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Encyclopedia > Sextans
Sextans
Sextans
click for larger image
Abbreviation Sex
Genitive Sextantis
Symbology the Sextant
Right ascension 10 h
Declination
Area 314 sq. deg.
Ranked 47th
Number of stars
(magnitude < 3)
0
Brightest star α Sex
(App. magnitude 4.49)
Meteor showers
  • Sextantids
Bordering
constellations
Visible at latitudes between +80° and −80°
Best visible at 21:00 (9 p.m.) during the month of April
For the Ancient Roman coin denomination, see sextans (coin).
For the Sextans Dwarf galaxy, see Sextans (dwarf galaxy).

Sextans (Latin for Sextant) is a minor southern constellation which was introduced in the 17th century by Johannes Hevelius. This is a celestial map of the constellation Sextans, the Sextant. ... The genitive case is a grammatical case that indicates a relationship, primarily one of possession, between the noun in the genitive case and another noun. ... For other uses, see Sextant (disambiguation). ... Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... Here is a list of the 88 modern constellations by their area in the sky, measured in square degrees. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... Alpha Sextantis (α Sex / α Sextantis) is a star in the constellation Sextans. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... Leonid Meteor Shower From earliest times, humankind has noticed flurries of meteors that seemed to emanate from particular points in the sky at particular times of the year. ... Leo (Latin for lion, symbol , Unicode ♌) is a constellation of the zodiac. ... Hydra is the largest of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy. ... Crater (Latin for cup) is one of the 88 modern constellations and was also one of the 48 listed by Ptolemy. ... The sextans was an Ancient Roman bronze coin produced during the Roman Republic valued at one-sixth of an as (2 unciae). ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... For other uses, see Sextant (disambiguation). ... Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Johannes Hevelius Johannes Hevelius (Latin), also called (in German) Johann Hewelke or Johannes Hewel, or Jan Heweliusz (Polish), (born January 28, 1611 – died January 28, 1687), was a Polish councillor and major in Danzig (Gdańsk). ...

Contents


Notable features

Sextans is not a particularly bright constellation. It has only one star above the fifth magnitude, namely α Sextantis at magnitude 4.49. The constellation contains a few double stars, including γ, 35, and 40 Sextantis. There are few notable variable stars. Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... Alpha Sextantis (α Sex / α Sextantis) is a star in the constellation Sextans. ... Double Star is a science fiction novel by Robert A. Heinlein. ... Gamma Sextantis (γ Sex / γ Sextantis) is a triple star system in the constellation Sextans. ... Most stars are of nearly constant luminosity. ...


Notable deep sky objects

There are a few galaxies in Sextans. The most notable is NGC 3115 (called the Spindle galaxy), a spiral galaxy of magnitude 9.1 that is seen edge-on. It is believed to be around 20 million light years away. There are a few other galaxies, including NGC 3156, NGC 3165, NGC 3166, and NGC 3169, a group of four galaxies 60 million light years away. NGC 3166 and NGC 3169 are the brightest of the quartet, at tenth magnitude. These two galaxies, which are separated by only around 50,000 light years, are so close to each other that they affect each other's structure. NGC 3156 is of magnitude 12.4, and NGC 3165 is of magnitude 13.9. NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light years in diameter and approximately 60 million light years distant. ... NGC 3115, also called the Spindle Galaxy or the Spindle Galaxy in Sextans, was discovered by William Herschel on February 22, 1787. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...

Designation Type Right ascension (J2000.0) Declination (J2000.0) Size Mag.
NGC 3115 galaxy 10h 05m 14.1s -07° 43′ 09″ 8.3′ × 3.2′ 9.1
NGC 3166 galaxy 10h 13m 45.6s +03° 25′ 31″ 5.2′ × 2.7′ 10.4
NGC 3169 galaxy 10h 14m 14.8s +03° 28′ 00″ 4.8′ × 3.2′ 10.2

Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... The J2000. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ...

Mythology

Being a modern constellation, Sextans has no mythology associated with it. It was deigned to represent a sextant, an instrument that Hevelius made frequent use of in his observations.




