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90 Antiope (an-tye'-a-pee) is an asteroid discovered on October 1, 1866 by Robert Luther. The 90th asteroid to be discovered, it is named after a character in Greek Mythology, called Antiope, though it is disputed as to which, there being more than one. © This image is copyrighted. ...
In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ...
The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ...
The Themis Asteroid Family The Themis Asteroid Family is a Hirayama family of asteroids found in the outer portion of the main asteroid belt, between the orbits of Mars and Jupiter. ...
In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ...
The astronomical unit (AU or au or a. ...
This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ...
The astronomical unit (AU or au or a. ...
This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ...
The astronomical unit (AU or au or a. ...
The orbital period is the time it takes a planet (or another object) to make one full orbit. ...
A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
Inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit and is the angular distance of the orbital plane from the plane of the reference (usually planets equator or the ecliptic), stated in degrees. ...
(This page refers to eccitricity in astrodynamics. ...
For the geometric term, see diameter. ...
A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ...
In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ...
The hour was originally defined in Egypt as 1/24 of a day, based on their duo-decimal numbering system (which counted finger joints on each hand). ...
In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore always keeps the same hemisphere pointed at the body it is orbiting. ...
An asteroid is a small, solid object in our Solar System, orbiting the Sun. ...
C-type asteroids are carbonaceous asteroids. ...
In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standardized distance away. ...
The albedo is a measure of reflectivity of a surface or body. ...
Karl Theodor Robert Luther (April 16, 1822 – February 15, 1900) was a German astronomer who searched for asteroids while working in Düsseldorf. ...
1866 is a common year starting on Monday. ...
An asteroid is a small, solid object in our Solar System, orbiting the Sun. ...
October 1 is the 274th day of the year (275th in Leap years). ...
1866 is a common year starting on Monday. ...
Karl Theodor Robert Luther (April 16, 1822 – February 15, 1900) was a German astronomer who searched for asteroids while working in Düsseldorf. ...
Greek mythology comprises the collected legends of Greek gods and goddesses and ancient heroes and heroines, originally created and spread within an oral-poetic tradition. ...
Antiope is the name of at least two characters in Greek mythology. ...
Antiope is classified as a member of the Themis family of asteroids. Minor planet is the official term for asteroids and trans-Neptunian objects. ...
The Themis Asteroid Family The Themis Asteroid Family is a Hirayama family of asteroids found in the outer portion of the main asteroid belt, between the orbits of Mars and Jupiter. ...
One observed stellar occultation by Antiope has been reported, on (June 11, 1980). The Pleiades star cluster A star is any massive gaseous body in outer space just like the Sun. ...
In Islam the occulation is the name given to the disappearance of the Twelfth Imam. ...
June 11 is the 162nd day of the year in the Gregorian Calendar (163rd in leap years), with 203 days remaining. ...
1980 is a leap year starting on Tuesday. ...
In 2000, using adaptive optics at the Keck Telescope on Mauna Kea it was discovered that Antiope is in fact a double asteroid, consisting of two individual bodies separated by 170 kilometers, orbiting around a common center. Additional studies by lightcurve variation and adaptive optics at ESO-VLT indicate that the lobes, approximated to a 80 kilometers diameter sphere, revolve around the center of mass in ~16.5 hours. Using the 3rd Kepler's law, the mass and density of the components can be derived. The relatively low density (0.6 ± 0.2 g/cm3) suggests a high porosity (>60%). Their composition is C-type, which means that they are dark in colouring with a carbonate composition. 2000 is a leap year starting on Saturday of the Gregorian calendar. ...
Adaptive optics is a technology to improve the performance of reflecting telescopes by reducing the effects of atmospheric distortion, or twinkling. ...
The Mauna Kea Observatory, an institute of the University of Hawaii, is considered one of the most important land-based observatories in the world for its isolated, unobstructed views of space without interference from man-made light sources. ...
Mauna Kea is a dormant volcano in the Hawaiian Islands, one of five volcanic peaks that together form the Island of Hawaii. ...
The term binary asteroid refers to a system in which two asteroids orbit their common centre of gravity, in analogy with binary stars. ...
Adaptive optics is a technology to improve the performance of reflecting telescopes by reducing the effects of atmospheric distortion, or twinkling. ...
The European Southern Observatory (ESO) is an international astronomical organisation, composed and supported by ten countries from the European Union plus Switzerland and was created in 1962. ...
The four telescopes of the European Southern Observatory Paranal site. ...
A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ...
Johannes Kepler Johannes Kepler (December 27, 1571 – November 15, 1630), a key figure in the scientific revolution, was a German astronomer, mathematician and astrologer. ...
Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ...
In geology, the porosity of a rock or sediment is the proportion of the non-solid volume to the total volume of material, and is defined by the ratio: where Vp is the non-solid volume (pores and liquid) and Vm is the total volume of material, including the solid...
C-type asteroids are carbonaceous asteroids. ...
Carbonate is an anion with a charge of -2 and an empirical formula of CO32-. An aqueous solution of carbon dioxide contains a minute amount of H2CO3, called carbonic acid, which dissociates to form hydrogen ions and carbonate ions. ...
External links
89 Julia is a large main belt asteroid. ...
91 Aegina is a large main belt asteroid. ...
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