[10][11] The Collaborative Asteroid Lightcurve Link uses an albedo of 0.0450 and derives a diameter of 116.66 kilometers based on an absolute magnitude of 8.65.[12]
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
- Ulla asteroids
- Cybele asteroids
- Discoveries by Karl Wilhelm Reinmuth
- Named minor planets
- X-type asteroids (Tholen)
- Astronomical objects discovered in 1919
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