Notable and named stars

BD F Mag. Star Names and other designations Right ascension (J2000.0) Declination (J2000.0) Ly away Comments
α 15 4.49 Alpha Sextantis 10h 07m 56.3s −00° 22' 18" 287
γ 8 5.05 Gamma Sextantis, ADS 7555 09h 52m 30.4s −08° 06' 18" 262
β 30 5.09v Beta Sextantis 10h 30m 17.5s −00° 38' 13" 345
δ 29 5.21 Delta Sextantis 10h 29m 28.7s −02° 44' 21" 300
ε 22 5.24 Epsilon Sextantis 10h 17m 37.8s −08° 04' 08" 183
18 5.65 18 Sextantis 10h 10m 55.8s −08° 25' 06"
19 5.77 19 Sextantis 10h 12m 48.3s +04° 36' 53"
35 5.79 35 Sextantis, ADS 7902 10h 43m 20.9s +04° 44' 52"
41 5.79 41 Sextantis, ADS 7942 10h 50m 18.1s −08° 53' 52"
17 5.91 17 Sextantis 10h 10m 07.5s −08° 24' 30"
25 5.97v SS Sextantis, 25 Sextantis 10h 23m 26.5s −04° 04' 27"
6 6.01 6 Sextantis 09h 51m 14.0s −04° 14' 36"
7 6.02 7 Sextantis 09h 52m 12.2s +02° 27' 15"
14 6.21 14 Sextantis 10h 06m 47.4s +05° 36' 41"
4 6.24 4 Sextantis 09h 50m 30.1s +04° 20' 37"
33 6.26 33 Sextantis 10h 41m 24.2s −01° 44' 30"
36 6.28 36 Sextantis 10h 45m 09.4s +02° 29' 17"
26 6.33 26 Sextantis 10h 26m 36.9s −00° 59' 17"
37 6.38 37 Sextantis 10h 46m 05.7s +06° 22' 24"
13 6.45 13 Sextantis 10h 04m 08.4s +03° 12' 04"
27 6.55 27 Sextantis 10h 26m 46.9s −04° 23' 18"
34 6.57 34 Sextantis 10h 42m 37.5s +03° 34' 59"
40 6.61 40 Sextantis, ADS 7936 10h 49m 17.3s −04° 01' 27"
23 6.66v RS Sextantis, 23 Sextantis 10h 21m 02.0s +02° 17' 23"
12 6.70 12 Sextantis 09h 59m 43.1s +03° 23' 05"
9 6.72 9 Sextantis 09h 54m 06.7s +04° 56' 43"
21 6.97 21 Sextantis 10h 14m 08.4s −07° 59' 36"
31 6.98 31 Sextantis 10h 30m 31.0s +02° 09' 01"
20 7.37 20 Sextantis 10h 13m 44.4s −07° 23' 02"
15.6 LHS 292 10h 48m 13s −11° 20' 12" 14.81

Source: The Bright Star Catalogue, 5th Revised Ed., The Hipparcos Catalogue, ESA SP-1200 Many of the brighter stars are given names which are known as Bayer designations. ... Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... The International Astronomical Union (IAU) is the internationally recognised authority for assigning designations to stars (and other celestial bodies). ... Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... The J2000. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Alpha Sextantis (α Sex / α Sextantis) is a star in the constellation Sextans. ... Gamma Sextantis (γ Sex / γ Sextantis) is a triple star system in the constellation Sextans. ... Double Star is a science fiction novel by Robert A. Heinlein. ... Beta Sextantis (β Sex / β Sextantis) is a star in the constellation Sextans. ... Alpha2 Canum Venaticorum variables are main sequence variable stars of spectral class B8p to A7p. ... Most stars are of nearly constant luminosity. ... Delta Sextantis (δ Sex / δ Sextantis) is a star in the constellation Sextans. ... Epsilon Sextantis (ε Sex / ε Sextantis) is a star in the constellation Sextans. ... Double Star is a science fiction novel by Robert A. Heinlein. ... LHS 292 is a red dwarf star in the constellation Sextans. ... A flare star is a variable star which can undergo unpredictable dramatic increases in brightness for a few minutes or a few hours. ...


See also


Constellations introduced by Johannes Hevelius in the 1690 text Firmamentum Sobiescianum Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Johannes Hevelius Johannes Hevelius (Latin), also called (in German) Johann Hewelke or Johannes Hewel, or Jan Heweliusz (Polish), (born January 28, 1611 – died January 28, 1687), was a Polish councillor and major in Danzig (Gdańsk). ... Events Giovanni Domenico Cassini observes differential rotation within Jupiters atmosphere. ...

