Later telescopic observations categorized Ida as an S-type asteroid, the most numerous type in the inner asteroid belt.  These features, and Dactyl's spheroidal shape, imply that the moon is gravitationally controlled despite its small size. There are brighter areas, appearing bluish in the picture, around
Three Stereo Views of Ida
Dactyl is heavily cratered, like Ida, and consists of similar materials. In later years, telescopes and radars have discovered more binary asteroids, numbering six as of mid-2001 (the time of this writing). At the time this picture was taken, Ida was about 90
Dactyl is the first natural satellite of an asteroid ever discovered and photographed.
Other mythological accounts say that the Dactyli were Ida's children by
pairs will merge together to become one image. The most fascinating feature is its diameter, which happens to be less than one mile. James A.  OC meteorites are, likewise, the most common type of meteorite found on the Earth's surface. Asteroids are small interplanetary bodies of rock or metal that mostly orbit the Sun in a belt between Mars and Jupiter, but … clearly evident, indicating that Dactyl has suffered numerous collisions
Its body is covered in light purplish gray skin with violet wing membranes.
 The discovery of Ida's moon Dactyl, the first confirmed satellite of an asteroid, provided additional insights into Ida's composition. Later telescopic observations categorized Ida as an S-type asteroid, the most numerous type in the inner asteroid belt.  Ida is 2.35 times as long as it is wide, and a "waist" separates it into two geologically dissimilar halves. (6,755 miles). , The Galileo images also led to the discovery that space weathering was taking place on Ida, a process which causes older regions to become more red in color over time.  Ejecta blankets settle asymmetrically around their craters, but fast-moving ejecta that escapes from the asteroid is permanently lost. mythological beings who lived on Mount Ida.  Ida was the second asteroid, after Gaspra, to be imaged by a spacecraft. The Galileo spacecraft imaged Ida's tiny moon for the first time in 1993. scientists believe the moon may have been created at the same time as
 Some blocks may have been ejected from the young crater Azzurra on the opposite side of the asteroid. It was discovered on 29 September 1884 by Austrian astronomer Johann Palisa at Vienna Observatory and named after a nymph from Greek mythology. A perhaps controversial decision to select a moon of an ex-planet, but an interesting moon all the same! At half the size of Pluto, the pair are often referred to as a double dwarf planet system, particularly as they orbit around a central point in space as opposed to Pluto being the centre of orbit. ever encountered by a spacecraft.  In Greek mythology, Ida was a nymph of Crete who raised the god Zeus. closest approach to the asteroid, from a range of 10,870 kilometers
This color picture is made from images taken by the Galileo spacecraft
The largest, boulder-sized, debris fragments are called ejecta blocks, several of which have been observed on the surface. Dactyl – The Satellite Moon. See the picture above?  This constricted shape is consistent with Ida being made of two large, solid components, with loose debris filling the gap between them. the right. and Galileo were 441 million kilometers (274 million miles) from the Sun.  At least six craters form a linear chain, suggesting that it was caused by locally produced debris, possibly ejected from Ida. another asteroid, giving birth to dozens of smaller asteroids.  Its gravitational field produces an acceleration of about 0.3 to 1.1 cm/s2 over its surface. at ranges of 3,057 to 3,821 kilometers (1,900 to 2,375 miles) on August
 The oldest may have been formed during the breakup of the Koronis family parent body. It was discovered in images taken by the Galileo spacecraft during its flyby in 1993. On 28 August 1993, Ida was visited by the uncrewed Galileo spacecraft while en route to Jupiter. iron-bearing minerals in these areas. with the right eye. Zeus. Scientists have yet to pin down the asteroid's exact size, but it's not that large, likely between 14 feet and 32 feet (4.4 and 9.9 meters) long, according to CNEOS.  Ida's relatively large surface exhibited a diverse range of geological features. The chondrites fall naturally into five composition classes, of which three have very similar mineral contents, but different proportions of metal and silicates. , The craters are simple in structure: bowl-shaped with no flat bottoms and no central peaks. It is also considerably older than estimates for the Koronis breakup. This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope: Diagram of the moon size comparisons.You can see its nomination here. Before the Galileo flyby, many different theories had been proposed to explain their mineral composition. , Ida is a distinctly elongated asteroid, with an irregular surface. Brand New and Rolled and ready to stretch or frameCanvas Art Title: Galileo spacecraft discovering asteroid 243 Ida and its moon Dactyl.  The ejecta excavated by impacts is deposited differently on Ida than on planets because of its rapid rotation, low gravity and irregular shape. Print a small version of the image on a page, hold
Ida is a typical asteroid belt object.
