The Constellations | IAU

Over half of the 88 constellations the IAU recognizes today are attributed to ancient Greek, which consolidated the earlier works by the ancient Babylonian, Egyptian and Assyrian. Forty eight of the constellations we know were recorded in the seventh and eighth books of Claudius Ptolemy’s Almagest, although the exact origin of these constellations still remains uncertain. Ptolemy’s descriptions are probably strongly influenced by the work of Eudoxus of Knidos in around 350 BC. Between the 16th and 17th century AD, European astronomers and celestial cartographers added new constellations to the 48 previously described by Ptolemy; these new constellations were mainly “new discoveries” made by the Europeans who first explored the southern hemisphere. Those who made particular contributions to the “new” constellations include the Polish-born, German astronomer Johannes Hevelius; three Dutch cartographers, Frederick de Houtman, Pieter Dirksz Keyser and Gerard Mercator; the French astronomer Nicolas Louis de Lacaille; the Flemish mapmaker Petrus Plancius and the Italian navigator Amerigo Vespucci.

IAU and the 88 Constellations

Originally the constellations were defined informally by the shapes made by their star patterns, but, as the pace of celestial discoveries quickened in the early 20th century, astronomers decided it would be helpful to have an official set of constellation boundaries. One reason was to aid in the naming of new variable stars, which brighten and fade rather than shine steadily. Such stars are named for the constellation in which they reside, so it is important to agree where one constellation ends and the next begins.

Eugène Delporte originally listed the 88 “modern” constellations on behalf of the IAU Commission 3 (Astronomical Notations), in Délimitation scientifique des constellations. (Delporte, 1930)



Constellation Figures

In star maps it is common to mark line “patterns” that represent the shapes that give the name to the constellations. However, the IAU defines a constellation by its boundary (indicated by sky coordinates) and not by its pattern and the same constellation may have several variants in its representation.

The constellations should be differentiated from asterisms. Asterisms are patterns or shapes of stars that are not related to the known constellations, but nonetheless are widely recognised by laypeople or in the amateur astronomy community. Examples of asterisms include the seven bright stars in Ursa Major known as “the Plough” in Europe or “the Big Dipper” in America, as well as “the Summer Triangle”, a large triangle, seen in the summer night sky in the northern hemisphere and composed of the bright stars Altair, Deneb and Vega. Whilst a grouping of stars may be officially designated a constellation by the IAU, this does not mean that the stars in that constellation are necessarily grouped together in space. Sometimes stars will be physically close to each other, like the Pleiades, but constellations are generally really a matter of perspective. They are simply our Earth-based interpretation of two dimensional star patterns on the sky made up of stars of many differing brightnesses and distances from Earth.

 

Constellation Names

Each Latin constellation name has two forms: the nominative, for use when talking about the constellation itself, and the genitive, or possessive, which is used in star names. For instance, Hamal, the brightest star in the constellation Aries (nominative form), is also called Alpha Arietis (genitive form), meaning literally “the alpha of Aries”.

The Latin names of all the constellations, their abbreviated names and boundaries can be found in the table below. They are a mix of the ancient Greek patterns recorded by Ptolemy as well as some more “modern” patterns observed later by more modern astronomers.

The IAU adopted three-letter abbreviations of the constellation names at its inaugural General Assembly in Rome in 1922. So, for instance, Andromeda is abbreviated to And whilst Draco is abbreviated to Dra.

Charts and tables

The charts below were produced in collaboration with Sky & Telescope magazine (Roger Sinnott & Rick Fienberg). Alan MacRobert’s constellation patterns, drawn in green in the charts, were influenced by those of H. A. Rey but in many cases were adjusted to preserve earlier traditions. The images are released under the Creative Commons Attribution 3.0 Unported license.

