706 Hirundo

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706 Hirundo (prov. designation: Template:Mp or Template:Mp) is an elongated background asteroid, located in the central region of the asteroid belt. It was discovered by German astronomer Joseph Helffrich at the Heidelberg Observatory on 9 October 1910.[1] The carbonaceous C-type asteroid (Cgh) has a rotation period of 22.0 hours and measures approximately Script error: No such module "convert". in diameter. It was named after the bird genus Hirundo, commonly known as swallows.[2]

Orbit and classification

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Orbit of #REDIRECT Template:Legend inline (2000–2020)
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Hirundo 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][5]

It orbits the Sun in the central asteroid belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,647 days; semi-major axis of 2.73 AU). Its orbit has an eccentricity of 0.19 and an inclination of 14° with respect to the ecliptic.[6] The body's observation arc begins at Vienna Observatory on 16 October 1910, or six nights after its official discovery observation by Joseph Helffrich at Heidelberg.[1]

Naming

This minor planet was named after bird genus Hirundo, a group of passerines in the family Hirundinidae (swallows and martins).[2] "Hirundo" is the Latin word for swallow. The Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 71Script error: No such module "Check for unknown parameters".).[2]

Physical characteristics

In both the Bus–Binzel (SMASS-II) and the Bus–DeMeo classification, Hirundo is a carbonaceous C-type asteroid (Cgh).[6][4][7]

Rotation period and poles

In September 2000, a rotational lightcurve of Hirundo was obtained from photometric observations by American Brian Warner at the Palmer Divide Observatory Template:Obscode in Colorado. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a high brightness variation of Script error: No such module "val". magnitude, indicative of an elongated shape (U=3Script error: No such module "Check for unknown parameters".).[8]Template:Efn During the same opposition, Bill Holliday measures a period of (Script error: No such module "val".) and an amplitude of (Script error: No such module "val".) magnitude at his River Oaks Observatory Template:Obscode in New Braunfels, Texas (U=3Script error: No such module "Check for unknown parameters".).[9] Further observations by René Roy (2011), Patrice Le Guen (2018), and Anaël Wünsche and Raoul Behrend (2020) determined a period of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) with an amplitude of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) magnitude, respectively (U=3/2/n.a.Script error: No such module "Check for unknown parameters".).[10]

Two lightcurves, published in 2016, using modeled photometric data from the Lowell Photometric Database (LPD) and other sources, gave a concurring period of (Script error: No such module "val".) and (Script error: No such module "val".) hours, respectively. Each modeled lightcurve also determined two spin axes of (92°, 66°) and (244°, 54°), as well as (91°, 70°) and (250°, 45°) in ecliptic coordinates (λ, β), respectively.[4][11][12][13]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Hirundo measures (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) kilometers in diameter and its surface has an albedo of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".), respectively.[14][15][16]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0853 and a diameter of 28.70 kilometers based on an absolute magnitude of 11.[11] The WISE-team also published two alternative mean-diameters of (Script error: No such module "val".) and (Script error: No such module "val".) with a corresponding albedos of (Script error: No such module "val".) and (Script error: No such module "val".).[4][11]

Notes

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References

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  1. ↑ a b Script error: No such module "citation/CS1".
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  4. ↑ a b c d Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1".} (PDS main page)
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1". (Catalog at PDS)
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ a b c Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  16. ↑ Script error: No such module "Citation/CS1".

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External links

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