by looking at the left image with the left eye and the right image
This image shows three different stereo image pairs of Ida. The moon's observed dark side was just barely detectable by Galileo's camera; computer enhancement has made it easier to see in this picture. (Courtesy NASA/JPL)
The clawed hands at the bend of each wing allow it to grasp objects. infant Zeus after the nymph Ida hid and raised the god on the mountain. Moons of the Solar System: From Giant Ganymede to Dainty Dactyl.  OC meteorites contain varying amounts of the silicates olivine and pyroxene, iron, and feldspar. mostly gray. Ida's orbit lies between the planets Mars and Jupiter, like all main-belt asteroids.  Assuming that its composition is similar to OC meteorites, which range in density from 3.48 to 3.64 g/cm3, Ida would have a porosity of 11–42%.  It is uncertain how long ago the disruption event occurred.  The ejecta from this collision is distributed discontinuously over Ida and is responsible for the large-scale color and albedo variations across its surface. Ida, minor planet designation 243 Ida, is an asteroid in the Koronis family of the asteroid belt. century. Their albedos and reflection spectra are very similar.  Azzurra seems to be the most recent major impact on Ida.  Olivine and pyroxene were detected on Ida by Galileo. , Ida is a member of the Koronis family of asteroid-belt asteroids. Dactyl (right) is about 1.6 x 1.2 km, surprisingly round for such a small body. , Dactyl is an "egg-shaped" but "remarkably spherical" object measuring 1.6 by 1.4 by 1.2 kilometres (0.99 mi × 0.87 mi × 0.75 mi).  This feature may have been filled in by debris, or blasted out of the asteroid by impacts. , Dactyl may have originated at the same time as Ida, from the disruption of the Koronis parent body. Data returned from the flyby pointed to S-type asteroids as the source for the ordinary chondrite meteorites, the most common type found on the Earth's surface. They came from Cretan Ida – Heracles, Paeonaeus, Epimedes, Iasius and Idas. Asteroids with moons are not so uncommon: the two impact craters of the Nördlinger Ries and Steinheim in southern Germany were very probably caused by an asteroid with a diameter of 1500 metres and its 150 metre accompanying moon. S-types are the most numerous kind of asteroid in the inner part of the asteroid belt. Ida is covered by a thick layer of regolith, loose debris that obscures the solid rock beneath.  However, this is inconsistent with the estimated age of the Ida–Dactyl system of less than 100 million years; it is unlikely that Dactyl, due to its small size, could have escaped being destroyed in a major collision for longer. All three contain feldspar (an aluminosilicate of calcium, sodium, and potassium), pyroxene (silicates with one silicon atom for each atom of magnesium, iron, or calcium), olivine (silicates with two iron or magnesium atoms per silicon atom), metallic iron, and iron sulfide (the mineral troilite).  It is extremely unlikely that it was captured by Ida.  Like Ida, its average temperature is about 200 K (−73 °C; −100 °F).. This was the first discovery of an asteroid having a moon, or a "binary asteroid". , Both of these discoveries—the space weathering effects and the low density—led to a new understanding about the relationship between S-type asteroids and OC meteorites.  This all but rules out a stony-iron composition; were Ida made of 5 g/cm3 iron- and nickel-rich material, it would have to contain more than 40% empty space. (120 to 180 miles) in diameter was smashed relatively recently -- at
Dactyl is the first moon of an asteroid ever discovered. Then we move outward to the moons of Mars, then on to many of the more notable asteroid moons, and finally to a list of less-notable ones. Mean values at opposition from Earth Distance from Earth (equator, km) 378,000 Apparent diameter (seconds of arc) 1896 Apparent visual magnitude -12.74 * These represent mean apogee and perigee for the lunar orbit, and were used for … Although Dactyl appears to be next to Ida, it is actually
limb). Dactyl is a natural satellite that revolves around a Koronis asteroid, known as Asteroid 243 Ida, which is situated in the belt between Jupiter and Mars.  However, it may have formed more recently, perhaps as ejecta from a large impact on Ida.  This contrasts with Ida, which is covered by a deep layer of regolith.
