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Asteroid spectral type indicating stony composition
S-type (stony-type or siliceous-type) asteroids are asteroids with a spectral type that is indicative of a siliceous (i.e. stony) mineralogical composition
S-type_asteroid
Grouping of asteroids
The X-group of asteroids collects together several types with similar spectra, but probably quite different compositions. In the Tholen classification
X-type_asteroid
Most common asteroid spectral type
C-type (carbonaceous /ˌkɑːrbəˈneɪʃəs/) asteroids are the most common variety, forming around 75% of known asteroids. They are volatile-rich and distinguished
C-type_asteroid
Asteroid spectral type
E-type (enstatite achondrite–type) asteroids are asteroids thought to have enstatite (MgSiO3) achondrite surfaces. They form a large proportion of asteroids
E-type_asteroid
Asteroid spectral type
M-type (metallic-type, a.k.a. M-class) asteroids are a spectral class of asteroids which appear to contain higher concentrations of metal phases (e.g.
M-type_asteroid
A V-type (volcanic-type) asteroid, or Vestoid, is an asteroid whose spectral type is that of 4 Vesta. Approximately 6% of main-belt asteroids are vestoids
V-type_asteroid
Classification type of a class of astronomical objects
An asteroid spectral type is assigned to asteroids based on their reflectance spectrum, color, and sometimes albedo. These types are thought to correspond
Asteroid_spectral_types
Type of asteroid spectral group
D-type asteroids have a very low albedo and a featureless reddish spectrum. It has been suggested that they have a composition of organic-rich silicates
D-type_asteroid
Classification of asteroids
P-type (primitive-type) asteroids have low albedo and a featureless reddish spectrum. It has been suggested that they have a composition of organic-rich
P-type_asteroid
Type of asteroid
during studies of the Eos family of asteroids. Asteroid spectral types L-type asteroid S-type asteroid X-type asteroid 181 Eucharis 221 Eos 402 Chloë 417
K-type_asteroid
Minor planet found within the inner Solar System
into C-type (carbonaceous), M-type (metallic), or S-type (silicaceous). The size and shape of asteroids vary significantly, ranging from small rubble piles
Asteroid
Apollo asteroid target of Hayabusa2's extended mission
an Apollo-type near-Earth asteroid with a diameter of about 450 metres (1,500 feet). It was discovered by the Lincoln Near-Earth Asteroid Research (LINEAR)
98943_Torifune
Main-belt asteroid
telescopic observations categorized Ida as an S-type asteroid, the most numerous type in the inner asteroid belt. On 28 August 1993, Ida was visited by
243_Ida
Exploitation of raw materials from asteroids
Multiple types of asteroids have been identified but the three main types would include the C-type, S-type, and M-type asteroids: C-type asteroids have a
Asteroid_mining
Type of asteroid
(behind S-type and Sq-type, but slightly more common than C-type). Q-type asteroids are spectrally more similar to ordinary chondrite meteorites (types H,
Q-type_asteroid
Main belt asteroid target of the Lucy mission
of S-type asteroids because it exhibits the 1 μm olivine and pyroxene spectral absorption band that is characteristically seen in Q-type asteroids. On
152830_Dinkinesh
Risk-listed near-Earth asteroid
2024 YR4 is an asteroid with an estimated diameter of 53 to 67 metres (174 to 220 ft) that is classified as an Apollo-type (Earth-crossing) near-Earth
2024_YR4
Stony main-belt asteroid
tied with three other asteroids as the thirteenth largest asteroid, and it is one of the two largest stony (S-type) asteroids, along with 15 Eunomia
