822 Lalage

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822 Lalage (prov. designation: Template:Mp or Template:Mp) is a background asteroid from the inner regions of the asteroid belt. It was discovered on 31 March 1916, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The likely highly elongated asteroid with an unclear spectral type has a short rotation period of 3.3 hours and measures approximately Script error: No such module "convert". in diameter. Any reference to the origin of the asteroid's name is unknown.[2]

Orbit and classification

Lalage 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 main-belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,237 days; semi-major axis of 2.26 AU). Its orbit has an eccentricity of 0.16 and an inclination of 1° with respect to the ecliptic.[5] The body's observation arc begins at the Bergedorf Observatory on 6 April 1916, one week after its official discovery observation at Heidelberg.[1]

Naming

Any reference of this minor planet's name to a person or occurrence is unknown.[2]

Unknown meaning

Among the many thousands of named minor planets, Lalage is one of 120 asteroids for which Template:MoMP has been published. All of these asteroids have low numbers, the first one being Template:Mp. The last asteroid with a name of unknown meaning is Template:Mp. They were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[6]

Physical characteristics

In the Tholen classification, Lalage has an unusual spectrum, that is closest to a dark D-type, somewhat similar to an X-type, and, to a lesser extent, a carbonaceous C-type asteroid.[5] Conversely, the Small Solar System Objects Spectroscopic Survey (S3OS2), classifies the body an uncommon A-type in the survey's Tholen-like taxonomic variant, and as an Sl-subtype – which transitions from the stony S-type to the uncommon L-type asteroid – in its SMASS-like variant.[4][7]

Rotation period

In September 1992, a rotational lightcurve of Lalage was obtained from photometric observations by Polish astronomer Wiesław Wiśniewski. Lightcurve analysis gave a short 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 a non-spherical, elongated shape (U=3Script error: No such module "Check for unknown parameters".).[8] Since then, additional period determinations gave Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".) by David Higgins in October 2009,[9] Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".) by Robert Stephens in January 2014,[10] and Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=3−Script error: No such module "Check for unknown parameters".) by Daniel A. Klinglesmith in February 2014.[11] A modeled lightcurves using photometric data from the BlueEye600 robotic telescope Template:Obscode at Ondřejov Observatory gave a sidereal period of Script error: No such module "val".. The modelling also gave two poles at (343.0°, −74.0°) and (133.0°, −75.0°) in ecliptic coordinates (λ, β).[12]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, Lalage measures (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".) and (Script error: No such module "val".), respectively.[13][14] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and a diameter of 10.16 kilometers based on an absolute magnitude of 12.33.[15] The WISE team also published an alternative mean-diameter of (Script error: No such module "val".) with an albedo of (Script error: No such module "val".).[4]

References

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  1. ↑ a b Script error: No such module "citation/CS1".
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  4. ↑ a b c Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  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. ↑ 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". (online, AcuA catalog p. 153)
  15. ↑ Script error: No such module "citation/CS1".

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External links

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