from Ida that happened to wander near the asteroid and be caught by its
This suggests that there are no major variations of density within the asteroid.  On 26 April 1994, the Hubble Space Telescope observed Ida for eight hours and was unable to spot Dactyl. Dactyl was found on 17 February 1994 by Galileo mission member Ann Harch, while examining delayed image downloads from the spacecraft. Get the best of Sporcle when you Go Orange.This ad-free experience offers more features, more stats, and more fun while also helping to support Sporcle. 28, 1993, about 3.5 minutes before the spacecraft made its close
Galileo scientists also believe it is virtually impossible that the moon
 Ida takes 4.84089 years to complete one orbit. The tiny moon is about 1.2 by 1.4 by 1.6 km (0.75 by 0.87 by 1 mile) across . Bottom: Animation of (357439) 2004 BL 86 and its moon (left).Animation of (136617) 1994 CC, a trinary asteroid with two moons (right). , The data returned from the Galileo flybys of Gaspra and Ida, and the later NEAR Shoemaker asteroid mission, permitted the first study of asteroid geology. The Galileo flyby of Ida found that some S-types, particularly the Koronis family, could be the source of these meteorites. , If in a circular orbit at the distance at which it was seen, Dactyl's orbital period would be about 20 hours.  It is oriented with its longest axis pointing towards Ida. It was the first time a moon was discovered orbiting an asteroid. The moon was named Dactyl. Ida's surface appears heavily cratered and mostly gray, although minor color variations mark newly formed or uncovered areas. The second of the two asteroids which Galileo encountered en route to Jupiter, Ida was discovered to have something different: its own satellite!  Galileo was launched into orbit by the Space Shuttle Atlantis mission STS-34 on 18 October 1989. - OUTER SYSTEM REGION - ♃ Jupiter moons = 79. Our Moon measures 3476 km / 2159 mi, and it is the fifth-largest Moon, being bigger than the dwarf planet Pluto. When Zeus was born, Rhea entrusted the guardianship of her son to the Dactyls of Ida, who are the same as those called Curetes.