Canes Venatici | Lacerta | Leo Minor | Lynx | Scutum | Sextans | Vulpecula

Obsolete Constellations introduced by Johannes Hevelius in the 1690 text Firmamentum Sobiescianum Canes Venatici (Latin for hunting dogs) is a small northern constellation that was introduced by Johannes Hevelius in the 17th century. ... Lacerta, being Latin for Lizard, is one of the 88 official constellations acknowledged by the International Astronomical Union. ... Leo Minor (Latin for Small Lion) is a rather dim constellation that can barely be recognized as a triangle and lies between the easily discerned constellations Ursa Major and Leo. ... Lynx is a constellation of the northern hemisphere, introduced in the 17th century by Johannes Hevelius. ... Scutum (Latin for shield) is a small constellation. ... Vulpecula, being Latin for Fox, is a faint northern constellation located in the middle of the Summer Triangle, an asterism consisting of the bright stars Deneb, Vega and Altair. ... Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Johannes Hevelius Johannes Hevelius (Latin), also called (in German) Johann Hewelke or Johannes Hewel, or Jan Heweliusz (Polish), (born January 28, 1611 – died January 28, 1687), was a Polish councillor and major in Danzig (Gdańsk). ... Events Giovanni Domenico Cassini observes differential rotation within Jupiters atmosphere. ...

Cerberus | Mons Maenalus | Triangulum Minor


Cerberus was a constellation created by Hevelius. ... Mons Maenalus (the Mountain) was a constellation created by Johannes Hevelius. ... Triangulum Minor or Triangulum Minus (Latin for lesser triangle) was a constellation created by Hevelius. ...

The 88 modern Constellations
Andromeda | Antlia | Apus | Aquarius | Aquila | Ara | Aries | Auriga | Boötes | Caelum | Camelopardalis | Cancer | Canes Venatici | Canis Major | Canis Minor | Capricornus | Carina | Cassiopeia | Centaurus | Cepheus | Cetus | Chamaeleon | Circinus | Columba | Coma Berenices | Corona Australis | Corona Borealis | Corvus | Crater | Crux | Cygnus | Delphinus | Dorado | Draco | Equuleus | Eridanus | Fornax | Gemini | Grus | Hercules | Horologium | Hydra | Hydrus | Indus | Lacerta | Leo | Leo Minor | Lepus | Libra | Lupus | Lynx | Lyra | Mensa | Microscopium | Monoceros | Musca | Norma | Octans | Ophiuchus | Orion | Pavo | Pegasus | Perseus | Phoenix | Pictor | Pisces | Piscis Austrinus | Puppis | Pyxis | Reticulum | Sagitta | Sagittarius | Scorpius | Sculptor | Scutum | Serpens | Sextans | Taurus | Telescopium | Triangulum | Triangulum Australe | Tucana | Ursa Major | Ursa Minor | Vela | Virgo | Volans | Vulpecula

Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Andromeda is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in Greek mythology. ... The constellation Antlia (Latin for pump) is a relatively new constellation as it was only created in the 18th century, being too faint to be acknowledged by the ancient Greeks. ... Apus (Latin for bird of paradise) is a faint southern constellation, not visible to the ancient Greeks. ... Aquarius (Latin for the Water-bearer or Cup-bearer, symbol , Unicode ♒) is the eleventh sign of the zodiac, situated between Capricornus and Pisces. ... Aquila (Latin for Eagle), is one of the 48 constellations listed by Ptolemy and is now also part of the list of 88 constellations acknowledged by the IAU. It lies roughly at the celestial equator. ... Ara (Latin for Altar) is a faint southerly constellation between the constellations Centaurus and Lupus. ... Aries (Latin for Ram, symbol , Unicode ♈) is one of the constellations of the zodiac. ... Auriga (Latin for chariot) is a northern constellation. ... Boötes, a name deriving from Egypt, is one of the 88 modern constellations and was also one of the 48 constellations listed by Ptolemy. ... Caelum (Latin for chisel, and similar to Latin for of the Sky) is a minor southern constellation introduced by Nicolas Louis de Lacaille. ... Camelopardalis, Latin for giraffe, is the name of a large but faint northern constellation first recorded by Jakob Bartsch in 1624, but probably created earlier by Petrus Plancius. ... In astronomy and astrology, Cancer (Latin for crab, symbol , Unicode ♋) is one of the twelve constellations of the zodiac. ... Canes Venatici (Latin for hunting dogs) is a small northern constellation that was introduced by Johannes Hevelius in the 17th century. ... Canis Major (Latin for the greater dog) is one of the 88 modern constellations, and was also in Ptolemys list of 48 constellations. ... Canis Minor (Latin for little dog) is one of the 88 modern constellations, and was also in Ptolemys list of 48 constellations. ... Capricornus ( or , Unicode: ♑), a name meaning Horned Goat or That which has horns like a goats in Latin, is one of the constellations of the zodiac. ... Carina (Latin for keel) is a southern constellation which forms part of the old constellation of Argo Navis. ... Cassiopeia is a northern constellation which Greek mythology considered to represent a vain queen. ... Centaurus (Latin for centaur) was one of the 48 constellations listed by Ptolemy, and counts also among the 88 modern constellations. ... Cepheus is a northern constellation named after King Cepheus in Greek mythology, and is considered to represent a king. ... Cetus (a name from Greek mythology, referring to a Whale or Sea monster, see Ceto) is a constellation of the southern sky, in the region known as the Water, near other watery constellations like Aquarius, Pisces, and Eridanus. ... For other uses of the word, see chameleon (disambiguation) Chamaeleon (Latin for chameleon) is a minor southern constellation. ... Circinus, Latin for Compass, is one of the small southern (declination −50 to −60 degrees) constellations. ... Columba, Latin for dove, is a small constellation just south to Canis Major and Lepus, it was cut out of the constellation Canis Major by Augustin Royer, in 1679. ... Coma Berenices (Latin for Berenices Hair) is a traditional asterism that has since become a constellation. ... Corona Australis or Corona Austrina (Latin for Southern Crown) was one of Ptolemys 48 constellations, and also counts among the 88 modern constellations. ... Corona Borealis (Latin for northern crown) is a small northern constellation whose main stars form a semicircular arc. ... Corvus (Latin for Raven/Crow) is a small southern constellation with only 11 stars visible to the naked eye (brighter than magnitude 5. ... Crater (Latin for cup) is one of the 88 modern constellations and was also one of the 48 listed by Ptolemy. ... Crux, being Latin for cross, commonly known as the Southern Cross (in contrast to the Northern Cross), is the smallest of the 88 modern constellations, but nevertheless one of the most famous. ... For the software company, see Cygnus Solutions. ... Delphinus, being Latin for Dolphin, is a rather small (ranked 69th) northern constellation very close to the celestial equator. ... Other uses: dorado is used in the fisheries of some Latin American countries to denote the edible fish mahi-mahi (Coryphaena hippurus Dorado is also the name of mythical Latin American warriors. ... Draco (Latin for Dragon) is a far northern constellation that is circumpolar for many northern hemisphere observers. ... Equuleus (Latin for horse-let (i. ... Eridanus is the sixth largest of the 88 modern constellations. ... Fornax (Latin for furnace) is a southern constellation which was first introduced by Nicolas Louis de Lacaille under the name Fornax Chemica (Latin for chemical furnace). ... Gemini (Latin for twins, symbol , Unicode ♊) is one of the constellations of the zodiac. ... Grus (Latin for Crane) is a southern constellation. ... Hercules is the fifth largest of the 88 modern constellations. ... Horologium (Latin for clock) is one of the lesser southern constellations (declination around -60 degrees). ... Hydra is the largest