735 Marghanna

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735 Marghanna (prov. designation: Template:Mp or Template:Mp) is a large carbonaceous background asteroid from the central regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 9 December 1912, by German astronomer Heinrich Vogt at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The dark C-type asteroid (Ch) has a rotation period of 20.6 hours and is rather regular in shape. It was named after Margarete Vogt and after Hanna, the mother and a relative of the discoverer, respectively.[2]

Orbit and classification

Marghanna 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 1.9–3.6 AU once every 4 years and 6 months (1,647 days; semi-major axis of 2.73 AU). Its orbit has an eccentricity of 0.32 and an inclination of 17° with respect to the ecliptic.[6] The body's observation arc begins at Heidelberg Observatory on 29 November 1921, almost nine years after its official discovery observation.[1]

Naming

This minor planet was named by the discoverer Heinrich Vogt after his mother Margarete Vogt and after one of his relatives, Hanna. The Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 74Script error: No such module "Check for unknown parameters".).[2]

Physical characteristics

In the Tholen classification and in the SDSS-based taxonomy, Marghanna is a common, carbonaceous C-type asteroid, while in the Bus–Binzel SMASS classification, it is a hydrated C-type (Ch).[6][4][7]

Rotation period

In May 2011, a rotational lightcurve of Marghanna was obtained from photometric observations by American astronomer Brian Skiff and collaborators using telescopes at the Lowell Observatory in Flagstaff, Arizona. The 2019-revised lightcurve analysis gave a well-defined rotation period of (Script error: No such module "val".) hours with a small brightness variation of (Script error: No such module "val".) magnitude, indicative of a rather spherical shape (U=3Script error: No such module "Check for unknown parameters".).[8] Lower rated measurements determined a period of 15.95 hours (Rafa Mohamed, 1995),[9] 24 hours (Raymond Poncy, 2005)[10] and Script error: No such module "val". hours (Brian Skiff, 2014) 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=2/1+/3−Script error: No such module "Check for unknown parameters".).[11]

Diameter and albedo

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Marghanna 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.[12][13][14]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0423 and a diameter of 74.23 kilometers based on an absolute magnitude of 9.7,[11] while the Cornell Mid-IR Asteroid Spectroscopy (MIDAS) survey determined a diameter of (Script error: No such module "val".) kilometers and Benoit Carry one of (Script error: No such module "val".) kilometers.[15][16] Alternative mean-diameters published by the WISE team include (Script error: No such module "val".), (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) with a corresponding albedo of (Script error: No such module "val".), (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".).[4][11]

Two asteroid occultations on 11 March 2008 and on 4 May 2010, gave a best-fit ellipse dimension of (Script error: No such module "val".) and (Script error: No such module "val".), respectively, each 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 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". (PDS data set)
  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". (online, AcuA catalog p. 153)
  15. ↑ Script error: No such module "Citation/CS1". See Table 1.
  16. ↑ Script error: No such module "Citation/CS1".

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External links

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