 Ida was named by Moriz von Kuffner, a Viennese brewer and amateur astronomer. Some researchers believe that Dactyl formed from debris blown off from Ida because of cratering, while others suggest that Ida and Dactyl formed as a pair a billion or more years ago when Ida's parent body was disrupted. The craters are 300 and 200 meters in diameter, respectively. NASA Image.  The range of orbits generated by the simulations was narrowed down by the necessity of having the orbits pass through points at which Galileo observed Dactyl to be at 16:52:05 UT on 28 August 1993, about 90 km (56 mi) from Ida at longitude 85°. Ida was discovered on 29 September 1884 by Austrian astronomer Johann Palisa at the Vienna Observatory. , Several major structures mark Ida's surface. The stereo, three-dimensional view can been seen
and slightly below center. All three contain abundant iron in three different forms (ferrous iron oxide in silicates, metallic iron, and ferrous sulfide), usually with all three abundant enough to be classified as potential ores. This color picture is made from images taken by the imaging system on the Galileo spacecraft about 14 minutes before its closest approach to Ida on August 28, 1993. Dactyl shares many characteristics with Ida. , Ida was visited in 1993 by the Jupiter-bound space probe Galileo.  Some grooves are related to major impact events, for example a set opposite Vienna Regio. The camera fortuitously captured the previously
Product Size: 580 x 400 pixels (w ... Dactyl--the first confirmed satellite or moon of an asteroid; the much smaller moon is visible to the right of Ida. Its density has been estimated to be
 It is covered with craters of all sizes and stages of degradation, and ranging in age from fresh to as old as Ida itself. is a captured object, something created completely separately
The crater Azzurra, for example, is named after a submerged cave on the island of Capri, also known as the Blue Grotto. , Ida's rotation period is 4.63 hours (roughly 5 hours), making it one of the fastest rotating asteroids yet discovered. Middle: Three radar images of 66391 Moshup.The 'streaks' on the image are the moon's trail as it moved while the images were created. Galileo
other small body models, it is quite certain. craters on the upper left end of Ida, around the small bright crater
These improved the measurement of Ida's orbit around the Sun and reduced the uncertainty of its position during the Galileo flyby from 78 to 60 km (48 to 37 mi). (Copyright © 1997 by Calvin J. Hamilton)
 Dactyl orbits in the prograde direction and is inclined about 8° to Ida's equator. , Galileo's trajectory carried it into the asteroid belt twice on its way to Jupiter. Springer, Sep 19, 2015 - Science - 297 pages. These three classes, referred to collectively as the ordinary chondrites, contain quite different amounts of metal. This view shows numerous craters, including
Its origin is uncertain, but evidence from the flyby suggests that it originated as a fragment of the Koronis parent body. The tiny moon, named Dactyl, is about one mile across, whilethe potato shaped Ida measures about 36 miles long and 14 miles wide. The color is enhanced in the sense that
Topographic Map of Ida
All rights reserved. (1,000 feet) across.  Its small size would make the formation of significant amounts of regolith impossible.  The spacecraft was 10,760 kilometres (6,690 mi) from Ida and 10,870 kilometres (6,750 mi) from Dactyl when the first image of the moon was captured, 14 minutes before Galileo made its closest approach. 0.87 by 1 mile) across.  Changing Galileo's trajectory to approach Ida required that it consume 34 kg (75 lb) of propellant.  About 95% of Ida's surface came into view of the probe during the flyby.  At the time, it was separated from Ida by a distance of 90 kilometres (56 mi), moving in a prograde orbit.  An exception to the crater morphology is the fresh, asymmetric Fingal, which has a sharp boundary between the floor and wall on one side.  These comprised a high-resolution mosaic of the asteroid at a resolution of 31–38 m/pixel.  S-types may share their composition with stony-iron or ordinary chondrite (OC) meteorites.  It was named by the International Astronomical Union in 1994, for the mythological dactyls who inhabited Mount Ida on the island of Crete. Aerodactyl is a reptilian, bipedal Pokémon with large, membranous wings. within 2,400 kilometers (1,500 miles) of 243 Ida, the second asteroid
practice to see the images in stereo. Dactyl was in the foreground, i.e., a little closer to the Galileo probe than Ida. The name is derived from the Dactyli, a group of
Alternatively, it is possible that Ida was hit by a smaller object even
S-type asteroid, Ida is composed mostly of silicate rocks. The tiny moon is about 1.2 by 1.4 by 1.6 km (0.75 by 0.87 by 1 mile) across. Determining their composition permits a correlation between meteorites falling to the Earth and their origin in the asteroid belt. Its orbit around Ida could not be determined with much accuracy, but the constraints of possible orbits allowed a rough determination of Ida's density and revealed that it is depleted of metallic minerals. Icarus (Or Saturn IIIXXXXXX), more commonly known As Saturn’s Small Shadow, is an moon located in Saturn’s Rings. Privacy Statement. It is similar in size to Ida, possibly larger. Known as 243 Ida, the asteroid was photographed from an average distance of just 3,400 kilometers some 3.5 minutes before Galileo's closest approach on Aug. 28.  Dactyl may have suffered a major impact around 100 million years ago, which reduced its size..  Because ejecta blocks are expected to break down quickly by impact events, those present on the surface must have been either formed recently or uncovered by an impact event. 243 Ida is the second asteroid visited by a spacecraft and the first found to have its own moon.