Quick links : And , Ant, Aps, Aqr, Aql, Ara, Ari, Aur, Boo, Cae, Cam, Cnc, CVn, CMa, CMi, Cap, Car, Cas, Cen, Cep, Cet, Cha, Cir, Col, Com, CrA, CrB, Crv, Crt, Cru, Cyg, Del, Dor, Dra, Equ, Eri, For, Gem, Gru, Her, Hor, Hya, Hyi, Ind, Lac, Leo, LMi, Lep, Lib, Lup, Lyn, Lyr, Men, Mic, Mon, Mus, Nor, Oct, Oph, Ori, Pav, Peg, Per, Phe, Pic, Psc, PsA, Pup, Pyx, Ret, Sge, Sgr, Sco, Scl, Sct, Ser, Sex, Tau, Tel, Tri, TrA, Tuc, UMa, UMi, Vel, Vir, Vol, Vul , Chart text legend

Charts Graphical Legend

Charts

Name /
Pronunciation
Abbr. English Name Genitive /
Pronunciation
Downloads
Andromeda

an-DRAH-mih-duh

And the Chained Maiden Andromedae
an-DRAH-mih-dee
Constellation charts
GIF (117 KB)
PDF (829 KB)
TIF

Constellation boundary
TXT (2 KB)

Antlia

ANT-lee-uh

Ant the Air Pump Antliae
ANT-lee-ee
Constellation charts
GIF (111 KB)
PDF (815 KB)
TIF

Constellation boundary
TXT (1 KB)

Apus
APE-us, APP-us
Aps the Bird of Paradise Apodis

APP-oh-diss

Constellation charts
GIF (155 KB)
PDF (836 KB)
TIF

Constellation boundary
TXT (1 KB)

Aquarius

uh-QUAIR-ee-us

Aqr the Water Bearer Aquarii

uh-QUAIR-ee-eye

Constellation charts
GIF (124 KB)
PDF (879 KB)
TIF

Constellation boundary
TXT (1 KB)

Aquila

ACK-will-uh, uh-QUILL-uh

Aql the Eagle Aquilae

ACK-will-ee, uh-QUILL-ee

Constellation charts
GIF (108 KB)
PDF (820KB)
TIF

Constellation boundary
TXT (1 KB)

Ara

AIR-uh, AR-uh

Ara the Altar Arae

AIR-ee, AR-ee

Constellation charts
GIF (114 KB)
PDF (807 KB)
TIF

Constellation boundary
TXT (1 KB)

Aries

AIR-eez, AIR-ee-yeez

Ari the Ram Arietis

uh-RYE-ih-tiss

Constellation charts
GIF (118 KB)
PDF (805 KB)
TIF

Constellation boundary
TXT (1 KB)

Auriga

aw-RYE-guh

Aur the Charioteer Aurigae

aw-RYE-ghee

Constellation charts
GIF (122 KB)
PDF (381 KB)
TIF

Constellation boundary
TXT (1 KB)

Boötes

bo-OH-teez

Boo the Herdsman Boötis

bo-OH-tiss

Constellation charts
GIF (147 KB)
PDF (823KB)
TIF

Constellation boundary
TXT (1 KB)

Caelum

SEE-lum

Cae the Engraving Tool Caeli

SEE-lye

Constellation charts
GIF (97 KB)
PDF (780 KB)
TIF

Constellation boundary
TXT (1 KB)

Camelopardalis

cuh-MEL-oh- PAR-duh-liss

Cam the Giraffe Camelopardalis

cuh-MEL-oh- PAR-duh-liss

Constellation charts
GIF (156 KB)
PDF (888 KB)
TIF

Constellation boundary
TXT (2 KB)

Cancer

CAN-ser

Cnc the Crab Cancri

CANG-cry

Constellation charts
GIF (108 KB)
PDF (814 KB)
TIF

Constellation boundary
TXT (1 KB)

Canes Venatici

CANE-eez (CAN-eez) ve-NAT-iss-eye

CVn the Hunting Dogs Canum Venaticorum

CANE-um (CAN-um) ve-nat-ih-COR-um

Constellation charts
GIF (106 KB)
PDF (790 KB)
TIF

Constellation boundary
TXT (1 KB)

Canis Major

CANE-iss (CAN-iss) MAY-jer

CMa the Great Dog Canis Majoris

CANE-iss (CAN-iss) muh-JOR-iss

Constellation charts
GIF (134 KB)
PDF (849 KB)
TIF

Constellation boundary
TXT (1 KB)

