166 Rhodope
   HOME

TheInfoList



OR:

166 Rhodope is a dark background
asteroid An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the Solar System#Inner Solar System, inner Solar System or is co-orbital with Jupiter (Trojan asteroids). As ...
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 55 kilometers in diameter. It was discovered on 15 August 1876, by German–American astronomer Christian Peters at the Litchfield Observatory in Clinton, New York, United States. The asteroid was named after
Queen Rhodope In ancient Greek and Roman mythology, Rhodope () is the wife of Haemus and queen of Thrace. She and her husband were punished together by being transformed into mountain ranges after daring to compare themselves to Zeus and Hera, the highest g ...
from Greek mythology.


Orbit and classification

''Rhodope'' is a non-
family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
asteroid of the main belt's background population, when applying the
Hierarchical Clustering Method An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. An ...
to its
proper orbital elements __NOTOC__ The proper orbital elements or proper elements of an orbit are constants of motion of an object in space that remain practically unchanged over an astronomically long timescale. The term is usually used to describe the three quantities ...
. Alternatively, it has been dynamically assigned to the stony
Eunomia family The Eunomia or Eunomian family () is a large asteroid family of S-type asteroids named after the asteroid 15 Eunomia. It is the most prominent family in the intermediate asteroid belt and the 6th-largest family with nearly six thousand known member ...
(), which have a different spectral class and albedo than that of ''Rhodope'' though. The asteroid has also been considered a member of the
Adeona family The Adeona or Adeonian family () is a large asteroid family that formed from the parent body 145 Adeona. Its spectral type is that of a carbonaceous C-type, with currently 2,236 asteroids identified as family members. Based upon simulation A s ...
. ''Rhodope'' orbits the Sun in the central asteroid belt at a distance of 2.1–3.3  AU once every 4 years and 5 months (1,607 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 0.21 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 12 ° 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 ...
. 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 with the first recorded observation by the
MPC MPC, Mpc or mpc may refer to: Astronomy * Megaparsec (Mpc), unit of length used in astronomy * Minor Planet Center, Smithsonian Astrophysical Observatory ** ''Minor Planet Circulars'' (MPC, M.P.C. or MPCs), astronomical publication from the Minor ...
at
Vienna Observatory The Vienna Observatory () is an astronomical observatory in Vienna, Austria. It is part of the University of Vienna. The first observatory was built in 1753–1754 on the roof of one of the university buildings. A new observatory was built betwe ...
on 10 September 1885, or more than 9 years after its official discovery observation at Clinton. On 19 October 2005, it was observed
occulting An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks f ...
the prominent star
Regulus Regulus is the brightest object in the constellation Leo (constellation), Leo and one of the List of brightest stars, brightest stars in the night sky. It has the Bayer designation designated α Leonis, which is Latinisation of names, ...
from
Vibo Valentia Vibo Valentia (; Monteleone before 1861; Monteleone di Calabria from 1861 to 1928; or ) is a city and ''comune'' (municipality) in the Italian region of Calabria, near the Tyrrhenian Sea. It is the capital of the province of Vibo Valentia, and ...
, Italy.


Physical characteristics


Spectral type

''Rhodope''s
spectral type In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the ...
is ambiguous. In the
Tholen classification An asteroid spectral type is assigned to asteroids based on their reflectance spectrum, color, and sometimes albedo. These types are thought to correspond to an asteroid's surface composition. For small bodies that are not internally different ...
, the noisy spectrum is closest to a G-type and somewhat similar to a common C-type (GC:). In the
SMASS classification An asteroid spectral type is assigned to asteroids based on their reflectance spectrum, color, and sometimes albedo. These types are thought to correspond to an asteroid's surface composition. For small bodies that are not internally different ...
, it is an Xe-subtype, that transitions from the X-type to the very bright E-type. In addition, ''Rhodope'' has also been characterized as a primitive P-type and carbonaceous C-type by the
Wide-field Infrared Survey Explorer Wide-field Infrared Survey Explorer (WISE, List of observatory codes, observatory code C51, Explorer 92 and MIDEX-6) was a NASA infrared astronomy Space observatory, space telescope in the Explorers Program launched in December 2009.. . WISE L ...
(WISE) and 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 ...
photometric survey, respectively.