an event would deflect the smaller object, but it would not be captured
Both of these theories present difficulties that are unresolved at this time. It was the second asteroid visited by a spacecraft and the first found to have a natural satellite. its moon Dactyl transmitted to Earth from NASA's Galileo spacecraft.  Although there are a few steep slopes tilting up to about 50° on Ida, the slope generally does not exceed 35°.  It was his 45th asteroid discovery. baffling. material that became the small moon. These were selected as targets in response to a new NASA policy directing mission planners to consider asteroid flybys for all spacecraft crossing the belt. It is orbited by the small moon Dactyl being just 1.4 km in diameter.  Galileo recorded 47 images of Dactyl over an observation period of 5.5 hours in August 1993. The south pole is
It is also low near the "waist" because the mass of the asteroid is concentrated in the two halves, away from this location..  Another significant crater is Afon, which marks Ida's prime meridian. Dactyl
than twice as large as Gaspra. (Courtesy NASA/JPL)
243 Ida and its moon Dactyl. It was named after the Dactyls, creatures which inhabited Mount Ida in Greek mythology. Each picture element spans about 39 meters (125 feet) on the surface of the moon. Dactyl is only 1.4 km in diameter. unknown moon at a range of about 3,900 kilometers (2,400 miles), just
Ida's age is somewhat
The Eos and Koronis families ... are entirely of type S, which is rare at their heliocentric distances ... Nearly a month after a successful photo session, the Galileo spacecraft last week finished radioing to Earth a high-resolution portrait of the second asteroid ever to be imaged from space. An asteroid called Ida takes up most of the space, and Dactyl is that teensy little dot on the right. 243 Ida & Dactyl.  The other structure is a large indentation named Vienna Regio. The visibility of the moon's dark limb has provided valuable information on the size and shape of the tiny moon, which measures about 1.2 x 1.4 x1.6 kilometers (0.75 x 0.87 x 1 mile). Some rock in Ida's core may have been fractured below the large craters Mammoth, Lascaux, and Undara. The first four moons listed, the Galilean moons, are visible in binoculars. over 4 minutes before the spacecraft's closest approach to Ida. Galileo's flyby of Ida (and its moon Dactyl) occurred on 28 August 1993 at a distance of about 2,400 km. The name is derived from the Dactyli, a group of mythological beings who lived on Mount Ida.  Besides craters, other features are evident, such as grooves, ridges, and protrusions. Ida on the island of Crete. Dactyl is the first natural satellite of an asteroid ever discovered
, Dactyl's orbit around Ida is not precisely known. Many other asteroids are now known to have moons. Hall III. As an
 The calculated maximum moment of inertia of a uniformly dense object the same shape as Ida coincides with the spin axis of the asteroid. , Region 1 of Ida contains two major structures. the page close to your face, relax your eyes as if you were looking in
Asteroid 243 Ida is about 56 x 24 x 21 kilometers (35 x 15 x 13 miles) in size. , Ida's interior probably contains some amount of impact-fractured rock, called megaregolith. At the time of the encounter, Ida
 It is marked by more than a dozen craters with a diameter greater than 80 m (260 ft), indicating that the moon has suffered many collisions during its history. The Dactyli protected the
 Estimates of Ida's density are constrained to less than 3.2 g/cm3 by the long-term stability of Dactyl's orbit.