3_Juno
Stony main-belt asteroid
15 Eunomia is a large asteroid in the middle asteroid belt. It is the largest of the stony (S-type) asteroids, with a mean diameter of about 270 kilometres
15_Eunomia
S-type asteroid in the inner asteroid belt with stony mineralogical composition
951 Gaspra is an S-type asteroid that orbits very close to the inner edge of the asteroid belt. Gaspra was discovered by Russian astronomer G. N. Neujmin
951_Gaspra
Relatively uncommon asteroids
L-type asteroids are relatively uncommon asteroids with a strongly reddish spectrum shortwards of 0.75 μm, and a featureless flat spectrum longwards of
L-type_asteroid
Main-belt asteroid
binary asteroid located in the inner region of the main asteroid belt. It is the largest and brightest known E-type asteroid, a rare type of asteroid with
44_Nysa
Main-belt asteroid
stony S-type asteroid and the largest one in the intermediate main belt with more than 5,000 members. It orbits the Sun in the central asteroid belt at
5196_Bustelli
Prehistoric impact crater in Mexico
that 298 Baptistina has a different composition more typical of an S-type asteroid than the presumed carbonaceous chondrite composition of the Chicxulub
Chicxulub_crater
Sub-kilometer sized asteroid and binary system on an eccentric orbit
asteroid was named after Hermes from Greek mythology. It is noted for having been the last remaining named lost asteroid, rediscovered in 2003. The S-type
69230_Hermes
Potentially hazardous near-Earth asteroid in the Apollo group
hazardous asteroid. It was discovered by the LINEAR program in 1998 and later named after Japanese rocket engineer Hideo Itokawa. The peanut-shaped S-type asteroid
25143_Itokawa
Asteroid spectral type
O-type asteroids are a rare type of asteroids that have spectra similar to the unusual asteroid 3628 Boznemcová, which is the best asteroid match to the
O-type_asteroid
Main-belt asteroid
Harvard-Smithsonian Center for Astrophysics in Massachusetts, United States. The S-type asteroid has a rotation period of 10.6 hours and measures approximately 20 kilometers
1252_Celestia
Topics referred to by the same term
S-Type may refer to: S-type asteroid, asteroids with siliceous mineralogical composition S type fuse, electrical fuses with an Edison base S-type granite
S-Type
Asteroid visited by New Horizons
its flyby in June 2006, when it was passing through the asteroid belt. The stony S-type asteroid measures approximately 2.5 kilometers (1.6 miles) in diameter
132524_APL
Large main-belt asteroid
fourth-brightest object in the asteroid belt. 7 Iris is classified as an S-type asteroid, meaning that it has a stony composition. Iris was discovered on 13
7_Iris
Region between the orbits of Mars and Jupiter
basic groups: carbonaceous (C-type), silicate (S-type), and X-type, which includes metal-rich asteroids. The asteroid belt formed from the primordial
Asteroid_belt
Stony near-Earth asteroid
Earth's orbit. The S-type asteroid has a rotation period of 10.3 hours. Ganymed is an Amor asteroid, a subgroup of the near-Earth asteroids that approach the
1036_Ganymed
Large asteroid
of magnesium and iron. It is an S-type asteroid in the Tholen classification system. Astraea was the fifth asteroid discovered, on 8 December 1845, by
5_Astraea
Sub-kilometer asteroid
principal scientist for the NEAT project until her retirement in 2002. The S-type asteroid measures approximately 900 meters in diameter, has a longer-than average
2062_Aten
Main-belt asteroid
started negotiations with Attila the Hun. It is classified as a stony S-type asteroid based upon its spectrum. 236 Honoria is orbiting close to a 5:2 mean
236_Honoria
