Английская Википедия:898 Hildegard
Шаблон:Use dmy dates Шаблон:Infobox planet
898 Hildegard Шаблон:IPAc-en is a bright background asteroid, approximately Шаблон:Convert in diameter, that is located in the central regions of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 3 August 1918 and given the provisional designations Шаблон:Mp and Шаблон:Mp.[1] The stony S-type asteroid (Sl) has a rotation period of 24.9 hours and a relatively high orbital eccentricity of 0.37. It was probably named after Saint Hildegard of Bingen (1098–1179).[2]
Orbit and classification
Hildegard 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 central asteroid belt at a distance of 1.7–3.7 AU once every 4 years and 6 months (1,648 days; semi-major axis of 2.73 AU). Its orbit has a high eccentricity of 0.37 and an inclination of 10° with respect to the ecliptic.[5] With a perihelion of 1.72 AU, Hildegard is notably close of becoming an outer-grazer to Mars, which has its aphelion at 1.67 AU. The body's observation arc begins at Heidelberg Observatory with its official discovery observation on 3 August 1918.[1]
Naming
This minor planet was probably named after Saint Hildegard of Bingen (1098–1179). The Benedictine abbess is considered to be the founder of scientific natural history in Germany. The Шаблон:MoMP was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]
Physical characteristics
In the Bus–Binzel SMASS classification, Hildegard is an Sl-subtype, which transitions from the common stony S-type to the uncommon L-type asteroid.[5][4]
Rotation period
In April 2008, a rotational lightcurve of Hildegard was obtained from photometric observations by Australian amateur astronomer David Higgins. Lightcurve analysis gave a well-defined rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[6] Previously in June 1999, observations by Brian Warner at his Palmer Divide Observatory Шаблон:Obscode in Colorado only gave a period of above 24 hours and an amplitude larger than 0.3 magnitude (Шаблон:Small).[7]Шаблон:Efn Asteroid's with a rotation period near 24 hours are difficult to observe, since full coverage can not be obtained by a few consecutive nights of observation from a single observatory alone, due to Earth's nearly synchronous rotation. In such cases, international collaborations are highly useful with each observatory covering a different section of the lightcurve.
In 2016, a modeled lightcurve gave a concurring sidereal period of Шаблон:Val hours using data from a large collaboration of individual observers (such as above). The study also determined two spin axes of (344.0°, 27.0°) and (164.0°, 8.0°) in ecliptic coordinates (λ, β).[8]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Hildegard measures Шаблон:Val kilometers in diameter and its surface has an albedo of Шаблон:Val.[4][9] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 13.58 kilometers based on an absolute magnitude of 11.7.[6]
Notes
References
External links
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- 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
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- Discoveries by Max Wolf
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- Hildegard of Bingen
- Sl-type asteroids (SMASS)
- Astronomical objects discovered in 1918
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