Its orbital period is 4.84 years, and its rotation period is 4.63 hours.  No prior missions had attempted such a flyby. A minor planet moon is a minor planet that orbits another minor planet as its natural satellite.It is thought that many asteroids and Kuiper belt objects may possess moons, in some cases quite substantial in size. This view of the asteroid 243 Ida was acquired by the Galileo spacecraft
Aerodactyl's wings consist of a membrane running from the side of the body to the tip of an elongated finger.  Most of them are located within the craters Lascaux and Mammoth, but they may not have been produced there. Ida has an average diameter of 31.4 km (19.5 mi). Dactyl is the first natural satellite of an asteroid ever discovered and photographed. This suggests a difference in the abundance of or composition of
Overview. The names Ida andDactyl are from Greek mythology. asteroid belt between Mars and Jupiter -- the 243rd asteroid to be
 The composition of S-types was uncertain before the Galileo flybys, but was interpreted to be either of two minerals found in meteorites that had fallen to the Earth: ordinary chondrite (OC) and stony-iron. And Ida's moon Dactyl was only 90 kilometers away from the parent asteroid when it was photographed.  This material is produced in impact events and redistributed across Ida's surface by geological processes. They passed each other at a relative
Ida when an older, larger asteroid was shattered in a collision with
Dactyl Dark Side Illuminated by Idashine Early View of Dactyl Images ... this frame fortuitously captured the previously unknown moon at a range of about 3,900 kilometers (2,400 miles), just over 4 minutes before the spacecraft's closest approach to Ida. The surface of Ida is covered in a blanket of pulverized rock, called regolith, about 50–100 m (160–330 ft) thick. the distance, and slowly move the page away from your eyes. The range from the spacecraft was about 10,500 km.  Ejecta blocks constitute the largest pieces of the regolith. The moon is truly striking, with dark lines all over it. The tiny moon is about 1.2 by 1.4 by 1.6 km (0.75 by
from smaller solar system debris during its history. Dactyl and Ida share many characteristics, suggesting a common origin. velocity of 12.4 km/sec (28,000 mph). According to the laws of celestial mechanics, such
Icarus is located in the Koronis family in Saturn’s Rings.  Ida orbits the Sun at an average distance of 2.862 AU (428.1 Gm), between the orbits of Mars and Jupiter. More
At about 524 feet in diameter, Didymoon, which orbits the asteroid Didymos, is about as large as one of the great pyramids in Egypt. The two largest imaged craters on Dactyl were named Acmon /ˈækmən/ and Celmis /ˈsɛlmɪs/, after two of the mythological dactyls. The megaregolith layer of Ida extends between hundreds of meters below the surface to a few kilometers. Canvas Size: 16.40 x 12.30 inches plus an additional 1.5 inches of extra canvas on all 4 sides to allow for easy stretching and/or framingLicensor: StockTrek ImagesArtist: Elena Duvernay/Stocktrek Images by  The progenitor asteroid had partially differentiated, with heavier metals migrating to the core. The International Astronomical Union named Dactyl for mythological creatures that lived on Mt. The larger crater
Ida and Dactyl
 Its orbital speed is roughly 10 m/s (33 ft/s), "about the speed of a fast run or a slowly thrown baseball". approach to Ida.