Main-belt asteroid
138 Tolosa is a brightly coloured, stony background asteroid from the inner region of the asteroid belt. It was discovered by French astronomer Henri Joseph
138_Tolosa
Main-belt asteroid
915 Cosette is an S-type asteroid[1] belonging to the Flora family of Main Belt asteroids. Its rotation period is 4.445 hours[link removed]. "915 Cosette
915_Cosette
Main-belt asteroid
Union named the S-type asteroid after Greco-Roman astronomer Ptolemy. Ptolemaeus is a member of the Flora family (402), a giant asteroid family and the
4001_Ptolemaeus
Small Eunomian Asteroid
the S-type asteroid from afar during its coast to Saturn. Masursky is a member of the Eunomia family (502), a prominent family of stony asteroids and
2685_Masursky
Main-belt asteroid
inclination of 6.0° to the plane of the ecliptic. This is a stony S-type asteroid with a cross-sectional size of 56 km, Photometry from the Oakley Observatory
67_Asia
Japanese space mission to asteroid Ryugu
flew by the S-type asteroid Torifune in July 2026. The encounter and observation of the asteroid were conducted at a high relative speed (5 km/s), however
Hayabusa2
Near-Earth asteroid
433 Eros is a stony asteroid of the Amor group, and the first discovered, and second-largest near-Earth object. It has an elongated shape and a volume-equivalent
433_Eros
Main-belt asteroid
typical, although sizeable Main belt asteroid. It is classified as an S-type asteroid. Like other asteroids of its type, it is light in colour. It was discovered
204_Kallisto
Asteroid in the Asteroid belt
this object is classified as a K-type asteroid. The orbital properties show it to be a member of the extensive Eos asteroid family, which is named after it
221_Eos
Dark Ursula asteroid from the outer regions of the asteroid belt
classification, Scythia is a stony S-type asteroid, unlike the overall spectral type of the Ursula family which is that of a C- and X-type. In September 2003, a rotational
1306_Scythia
Main-belt asteroid
the goddess, Nephthys in Egyptian mythology. It is classified as an S-type asteroid. Noah Webster (1884) A Practical Dictionary of the English Language
287_Nephthys
Large main-belt asteroid
classified as an S-type asteroid under the Tholen classification scheme. Planetary scientist Michael James Gaffey further subdivided S-type asteroids into seven
6_Hebe
Main-belt asteroid
29 Amphitrite is one of the largest S-type asteroids, approximately 200 kilometers (120 miles) in diameter, and probably fifth largest after Eunomia, Juno
29_Amphitrite
Main-belt asteroid
901 Brunsia is an S-type asteroid belonging to the Flora family in the Main Belt. Its rotation period is 3.136 hours. "901 Brunsia (1918 EE)". JPL Small-Body
901_Brunsia
Main-belt asteroid
851 Zeissia /ˈzaɪsiə/ is an S-type asteroid background asteroid from the inner region of the asteroid belt. Its diameter is about 12 km and it has an
851_Zeissia
Main-belt asteroid
categorized as an S-type asteroid consisting of mainly of iron- and magnesium-silicates. This the second most common type of asteroid in the main belt
23_Thalia
Main-belt asteroid
similar to Q-type asteroids. Since Polyhymnia shares both characteristics of S- and Q-type asteroids, it is further classified as an Sq-type asteroid according
33_Polyhymnia
Main-belt asteroid
NASA/Jet Propulsion Laboratory. Retrieved 4 May 2016. 811 Nauheima at AstDyS-2, Asteroids—Dynamic Site Ephemeris · Observation prediction · Orbital info · Proper
811_Nauheima
Main-belt asteroid
Johann Palisa at the Austrian Naval Observatory in today's Croatia. The S-type asteroid has a rotation period of 12.32 hours and a rather spherical shape.