of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy. ... Hydrus (Latin for Hydra, also referred to as male Hydra or little Hydra) is a minor southern constellation. ... Indus is a southern constellation that is supposed to represent an American Indian. ... Lacerta, being Latin for Lizard, is one of the 88 official constellations acknowledged by the International Astronomical Union. ... Leo (Latin for lion, symbol , Unicode ♌) is a constellation of the zodiac. ... Leo Minor (Latin for Small Lion) is a rather dim constellation that can barely be recognized as a triangle and lies between the easily discerned constellations Ursa Major and Leo. ... Lepus (Latin for Hare) is a constellation, lying just south of Orion, and possibly representing a hare being chased by him. ... Libra (Latin for balance, symbol , Unicode ♎) is a constellation of the zodiac. ... Lupus (Latin for Wolf) is a southern constellation. ... Lynx is a constellation of the northern hemisphere, introduced in the 17th century by Johannes Hevelius. ... Lyra (Latin for Lyre) is one of the 48 constellations listed by Ptolemy, and is one of the 88 modern constellations recognized by the International Astronomical Union. ... Mensa (Latin for Table) is a southern constellation which was first introduced by Nicolas Louis de Lacaille under the name Mons Mensae (Latin for table mountain). ... Categories: Astronomy stubs | Modern constellations | Constellations ... Monoceros (Latin for Unicorn) is a faint constellation on the winter night sky, surrounded by Orion to the west, Gemini to the north, Canis Major to the south and Hydra to the east. ... Musca (Latin for Fly) is one of the minor southern constellations. ... Norma (Latin for Normal, i. ... Octans (Latin for octant) is an inconspicuous constellation introduced by Nicolas Louis de Lacaille. ... Ophiuchus (known as the serpent holder) is one of the 88 constellations, and was also one of the 48 listed by Ptolemy. ... Orion, a constellation often referred to as The Hunter, is a prominent constellation, perhaps the best-known in the sky. ... PENIS, being Latin for your small cock, is a southern constellation. ... Pegasus is a northern constellation, named after the mythological Pegasus. ... Perseus is a northern constellation, named after the Greek hero who slew the monster Medusa. ... Categories: Astronomy stubs | Modern constellations | Constellations ... Pictor, being Latin for easel, is one of the minor southern (declination -50 to -60) constellations. ... Pisces (Latin for fish (plural), symbol , Unicode ♓) is a zodiac constellation which lies between Aquarius to the west and Aries to the east. ... Piscis Austrinus or Piscis Australis (both of which are Latin for Southern Fish) was one of the 48 constellations listed by Ptolemy, and is also one of the 88 modern constellations. ... Puppis (Latin for poop deck) is a southern constellation. ... Categories: Astronomy stubs | Modern constellations | Constellations | Pyxis constellation | Argo Navis constellation ... Reticulum (Latin for reticle), is one of the minor southern (declination -60 degrees) constellations. ... Sagitta, being Latin for Arrow, is the third-smallest of all constellations (only Equuleus and Crux are smaller). ... Sagittarius (Latin for Archer, symbol , Unicode ♐) is a constellation of the zodiac, commonly depicted as a centaur drawing a bow. ... Scorpius (Latin for scorpion, symbol , Unicode ♏) is one of the constellations of the zodiac. ... Categories: Astronomy stubs | Modern constellations | Constellations | Sculptor constellation ... Scutum (Latin for shield) is a small constellation. ... Serpens (the snake) is one of the 88 modern constellations, and was also one of the 48 listed by Ptolemy. ... Taurus (Latin for bull, symbol , Unicode ♉) is one of the constellations of the zodiac. ... Telescopium (Latin for Telescope) is a minor southern constellation identified and named by Nicolas Louis de Lacaille, the 18th century French astronomer, a student of the southern skies. ... Triangulum is a small northern constellation whose three brightest stars, of third and fourth magnitude, form an elongated triangle. ... Triangulum Australe is a small southern constellation whose three brightest stars, of second and third magnitude, form an approximately equilateral triangle. ... Tucana (Latin for Toucan) is a southern constellation. ... Ursa Major (Ursa Maior in Latin) is a constellation visible throughout the year in the northern hemisphere. ... Ursa Minor is a constellation in the northern sky, the name of which means Small Bear in Latin. ... Vela (Latin for sails) is a southern constellation, one of the four parts into which Argo Navis was split (the others being; Carina (constellation), Puppis and Pyxis. ... See VIRGO (physics) for a French-Italian project in physics. ... Categories: Astronomy stubs | Modern constellations | Constellations | Volans constellation ... Vulpecula, being Latin for Fox, is a faint northern constellation located in the middle of the Summer Triangle, an asterism consisting of the bright stars Deneb, Vega and Altair. ...

External links

Wikimedia Commons has media related to:
Sextans
  • The Deep Photographic Guide to the Constellations: Sextans

 
 

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