Rotation period

Two well-defined 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 ...
s of ''Rhodope'' were obtained from photometric observations by French astronomer Matthieu Conjat and by an anonymous observer of the ''Collaborative Asteroid Lightcurve Link'' (CALL). Lightcurve analysis gave a consolidated
rotation period In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the '' sidereal rotation period'' (or ''sidereal day''), i.e., the time that the objec ...
of 4.715 hours with a brightness variation of 0.35 to 0.36
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 ...
(). The result supersedes a period of 7.87 hours measured by Alan Harris in the early 1980s ().


Poles

In 2013, the asteroid's lightcurve was also modeled from combined dense and sparse
photometry Photometry can refer to: * Photometry (optics), the science of measurement of visible light in terms of its perceived brightness to human vision * Photometry (astronomy), the measurement of the flux or intensity of an astronomical object's electr ...
. It gave a concurring sidereal period of 4.714793 hours. The modelling also determined two spin axis of (345.0°, −22.0°) and (173.0°, −3.0°) in
ecliptic coordinates In astronomy, the ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions, orbits, and pole orientations of Solar System objects. Because most planets (except Mercury) and many small So ...
(λ, β).


Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the
NEOWISE Wide-field Infrared Survey Explorer (WISE, observatory code C51, Explorer 92 and MIDEX-6) was a NASA infrared astronomy space telescope in the Explorers Program launched in December 2009.. . WISE discovered thousands of minor planets and nu ...
mission of NASA's WISE telescope, ''Rhodope'' measures between 39.04 and 65.29 kilometers in diameter and its surface has an
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 ...
between 0.046 and 0.10. CALL adopts
Petr Pravec Petr Pravec (born September 17, 1967) is a Czech astronomer and a discoverer of minor planets, born in Třinec, Czech Republic. Pravec is a prolific discoverer of binary asteroids, expert in photometric observations and rotational lightcurves ...
's revised WISE-data, that is, an albedo of 0.0747 and a diameter of 54.56 kilometers based on an absolute magnitude of 9.75.


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 from
Greek mythology Greek mythology is the body of myths originally told by the Ancient Greece, ancient Greeks, and a genre of ancient Greek folklore, today absorbed alongside Roman mythology into the broader designation of classical mythology. These stories conc ...
after
Queen Rhodope In ancient Greek and Roman mythology, Rhodope () is the wife of Haemus and queen of Thrace. She and her husband were punished together by being transformed into mountain ranges after daring to compare themselves to Zeus and Hera, the highest g ...
of
Thrace Thrace (, ; ; ; ) is a geographical and historical region in Southeast Europe roughly corresponding to the province of Thrace in the Roman Empire. Bounded by the Balkan Mountains to the north, the Aegean Sea to the south, and the Black Se ...
, wife of King
Haemus In Greek mythology, King Haemus (; , ''Haîmos'') of Thrace, was the son of Boreas, the north wind. Mythology Haemus was vain and haughty and compared himself and his wife, Queen Rhodope, to Zeus and Hera. The gods changed him and his wife in ...
and attendant of
Artemis In ancient Greek religion and Greek mythology, mythology, Artemis (; ) is the goddess of the hunting, hunt, the wilderness, wild animals, transitions, nature, vegetation, childbirth, Kourotrophos, care of children, and chastity. In later tim ...
, ''also see ''. In vanity, Rhodope and Haemus compared themselves to the gods
Zeus Zeus (, ) is the chief deity of the List of Greek deities, Greek pantheon. He is a sky father, sky and thunder god in ancient Greek religion and Greek mythology, mythology, who rules as king of the gods on Mount Olympus. Zeus is the child ...
and
Hera In ancient Greek religion, Hera (; ; in Ionic Greek, Ionic and Homeric Greek) is the goddess of marriage, women, and family, and the protector of women during childbirth. In Greek mythology, she is queen of the twelve Olympians and Mount Oly ...
, ''see and '', who punished the couple by changing them into the
Rhodope Mountains The Rhodopes (; , ; , ''Rodopi''; ) are a mountain range in Southeastern Europe, and the largest by area in Bulgaria, with over 83% of its area in the southern part of the country and the remainder in Greece. Golyam Perelik is its highest peak ...
and
Balkan Mountains The Balkan mountain range is located in the eastern part of the Balkan peninsula in Southeast Europe, Southeastern Europe. It is conventionally taken to begin at the peak of Vrashka Chuka on the border between Bulgaria and Serbia. It then runs f ...
, respectively.


Notes


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:Rhodope 000166 Discoveries by Christian Peters Named minor planets 000166 000166 18760815