178_Belisana
Main-belt asteroid
indicate somewhat spherical proportions.[citation needed] This is a stony S-type asteroid with a mean diameter of around 152 km. It is spinning with a rotation
14_Irene
Main-belt asteroid
The likely S-type asteroid was named for the McGraw-Hill Telescope located at Kitt Peak, Arizona. McGraw-Hill is a non-family asteroid from the main
4432_McGraw-Hill
Main-belt asteroid
Luther at the Bilk Observatory in Düsseldorf, Germany. The elongated S-type asteroid has a rotation period of 9.95 hours. It was named after Amalthea from
113_Amalthea
Asteroid
mission before it could approach the asteroid. In the Tholen and SMASS classification, Geographos is an S-type asteroid. This means that it is highly reflective
1620_Geographos
Asteroid
Oikawa at the old Tokyo Astronomical Observatory in Japan. The stony S-type asteroid has a notably short rotation period of 3.0 hours and measures approximately
1088_Mitaka
Main-belt asteroid
Croatia. The S-type asteroid has a rotation period of 11.77 hours. It was named for the Istrian Peninsula. Istria is a non-family asteroid from the main
183_Istria
Main-belt asteroid
respect to the ecliptic plane. Melpomene is classified as a stony S-type asteroid. Melpomene occulted the star SAO 114159 on 11 December 1978. A possible
18_Melpomene
Main-belt asteroid
219 Thusnelda is a typical S-type Main belt asteroid. It was discovered by Johann Palisa on September 30, 1880, in Pola and was named after Thusnelda
219_Thusnelda
Large main-belt asteroid
astronomical units on a 3.57 year long orbit. It is thought to be a stony S-type asteroid, and it rotates once every 8.66 hours. Victoria was discovered by English
12_Victoria
Main-belt asteroid
270 Anahita is a stony S-type Main belt asteroid. It was discovered by C. H. F. Peters on October 8, 1887, in Clinton, New York, and was named after the
270_Anahita
Main-belt asteroid
a minor planet orbiting the Sun. The asteroid is named after the biblical figure Esther. In 2001, the asteroid was detected by radar from the Arecibo
622_Esther
Binary near-Earth asteroid
(M.P.C. 115894). In the SMASS classification, the asteroid a characterized as a stony S-type asteroid. Moshup has a minor-planet moon orbiting it. The
66391_Moshup
Stony background asteroid
peninsula. The elongated S-type asteroid has a rotation period of 5.9 hours. It was named after Russian amateur astronomer Nikolai Maltsov (S. I. Maltsov) who
749_Malzovia
Main-belt asteroid
118 Peitho is a main-belt asteroid. It is probably an S-type asteroid, suggesting a siliceous mineralogy. It was discovered by R. Luther on March 15,
118_Peitho
Main-belt asteroid
192 Nausikaa is a large main-belt S-type asteroid. It was discovered by Johann Palisa on February 17, 1879, at Pula, then in Austria, now in Croatia.
192_Nausikaa
Mars-crossing asteroid
Birgitta Angelica Lagerkvist. The S-type asteroid has a rotation period of 9.0 hours. Birgitta is a Mars-crossing asteroid, a dynamically unstable group between
2744_Birgitta
Main-belt asteroid
883 Matterania is an S-type asteroid[1] belonging to the Flora family in the Main Belt. Its rotation period is 5.64 hours. "883 Matterania (1917 CP)"
883_Matterania
Eos asteroid
Parchomenko at the Simeiz Observatory on the Crimean peninsula. The stony S-type asteroid has a rotation period of 5.1 hours and measures approximately 34 kilometers
1129_Neujmina
Main-belt Asteroid
Johann Palisa at the Austrian Naval Observatory in today's Croatia. The S-type asteroid has a very long rotation period of 80 hours and likely an elongated
182_Elsa
Rare-type, spheroidal Amor asteroid
classification, Anteros is a common S-type asteroid, while in the SMASS taxonomy, it is a relatively rare L-type asteroid, described as a reddish but otherwise
1943_Anteros
Stony asteroid named after Fred Rogers
Eleanor Helin at the Palomar Observatory in California. The likely S-type asteroid has a rotation period of 8.0 hours. It was named after children's television
26858_Misterrogers
Main-belt asteroid
transitional S-type asteroid has a rotation period of 11.17 hours. It was named after Clytemnestra from Greek mythology. Together with asteroid 9506 Telramund
179_Klytaemnestra
Active main belt asteroid
Phocaea asteroid from the inner regions of the asteroid belt, approximately 3.7 kilometers (2.3 miles) in diameter. The likely S-type asteroid was discovered
