1682 Karel, provisional designation , is a stony Florian
asteroid
An asteroid is a minor planet of the 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 or icy bodies with no atmosphere.
...
from the inner regions of the
asteroid belt
The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...
, approximately 7.5 kilometers in diameter.
It was discovered on 2 August 1949, by German astronomer
Karl Reinmuth
Karl Wilhelm Reinmuth (4 April 1892 in Heidelberg – 6 May 1979 in Heidelberg) was a German astronomer and a prolific discoverer of 395 minor planets.
Scientific career
From 1912 to 1957, Reinmuth was working as an astronomer at the Heid ...
at
Heidelberg Observatory
Heidelberg (; Palatine German: ') is a city in the German state of Baden-Württemberg, situated on the river Neckar in south-west Germany. As of the 2016 census, its population was 159,914, of which roughly a quarter consisted of student ...
in southern Germany, and later named after the son of Dutch astronomer couple
Ingrid
Ingrid may refer to:
* Ingrid (given name)
* Ingrid (record label), and artist collective
* Ingrid Burley, rapper known mononymously as Ingrid
* Tropical Storm Ingrid, various cyclones
* 1026 Ingrid, an asteroid
* InGrid, the grid computing project ...
and
Cornelis van Houten
Cornelis Johannes van Houten (18 February 1920 – 24 August 2002) was a Dutch astronomer, sometimes referred to as Kees van Houten.
Early life and education
Born in The Hague, he spent his entire career at Leiden University except for a brief p ...
.
Orbit and classification
''Karel'' is a member of the
Flora family
The Flora family (''adj. Florian''; ; also known as ''Ariadne family'') is a prominent family of stony asteroids located in the inner region of the asteroid belt. It is one of the largest families with more than 13,000 known members, or approxi ...
, one of the largest collisional populations of
stony asteroids in the
inner
Interior may refer to:
Arts and media
* ''Interior'' (Degas) (also known as ''The Rape''), painting by Edgar Degas
* ''Interior'' (play), 1895 play by Belgian playwright Maurice Maeterlinck
* ''The Interior'' (novel), by Lisa See
* Interior de ...
main-belt. It orbits the Sun at a distance of 1.8–2.7
AU once every 3 years and 4 months (1,223 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 0.19 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 4
° 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 again ...
.
In 1929, ''Karel'' was first identified as at Heidelberg, extending 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 ...
by 20 years prior to its official discovery observation.
Physical characteristics
Rotation period
Astronomers
François Colas
This is a list of minor-planet discoverers credited by the Minor Planet Center with the discovery of one or several minor planets (such as near-Earth and main-belt asteroids, Jupiter trojans and distant objects). , the discovery of 612,011 numb ...
, Jean Lecacheux, Federico Manzini and
Raoul Behrend
This is a list of minor-planet discoverers credited by the Minor Planet Center with the discovery of one or several minor planets (such as near-Earth and main-belt asteroids, Jupiter trojans and distant objects). , the discovery of 612,011 num ...
obtained 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 freq ...
of ''Karel'' from photometric observations in January 2008. It gave a well-defined
rotation period of 3.37485 hours with a brightness variation of 0.47 in
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 ...
().
An identical period was modeled from the Lowell Photometric Database ().
Diameter and albedo
According to the survey carried out by the Japanese
Akari
Akari (ASTRO-F) was an infrared astronomy satellite developed by Japan Aerospace Exploration Agency, in cooperation with institutes of Europe and Korea. It was launched on 21 February 2006, at 21:28 UTC (06:28, 22 February JST) by M-V rocke ...
satellite and 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 201 ...
with its subsequent
NEOWISE
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 201 ...
mission, ''Karel'' measures 4.80 and 7.27 kilometers in diameter, and its surface has an
albedo
Albedo (; ) is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body that refl ...
of 0.278 and 0.531, respectively.
The ''Collaborative Asteroid Lightcurve Link'' assumes an
albedo
Albedo (; ) is the measure of the diffuse reflection of solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body that refl ...
of 0.24 – derived from
8 Flora, the largest member and namesake of this family – and calculates a diameter of 7.47 kilometers based on an absolute magnitude of 12.8.
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 Karel van Houten, son of Dutch astronomers
Ingrid
Ingrid may refer to:
* Ingrid (given name)
* Ingrid (record label), and artist collective
* Ingrid Burley, rapper known mononymously as Ingrid
* Tropical Storm Ingrid, various cyclones
* 1026 Ingrid, an asteroid
* InGrid, the grid computing project ...
and
Cornelis van Houten
Cornelis Johannes van Houten (18 February 1920 – 24 August 2002) was a Dutch astronomer, sometimes referred to as Kees van Houten.
Early life and education
Born in The Hague, he spent his entire career at Leiden University except for a brief p ...
of the
Leiden Observatory
Leiden Observatory ( nl, Sterrewacht Leiden) is an astronomical institute of Leiden University, in the Netherlands. Established in 1633 to house the quadrant of Rudolph Snellius, it is the oldest operating university observatory in the world, wit ...
.
Together with Ingrid, Reinmuth discovered the minor planet
1691 Oort in 1956. Reinmuth also named his two discoveries,
1673 van Houten
Events
January–March
* January 22 – Impostor Mary Carleton is hanged at Newgate Prison in London, for multiple thefts and returning from penal transportation.
* February 10 – Molière's ''comédie-ballet'' '' The I ...
and
1674 Groeneveld, after the prolific couple of Dutch astronomers.
The official was published by the
Minor Planet Center on 15 December 1968 ().
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:Karel
001682
Discoveries by Karl Wilhelm Reinmuth
Named minor planets
19490802