746 Marlu

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746 Marlu (prov. designation: Template:Mp or Template:Mp) is a dark and large background asteroid from the outer regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 1 March 1913, by German astronomer Franz Kaiser at the Heidelberg Observatory in southwest Germany.[1] The primitive P-type asteroid has a rotation period of 7.8 hours. It was named after the discoverer's daughter, Marie-Louise Kaiser.[2]

Orbit and classification

Marlu 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 outer asteroid belt at a distance of 2.4–3.8 AU once every 5 years and 6 months (2,003 days; semi-major axis of 3.11 AU). Its orbit has an eccentricity of 0.24 and an inclination of 17° with respect to the ecliptic.[5] The body's observation arc begins at Heidelberg on 12 September 1915, more than two years after its official discovery observation.[1]

Naming

Franz Kaiser named this minor planet after his daughter, the physician Marie-Louise Kaiser. The discoverer also named another asteroid, 743 Eugenisis, in honor of his daughter. The Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 75Script error: No such module "Check for unknown parameters".).[2]

Physical characteristics

In the Tholen classification, Marlu is a dark and primitive P-type asteroid,[5] while it is an X-type and P-type asteroid, in the Tholen- and SMASS-like taxonomic variant of the Small Solar System Objects Spectroscopic Survey (S3OS2), respectively.[4][6] P-type asteroids are common in the outer asteroid belt and among the Jupiter trojan population. In the Moving Object Catalog (MOC) of the Sloan Digital Sky Survey, however, Marlu is a common carbonaceous C-type asteroid.[7]

Rotation period and poles

In September 1981, a rotational lightcurve of Marlu was obtained from photometric observations by American astronomer Alan W. Harris. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness variation of Script error: No such module "val". magnitude (U=2Script error: No such module "Check for unknown parameters".).[8] In October 2014, Daniel A. Klinglesmith confirmed the exact same period of (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".).[9]

In 2016, a modeled lightcurve gave a concurring sidereal period of Script error: No such module "val". hours using data from a large collaboration of individual observers. The study also determined two spin axes of (202.0°, −66.0°) and (64.0°, −27.0°) in ecliptic coordinates (λ, β).[4][10][11]

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), Marlu 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 a low albedo of Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".), respectively.[12][13][14]

The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.0431 and derives a diameter of 69.87 kilometers based on an absolute magnitude of 9.81.[10] 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 albedo of (Script error: No such module "val".) and (Script error: No such module "val".).[4][10] An asteroid occultation on 1 May 1985, gave a best-fit ellipse dimension of (Script error: No such module "val".) with an intermediate quality rating of 2.[4] These timed observations are taken when the asteroid passes in front of a distant star.[4]

References

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  1. ↑ a b Script error: No such module "citation/CS1".
  2. ↑ a b Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ a b c d e f 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". (PDS data set)
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b c 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". (online, AcuA catalog p. 153)
  14. ↑ Script error: No such module "Citation/CS1".

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External links

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