6478_Gault
Metallic main-belt asteroid
16 Psyche (/ˈsaɪkiː/ SY-kee) is a large M-type asteroid, which was discovered by the Italian astronomer Annibale de Gasparis, on 17 March 1852 and named
16_Psyche
Near-Earth asteroid
showed it to be silicate in nature, which also qualifies it as a stony S-type asteroid. It rotates rapidly, with a period of 2.26 hours and a low brightness
65803_Didymos
S-type asteroid native to the asteroid belt
685 Hermia is an S-type asteroid belonging to the Flora family in the Main Belt. Its diameter is about 11 km and it has an albedo of 0.281. "685 Hermia
685_Hermia
Main-belt asteroid
496 Gryphia is an S-type asteroid belonging to the Flora family in the Main Belt. Its diameter is about 15 km and it has an albedo of 0.168. This object
496_Gryphia
Main-belt asteroid
inclination of 3.6° to the plane of the ecliptic. This is a stony S-type asteroid with a cross-sectional size of 60.2 km that is spinning with a rotation
60_Echo
Main-belt asteroid
417 Suevia is a typical Main belt asteroid. It is classified as a K-type/S-type asteroid. It was discovered by Max Wolf on 6 May 1896 in Heidelberg. "Suevian"
417_Suevia
Florian asteroid
common S-type asteroid. On 2 November 2002, the Stardust space probe flew past Annefrank at a distance of 3079 km. Its images show the asteroid to be 6
5535_Annefrank
Main-belt asteroid
and Eugene Shoemaker at the Palomar Observatory in California. The S-type asteroid has a rotation period of 3.26 hours. It was named for Australian geologist
3640_Gostin
Elongated stony asteroid and near-Earth object
and Tholen taxonomic scheme, Ivar is characterized as a common stony S-type asteroid. A large number of rotational lightcurves of Ivar have been obtained
1627_Ivar
Asteroid
for the historical Royal Greenwich Observatory in England. The stony S-type asteroid has a long rotation period of 24 hours and measures approximately 9
2830_Greenwich
Stony Koronian asteroid
in 1933, it was later named after the Georgian city of Kutaisi. The S-type asteroid has a rotation period of 3.6 hours and measures approximately 22 kilometers
1289_Kutaïssi
Main-belt asteroid
the Heidelberg-Königstuhl State Observatory on 10 March 1920. The S-type asteroid has a short rotation period of 3.3 hours and is likely spherical in
929_Algunde
Asteroid
Sekhmet, the Egyptian goddess of war. Sekhmet is believed to be an S-type asteroid, and some believe its diameter is approximately 1.4 km. In December
5381_Sekhmet
Main-belt asteroid
the ecliptic. The spectrum of this object indicates that it is an S-type asteroid with both low and high calcium forms of pyroxene on the surface, along
17_Thetis
Main-belt asteroid
126 Velleda is a main-belt asteroid. It is probably a rather typical, albeit sizable, S-type asteroid. This asteroid was named for Veleda, a priestess
126_Velleda
Asteroid and near-Earth object
first time that an asteroid was seen to approach Earth so closely. The assumed S-type asteroid is one of few low-numbered asteroids for which no rotation
1221_Amor
Main-belt asteroid
Heidelberg-Königstuhl State Observatory on 22 October 1900. The stony S-type asteroid has a rotation period of 8.7 hours and measures approximately 35 kilometers
462_Eriphyla
Bright background asteroid and slow rotator
Johann Palisa at the Vienna Observatory on 18 October 1911. The stony S-type asteroid has a notably long rotation period of 131.1 hours and measures approximately
722_Frieda
Asteroid
Bus at the Siding Spring Observatory in Australia. The spheroidal S-type asteroid has a rotation period of 3.14 hours. It was named after British science
4923_Clarke
Grouping of S-type asteroids
discovered members both because S-type asteroids tend to have high albedo, and because it is the closest major asteroid grouping to Earth. 8 Flora: 36
Flora_family
Main-belt asteroid
1006/icar.2002.6907. Hiroi, T.; et al. (March 1993). "Modeling of S-type asteroid spectra using primitive achondrites and iron meteorites". Icarus. 102
32_Pomona
Planet
NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016. 600 Musa at AstDyS-2, Asteroids—Dynamic Site Ephemeris · Observation prediction · Orbital info · Proper
600_Musa
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