1026 Ingrid
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1026 Ingrid, provisional designation , is a stony Florian
asteroid An asteroid is a minor planet of the Solar System#Inner solar system, inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic o ...
and long- lost minor planet (1923–1986) from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Karl Reinmuth at Heidelberg in 1923, and later named after Ingrid, niece and godchild of astronomer
Albrecht Kahrstedt Albrecht ("noble", "bright") is a given name or surname of German origin and may refer to: First name *Albrecht Agthe, (1790–1873), German music teacher *Albrecht Altdorfer, (c. 1480–1538) German Renaissance painter *Albrecht Becker, (1906–2 ...
.


Discovery and recovery

''Ingrid'' was discovered on 13 August 1923, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was observed for only a few days during August 1923, before it became a lost minor planet for nearly 63 years until its recovery by Japanese astronomer
Syuichi Nakano is a Japanese astronomer. He specializes in the study of comets, in particular calculating their orbits and making predictions about when periodic comets will return for another perihelion approach. It is considerably more difficult to predict th ...
in 1986. Nakano was able to show that ''Ingrid'' had been observed and provisionally designated several times during its lost period: as at the discovering Heidelberg Observatory in October 1957, possibly as at
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 effo ...
in April 1963, as at the Crimean Astrophysical Observatory in November 1981, and as at Palomar Observatory in March 1986. With the recovery of ''Ingrid'' in 1986, and the almost simultaneously recovered asteroid
1179 Mally 1179 Mally, provisional designation , is an asteroid and long-lost minor planet from the central region of the asteroid belt, approximately 13 kilometers in diameter. Discovered by Max Wolf in 1931, the asteroid was lost until its rediscovery in 1 ...
, the list of long-lost numbered asteroids was reduced to four. The last remaining lost asteroid, 69230 Hermes, was recovered in 2003.


Orbit and classification

''Ingrid'' is a member of the Flora family (), a giant asteroid family and the largest family of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7  AU once every 3 years and 5 months (1,237 days). Its orbit has an eccentricity of 0.18 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 Plane of reference, reference plane and the orbital plane or Axis of rotation, axis of direction of the orbiting object ...
of 5 ° with respect to the
ecliptic The ecliptic or ecliptic plane is the orbital plane of the Earth around the Sun. From the perspective of an observer on Earth, the Sun's movement around the celestial sphere over the course of a year traces out a path along the ecliptic agai ...
. The body's
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 ...
begins at Heidelberg, one night after its official discovery observation in 1923.


Physical characteristics

''Ingrid'' is an assumed S-type asteroid, in-line with the Flora family's spectral type.


Rotation period

A rotational
lightcurve In astronomy, a light curve is a graph of light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y axis and with time on the x axis. The light is usually in a particular frequ ...
of ''Ingrid'' was obtained from photometric observations by a group of Hungarian astronomers. The 2005-published lightcurve analysis gave 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 5 hours with a brightness variation of 0.5 magnitude ().


Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's
Wide-field Infrared Survey Explorer Wide-field Infrared Survey Explorer (WISE, observatory code C51, Explorer 92 and SMEX-6) is a NASA infrared astronomy space telescope in the Explorers Program. It was launched in December 2009, and placed in hibernation mode in February 2 ...
, ''Ingrid'' measures between 5.73 and 7.67 kilometers in diameter and its surface has an albedo between 0.1441 and 0.43. The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 8.19 kilometers based an
absolute magnitude Absolute magnitude () is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it we ...
of 12.6.


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 '' ...
was named after Ingrid, niece and godchild of Albrecht Kahrstedt (1897–1971), a German astronomer at ARI and director of the institute's Potsdam division, who requested the naming of this asteroid and 984 Gretia (mother of Ingrid) in a personal letter to the discoverer in February 1926. Kahrstedt himself was honored with the naming of . The official naming citation was mentioned in '' The Names of the Minor Planets'' by Paul Herget in 1955 ().
Lutz Schmadel Lutz Dieter Schmadel (2 July 1942, in Berlin – 21 October 2016) was a German astronomer and a prolific discoverer of asteroids, who worked at the Astronomisches Rechen-Institut (ARI) of the University of Heidelberg. His special interest wa ...
quoted an excerpt of Kahrstedt's letter in his ''Dictionary of Minor Planet Names'' (LDS).


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:Ingrid 001026 Discoveries by Karl Wilhelm Reinmuth Named minor planets 19230813