5010 Amenemhêt is a stony asteroid from the central region of the

asteroid belt The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies called asteroids ...

, approximately 9 kilometers in diameter. It was discovered on 24 September 1960, by Dutch astronomer couple

Ingrid Ingrid may refer to: * Ingrid (given name), including a list of people and fictional characters * Ingrid Burley (born 1986), rapper known mononymously as Ingrid * Ingrid (record label), also an artist collective * Tropical Storm Ingrid, various cy ...

and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer

Tom Gehrels Anton M.J. "Tom" Gehrels (February 21, 1925 – July 11, 2011) was a Dutch–American astronomer, Professor of Planetary Sciences, and Astronomer at the University of Arizona, Tucson. Biography Youth and education Gehrels was born at Ha ...

at the U.S

Palomar Observatory The Palomar Observatory is an astronomical research observatory in the Palomar Mountains of San Diego County, California, United States. It is owned and operated by the California Institute of Technology (Caltech). Research time at the observat ...

, California, and assigned the provisional designation . It was later named after the Egyptian pharaoh Amenemhět III.

Orbit and classification

''Amenemhêt'' orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,633 days). Its orbit has an

eccentricity Eccentricity or eccentric may refer to: * Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal" Mathematics, science and technology Mathematics * Off-Centre (geometry), center, in geometry * Eccentricity (g ...

of 0.20 and an

inclination Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a reference plane and the orbital plane or axis of direction of the orbiting object. For a satellite orbiting the Eart ...

of 15 ° with respect to the

ecliptic The ecliptic or ecliptic plane is the orbital plane of Earth's orbit, Earth around the Sun. It was a central concept in a number of ancient sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. Fr ...

. Its

observation arc In observational astronomy, the observation arc (or arc length) of a Solar System body is the time period between its earliest and latest observations, used for tracing the body's path. It is usually given in days or years. The term is mostly use ...

already begins in 1955, due to

precoveries In astronomy, precovery (short for pre-discovery recovery) is the process of finding the image of a celestial object in images or photographic plates predating its discovery, typically for the purpose of calculating a more accurate orbit. This ha ...

taken at the U.S.

Goethe Link Observatory The Goethe Link Observatory, observatory code 760, is an astronomical observatory near Brooklyn, Indiana, United States. It is owned by Indiana University and operated by the Indiana Astronomical Society https://iasindy.org/about.html, which eff ...

in Indiana.

Physical characteristics

In the SMASS taxonomic scheme, ''Amenemhêt'' is classified as a common stony asteroid with a S-type spectrum. It has also been characterized as a S-type by

Pan-STARRS The Panoramic Survey Telescope and Rapid Response System (Pan-STARRS1; List of observatory codes, obs. code: IAU code#F51, F51 and Pan-STARRS2 obs. code: IAU code#F52, F52) located at Haleakala Observatory, Hawaii, US, consists of astronomical ...

large-scale survey.

Lightcurve

A rotational

lightcurve In astronomy, a light curve is a graph (discrete mathematics), graph of the Radiance, light intensity of a celestial object or region as a function of time, typically with the magnitude (astronomy), magnitude of light received on the ''y''-axis ...

was obtained through photometric observations at the Serbian Belgrade Astronomical Observatory in May 2008. Lightcurve analysis showed a

period Period may refer to: Common uses * Period (punctuation) * Era, a length or span of time *Menstruation, commonly referred to as a "period" Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (o ...

of hours with a brightness amplitude of 0.18

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

(), superseding a previous lightcurve from two South-American observatories ().

Diameter and albedo

The ''Collaborative Asteroid Lightcurve Link'' assumes a standard

albedo Albedo ( ; ) is the fraction of sunlight that is Diffuse reflection, diffusely reflected by a body. It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects ...

for stony asteroids of 0.20 and calculates a diameter of 9.4 kilometers with an absolute magnitude of 12.5.

Palomar–Leiden survey

The

survey designation Provisional designation in astronomy is the naming convention applied to astronomical objects immediately following their discovery. The provisional designation is usually superseded by a permanent designation once a reliable orbit has been calcu ...

"P-L" stands for ''Palomar–Leiden'', named after Palomar Observatory and

Leiden Observatory Leiden Observatory () is an astronomical institute of Leiden University, in the Netherlands. Established in 1633 to house the quadrant of Willebrord Snellius, it is the oldest operating university observatory in the world, with the only older sti ...

, which collaborated on the fruitful

Palomar–Leiden survey The Palomar–Leiden survey (PLS) was a successful astronomical survey to study faint minor planets in a collaboration between the U.S Palomar Observatory and the Dutch Leiden Observatory, and resulted in the discovery of thousands of asteroids ...

in the 1960s. Gehrels used Palomar's

Samuel Oschin telescope The Samuel Oschin telescope (), also called the Oschin Schmidt, is a Schmidt camera at the Palomar Observatory in northern San Diego County, California, United States. It consists of a Schmidt corrector plate and a (f/2.5) mirror. The instrumen ...

– also known as the 48-inch Schmidt Telescope – and shipped the

photographic plate Photographic plates preceded film as the primary medium for capturing images in photography. These plates, made of metal or glass and coated with a light-sensitive emulsion, were integral to early photographic processes such as heliography, d ...

s to Ingrid and Cornelis van Houten at Leiden where

astrometry Astrometry is a branch of astronomy that involves precise measurements of the positions and movements of stars and other Astronomical object, celestial bodies. It provides the kinematics and physical origin of the Solar System and this galaxy, th ...

was carried out. The trio are credited with the discovery of several thousand minor planets.

Naming

This

minor planet According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor ...

was named after the Egyptian pharaoh Amenemhět III (1844–1797 B.C.), who built the Great Canal (Mer-Wer) and brought prosperity to the

Faiyum Oasis The Faiyum Oasis ( ''Wāḥat al-Fayyum'') is a depression or basin in the desert immediately west of the Nile river, 62 miles south of Cairo, Egypt. The extent of the basin area is estimated at between 1,270 km2 (490 mi2) and 1,700&nb ...

by linking it with the Nile. The area then became a breadbasket for the country. At the

Hawara Hawara is an archaeological site of Ancient Egypt, south of the site of Crocodilopolis ('Arsinoë', also known as 'Medinet al-Faiyum') at the entrance to the depression of the Fayyum oasis. It is the site of a pyramid built by Pharaoh Amenemhat ...

site in Faiyum, he built a

mortuary temple Mortuary temples (or funerary temples) were temples that were erected adjacent to, or in the vicinity of, royal tombs in Ancient Egypt. The temples were designed to commemorate the reign of the Pharaoh under whom they were constructed, as well as f ...

, which the Greek historian

Herodotus Herodotus (; BC) was a Greek historian and geographer from the Greek city of Halicarnassus (now Bodrum, Turkey), under Persian control in the 5th century BC, and a later citizen of Thurii in modern Calabria, Italy. He wrote the '' Histori ...

referred to as "labyrinth". Amenemhět's father was the pharaoh Sesostris III ''(also see the minor planets 4414 Sesostris and 3092 Herodotus)''. The official naming citation was published on 1 September 1993 ().

References

External links

Asteroid Lightcurve Database (LCDB)
query form

)
Dictionary of Minor Planet Names
Google books

– Observatoire de Genève, Raoul Behrend

– Minor Planet Center * * {{DEFAULTSORT:Amenemhet 005010 Discoveries by Cornelis Johannes van Houten Discoveries by Ingrid van Houten-Groeneveld Discoveries by Tom Gehrels 4594 Named minor planets 005010 19600924