735 Marghanna ('' prov. designation:'' ''or'' ) is a large carbonaceous background asteroid from the central regions of the asteroid belt, approximately in diameter. It was discovered on 9 December 1912, by German astronomer Heinrich Vogt at the Heidelberg-Königstuhl State Observatory in southwest Germany. The dark C-type asteroid (Ch) has a

rotation period The rotation period of a celestial object (e.g., star, gas giant, planet, moon, asteroid) may refer to its sidereal rotation period, i.e. the time that the object takes to complete a single revolution around its axis of rotation relative to the ...

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.

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. It orbits the Sun in the

central Central is an adjective usually referring to being in the center of some place or (mathematical) object. Central may also refer to: Directions and generalised locations * Central Africa, a region in the centre of Africa continent, also known as ...

asteroid belt at a distance of 1.9–3.6 AU once every 4 years and 6 months (1,647 days;

semi-major axis In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the two most widely separated points of the perimeter. The semi-major axis (major semiaxis) is the long ...

of 2.73 AU). Its orbit has an eccentricity of 0.32 and an inclination of 17 ° with respect to the ecliptic. The body's observation arc begins at Heidelberg Observatory on 29 November 1921, almost nine years after its official discovery observation.

Naming

This minor planet was named by the discoverer Heinrich Vogt after his mother Margarete Vogt and after one of his relatives, Hanna. The was mentioned in '' The Names of the Minor Planets'' by Paul Herget in 1955 ().

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 An asteroid spectral type is assigned to asteroids based on their emission spectrum, color, and sometimes albedo. These types are thought to correspond to an asteroid's surface composition. For small bodies that are not internally differentiat ...

, it is a hydrated C-type (Ch).

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 Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States. Lowell Observatory was established in 1894, placing it among the oldest observatories in the United States, and was designated a National Historic Landmark ...

in Flagstaff, Arizona. The 2019-revised lightcurve analysis gave a well-defined

of () hours with a small brightness variation of () magnitude, indicative of a rather spherical shape (). Lower rated measurements determined a period of 15.95 hours (Rafa Mohamed, 1995), 24 hours (Raymond Poncy, 2005) and hours (Brian Skiff, 2014) with an amplitude of , and magnitude, respectively ().

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 (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively. 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, while the Cornell Mid-IR Asteroid Spectroscopy (MIDAS) survey determined a diameter of () kilometers and Benoit Carry one of () kilometers. Alternative mean-diameters published by the WISE team include (), (), () and () with a corresponding albedo of (), (), () and (). Two asteroid occultations on 11 March 2008 and on 4 May 2010, gave a best-fit ellipse dimension of () and (), respectively, each with an itermediate quality rating of 2. These timed observations are taken when the asteroid passes in front of a distant star.

References

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External links

Lightcurve Database Query
(LCDB), at ''www.minorplanet.info''
Dictionary of Minor Planet Names
Google books

– '' Geneva Observatory'', Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000)
– Minor Planet Center * * {{DEFAULTSORT:Marghanna 000735 Discoveries by Heinrich Vogt Named minor planets 000735 000735 19121209