Adrastea

This image of Adrastea was taken by Galileo's solid state imaging system between November 1996 and June 1997.
Discovery
Discovered by	David C. Jewitt G. Edward Danielson
Discovered on	July 8, 1979
Orbital characteristics
Mean radius	128,694 km (0.000860 AU)
Eccentricity	0.0018
Periastron	128,460 km (0.000859 AU)
Apastron	128,930 km (0.000862 AU)
Revolution period	0.29826 d (7 h 9.5 min)
Orbital circumference	808,600 km (0.005 AU)
Orbital velocity	max: 31.435 km/s mean: 31.378 km/s min: 31.322 km/s
Inclination	2.22° (to the ecliptic) 0.00° (to Jupiter's equator)
Is a satellite of	Jupiter
Physical characteristics
Mean diameter	20 km (26×20×16 km)
Surface area	~5300 km2
Volume	~4400 km3
Mass	7.5×1015 kg
Mean density	3.0 g/cm3
Surface gravity	0.0066 m/s2 (0.001 g)
Escape velocity	0.011 km/s
Rotation period	synchronous
Rotation velocity	11 km/h
Axial tilt	zero
Albedo	0.10
Surface temp.	min mean max K ~122 K K
Atmospheric pressure	0 kPa

Adrastea (IPA: /ˌædrəˈstiə/, ad'-ra-stee'-a, Greek Αδράστεια) is the second of Jupiter's known moons (counting outward from the planet). It was discovered on Voyager 2 probe photographs taken in 1979 and received the designation S/1979 J 1 (IAUC 3454) after the discovery had been announced in Science (vol. 206, p. 951, November 23, 1979). In 1983 it was officially named after the mythological Adrastea, daughter of Jupiter and Ananke. It is also known as Jupiter XV. Adrastea - the moon of Jupiter File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Galileo being deployed after being launched by the Space Shuttle Atlantis on the STS-34 mission Galileo was an unmanned spacecraft sent by NASA to study the planet Jupiter and its moons. ... 1996 is a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... 1997 is a common year starting on Wednesday of the Gregorian calendar. ... David C. Jewitt is a Professor of astronomy at the University of Hawaii Institute for Astronomy. ... July 8 is the 189th day of the year (190th in leap years) in the Gregorian Calendar, with 176 days remaining. ... This page refers to the year 1979. ... 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. ... In classical geometry, a radius of a circle or sphere is any line segment with one endpoint on the circle (i. ... 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). ... The astronomical unit (AU or au or a. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... 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). ... 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. ... 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). ... 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. ... The circumference is the distance around a closed curve. ... // Basic explanation The velocity of an object is simply its speed in a particular direction. ... 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. ... The plane of the Ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... Moons of solar system scaled to Earths Moon The common noun moon (not capitalized) is used to mean any natural satellite of the other planets. ... Genitive Jovian Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... For the geometric term, see diameter. ... This article explains the meaning of area as a physical quantity. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ... Volume, also called capacity, is a quantification of how much space an object occupies. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ... Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... It has been suggested that Law of universal gravitation be merged into this article or section. ... Acceleration is the time rate of change of velocity, and at any point on a v-t graph, it is given by the gradient of the tangent to that point In physics, acceleration (symbol: a) is defined as the rate of change (or time derivative) of velocity. ... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... 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. ... Rotation is the movement of a body in such a way that the distance between a certain fixed point and any given point of that body remains constant. ... Axial tilt is an astronomical term regarding the inclination angle of a planets rotational axis in relation to its orbital plane. ... The albedo is a measure of reflectivity of a surface or body. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... The title of this article is incorrect due to technical limitations. ... diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure above any area in the Earths atmosphere caused by the weight of air. ... The pascal (symbol Pa) is the SI unit of pressure. ... The International Phonetic Alphabet. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... Moons of solar system scaled to Earths Moon The common noun moon (not capitalized) is used to mean any natural satellite of the other planets. ... The Voyager 2 spacecraft was launched in 1977, originally planned as Mariner 12 of the Mariner program. ... This page refers to the year 1979. ... 1983 is a common year starting on Saturday of the Gregorian calendar. ... A goddess in Greek mythology and a daughter of Zeus, Adrasteia (inescapable) was also an epithet applied to Rhea, Cybele, Nemesis and Ananke. ... Jupiter In Roman mythology, Jupiter (sometimes shortened to Jove) held the same role as Zeus in the Greek pantheon. ... In Greek mythology, Ananke (Greek ) was was the personification of destiny, unalterable necessity and fate. ...

It is the smallest of the inner satellites of Jupiter. The inner satellites of Jupiter are four small moons that orbit close to Jupiter, merging with its planetary ring. ...

Adrastea is inside Jupiter's planetary ring and may be the source of some of its material. Its orbit lies inside Jupiter's synchronous orbit radius, and as a result tidal forces are slowly causing its orbit to decay. It is also within Jupiter's Roche limit, but is small enough to avoid tidal disruption. A planetary ring is a ring of dust and other small particles orbiting around a planet in a flat disc-shaped region. ... The Roche limit is the distance within which a celestial body held together only by its own gravity will disintegrate due to a second celestial bodys tidal forces exceeding the first bodys gravitational self-attraction. ...

Discovery image of Adrastea, taken on July 8, 1979 by Voyager 2. Adrastea is the dot in the very middle, straddling the line of the Jovian rings.

Image File history File links Discovery image (FDS 20630. ... Image File history File links Discovery image (FDS 20630. ... July 8 is the 189th day of the year (190th in leap years) in the Gregorian Calendar, with 176 days remaining. ... This page refers to the year 1979. ...

Atmospheric pressure 0 kPa Metis (IPA: , mee-tis, Greek Μήτις) is the innermost member of the Jupiters small inner moons. ... Atmospheric pressure 0 kPa Amalthea (IPA: , am-ul-thee-a, Greek Αμάλθεια) is the third moon of Jupiter (in order of distance from the planet), and the fifth in order of discovery, hence its Roman numeral designation of Jupiter V. It was discovered on September 9, 1892 by Edward Emerson Barnard...