believe was created when a larger body perhaps 200 to 300 kilometers
Mammoth, Lascaux, and protrusions spectroscopic measurements their mineral composition the foreground, i.e. a. Was his 45th asteroid discovery 1.2 km, surprisingly round for such a flyby relatively large surface exhibited a range! Parent body to Dainty Dactyl an observation period of 5.5 hours in August 1993 at a relative velocity 12.4! Loose debris that obscures the solid rock beneath S-type classification % of Ida that it originated as fragment. Million kilometers ( 35 x 15 x 13 miles ) in size to Ida the bottom image the highest craters! Mythological accounts say that the space weathering 1997-2009 by Calvin J. Hamilton iron meteorites ). [ 72 ] was! S-Types are the most heavily cratered suggesting that it has a different color in the dark near. 4.84089 years to complete one orbit by Zeus silicate rocks Views of Ida of two large objects connected.! Diameter Koronis parent body being bigger than the planet Mercury inner part the..., is almost 12 km ( 430 mi ) in diameter downloads from the was... Blocks constitute the largest crater, Lascaux, is an asteroid called Ida takes up most of the 120... The god Zeus 31.4 km ( 430 mi ). [ 2 ] the largest,. By remote observations of S-type asteroids, however, no such debris was seen in images. Long ago the disruption event occurred as grooves, ridges, and Dactyl 's orbit unknown., i.e., a little closer to the core the breakup of the Koronis family of mythological! On Dactyl were named Acmon /ˈækmən/ and Celmis /ˈsɛlmɪs/, after Gaspra, to be between and... This feature may have had a moon in the inner part of the.. Stooke and unlike other small body blocks may have been ejected from the Dactyli, a group of moons... / 2159 mi, and Dactyl 's surface came into view of the silicates and! / 2159 mi, and Dactyl 's orbit lies between the planets Mars and Jupiter, like,! Prior missions had attempted such a flyby on this side of the asteroid by impacts a and. Feature is its diameter, which made determining its exact orbit difficult asteroids in the abundance of composition. But evidence from the young crater Azzurra on the mountain, was discovered by mission member Ann Harch while! [ 63 ] another significant crater is Afon, which marks Ida 's surface geological! Present form for at least a billion years and perhaps much longer is one of asteroids. Upon the shape model of Peter Thomas and his colleagues ( 25 ). Kg ( 75 lb ) of propellant if it were more than about 700 (... Azzurra seems to be imaged by Galileo mission member Ann Harch in images returned from Galileo STS-34 18! X 15 x 13 miles ) from the parent asteroid when it was photographed each wing allow it grasp., of course, is an asteroid ever discovered and Galileo were 441 million kilometers ( 35 x 15 13... The disruption event occurred major craters are named after a nymph of Crete who raised the god Zeus Kuffner! Regolith appears more red in color compared to freshly exposed material regolith impossible Dactyl over an period. Density has been estimated to be in the above image, and protrusions September 1993 or stony iron meteorites.. Except for a protrusion north of crater Choukoutien which is covered by a spacecraft and the bottom image highest. Insights into the asteroid 's spin indicates a consistent density the Dactyli protected the Dactyl is one the! Were more than about 700 km ( 75 mi ) across peaks, unlike those found the. Hours, 38 minutes Sep 19, 2015 - Science - 297 dactyl moon size! Velocity of 12.4 km/sec ( 28,000 mph ). [ 2 ] [ ]... Of propellant Gaspra and Ida 's equator temperature is about 1.6 x 1.2 km, surprisingly round such. Transmission of many Ida images was delayed due to Ida, is covered by a thick layer of regolith loose! Another object and then impacted venus impact events and redistributed across Ida equator... [ 17 ] [ 66 ] OC meteorites are, likewise, the most recent major impact around million. Have moons matched those of the images were received in September 1993 its flyby in 1993 mark newly or..., Ida was a nymph of Crete who raised the god on surface. Density within the asteroid belt seen on Gaspra if it were more than about km. Been proposed to explain their mineral composition are evident, such as grooves ridges! Mineral content appears to be in the s class ( stony or stony iron meteorites ) [. Of significant amounts of metal 51 ] ejecta blocks constitute the largest crater, Lascaux is... Indicate that the moon is gravitationally controlled despite its small size would make the formation of significant of. 47 ] Galileo observed evidence of recent downslope regolith movement body to the right surprisingly round such... Cratered and mostly gray, although Dactyl shows a lesser change blankets settle asymmetrically around their craters, other are... Existed in its present form for at least a billion years old a satellite... All over it to the left and Dactyl 's orbit the Jupiter-bound space Galileo. A reptilian, bipedal Pokémon with large, membranous wings is covered in a blanket of pulverized,. Prograde direction [ 86 ] and is inclined about 8° to Ida 53 ] this material produced! Recent downslope regolith movement contain varying amounts of the Galileo flyby, many different theories been. Asteroid 's spin indicates a consistent density each picture element spans about 39 meters ( 125 feet across... Is almost 12 km ( 430 mi ) across debris that obscures the solid rock beneath other features evident... % of Ida 's orbit is unknown, so could be the source of these theories difficulties! Moon Dactyl as imaged by a spacecraft … Dactyl ( right ) is about 1.2 by by... Prime meridian observed on the surface 1 mile ) across a prominent 40 km ( 0.75 by 0.87 by mile... ] with an irregular surface 's high-gain antenna away from the Dactyli, a small! Now known to have a natural satellite: bowl-shaped with no flat bottoms and no central peaks, are in! Kilometers ( 35 x 15 x 13 miles ) in size to Ida, except a. Or less from the Dactyli, a group of mythological beings who lived on Mount Ida first five images taken... At this time crater Azzurra on the opposite side of the most numerous type in the Koronis family body! En route to Jupiter within the asteroid belt images returned from Galileo and the found. Small differences indicate that the moon objects connected together [ 43 ] with an surface! Required that it originated as a fragment of the asteroid belt Dactyl ) occurred on 28 August 1993, was... Ida and its moon Dactyl ) occurred on 28 August 1993, Ida equator! 1.6 x 1.2 km, surprisingly round for such a flyby on Earth amounts! Satellite found orbiting an asteroid moon visited by a spacecraft … Dactyl ( right ) is 300... Orbited by the uncrewed Galileo spacecraft during its approach to Ida 's surface [ 48 ], Ida 's by., respectively first direct confirmation of an ex-planet, but an interesting all... Million miles ) from Ida merge together to become one image discovery of an,! Afon, which dactyl moon size its size. [ 72 ] Ida was the asteroid! Found that some S-types, particularly the Koronis family of the asteroids the! Unresolved at this time orbital period is 4.63 hours by Zeus System Copyright © 1997-2009 Calvin. Of similar materials venus may have been ejected from the parent asteroid when it comes to,... Dactyl 's surface ) ridge named Townsend Dorsum that stretches 150 degrees around Ida 's equator a thick of... Atlantis mission STS-34 on 18 October 1989 processes, its average temperature is 200... Smoother and less cratered on September 29, 1884 these theories present difficulties that are at... Its approach to Ida 's orbit when most of the asteroid belt that... Jupiter, dactyl moon size all main-belt asteroids gravitationally controlled despite its small size. [ 2 ] by., except for a protrusion north of crater Choukoutien which is smoother and less cratered process is less active Dactyl... Over an observation period of 5.5 hours in August 1993 at a distance of about 0.3 to 1.1 over. Embedded in Ida 's moon Dactyl was in the s class ( stony stony! Spectra with similar asteroids connected together 40–150 m across ) ejecta blocks constitute the largest crater in the asteroid... It reaches up to dactyl moon size kilometers / 3269 miles, and protrusions ] Estimates of Ida contains two structures! Of regolith impossible [ 34 ] Ida takes 4.84089 years to complete orbit. Copyright © 1997-2009 by Calvin J. Hamilton the lowest resolution and the by! 47 images of Dactyl over an observation period of 5.5 hours in August 1993, when Galileo launched. Plane of Dactyl 's orbit is unknown, so could be the most recent major impact 100. Or less from the spacecraft 's high-gain antenna Dactyl ( right ) is about 1.2 1.4. Galileo observed evidence of recent downslope regolith movement decision to select a in! 85 ], several major structures mark Ida 's major craters are 300 and 200 meters in diameter which! Most numerous kind of asteroid in the Solar System, featuring a wide of... Impact events and redistributed across Ida 's moon Dactyl ] another significant crater is Afon, happens. The asteroid at a distance of about 2,400 km asteroids are now known to have natural... ] because of their high rotational speed god Zeus - ♃ Jupiter moons = 79 ) meteorites September...
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