Canis Minor

CANE-iss (CAN-iss) MY-ner

CMi the Lesser Dog Canis Minoris

CANE-iss (CAN-iss) mih-NOR-iss

Constellation charts
GIF (83 KB)
PDF (766 KB)
TIF

Constellation boundary
TXT (1 KB)

Capricornus

CAP-rih-CORN-us

Cap the Sea Goat Capricorni

CAP-rih-CORN-eye

Constellation charts
GIF (98 KB)
PDF (818 KB)
TIF

Constellation boundary
TXT (1 KB)

Carina

cuh-RYE-nuh, cuh-REE-nuh

Car the Keel Carinae

cuh-RYE-nee, cuh-REE-nee

Constellation charts
GIF (143 KB)
PDF (882 KB)
TIF

Constellation boundary
TXT (1 KB)

Cassiopeia

CASS-ee-uh-PEE-uh

Cas the Seated Queen Cassiopeiae

CASS-ee-uh-PEE-ye

Constellation charts
GIF (139 KB)
PDF (846 KB)
TIF

Constellation boundary
TXT (1 KB)

Centaurus Cen the Centaur Centauri Constellation charts
GIF (178 KB)
PDF (549 KB)
TIF

Constellation boundary
TXT (1 KB)

Cepheus Cep the King Cephei Constellation charts
GIF (200 KB)
PDF (873 KB)
TIF

Constellation boundary
TXT (2 KB)

Cetus

SEE-tus

Cet the Sea Monster Ceti

SEE-tie

Constellation charts
GIF (122 KB)
PDF (873 KB)
TIF

Constellation boundary
TXT (1 KB)

Chamaeleon

cuh-MEAL-yun, cuh-MEAL-ee-un

Cha the Chameleon Chamaeleontis

cuh-MEAL-ee-ON-tiss

Constellation charts
GIF (183 KB)
PDF (834 KB)
TIF

Constellation boundary
TXT (1 KB)

Circinus

SER-sin-us

Cir the Compass Circini

SER-sin-eye

Constellation charts
GIF (131 KB)
PDF (818 KB)
TIF

Constellation boundary
TXT (1 KB)

Columba

cuh-LUM-buh

Col the Dove Columbae

cuh-LUM-bee

Constellation charts
GIF (99 KB)
PDF (797 KB)
TIF

Constellation boundary
TXT (1 KB)

Coma Berenices

COE-muh BER-uh-NICE-eez

Com the Bernice’s Hair Comae Berenices

COE-mee BER-uh-NICE-eez

Constellation charts
GIF (101 KB)
PDF (788 KB)
TIF

Constellation boundary
TXT (1 KB)

Corona Australis

cuh-ROE-nuh aw-STRAL-iss3

CrA the Southern Crown Coronae Australis

cuh-ROE-nee aw-STRAL-iss3

Constellation charts
GIF (107 KB)
PDF (787 KB)
TIF

Constellation boundary
TXT (1 KB)

Corona Borealis

cuh-ROE-nuh bor-ee-AL-iss3

CrB the Northern Crown cuh-ROE-nee bor-ee-AL-iss3 Constellation charts
GIF (89 KB)
PDF (771 KB)
TIF

Constellation boundary
TXT (1 KB)

Corvus

COR-vus

Crv the Crow Corvi

COR-vye

Constellation charts
GIF (74 KB)
PDF (763 KB)
TIF

Constellation boundary
TXT (1 KB)

Crater

CRAY-ter

Crt the Cup Crateris

cruh-TEE-riss

Constellation charts
GIF (75 KB)
PDF (787 KB)
TIF

Constellation boundary
TXT (1 KB)

Crux

CRUCKS, CROOKS

Cru the Southern Cross Crucis

CROO-siss

Constellation charts
GIF (119 KB)
PDF (811 KB)
TIF

Constellation boundary
TXT (1 KB)

Cygnus

SIG- SIG-nu

Cyg the Swan Cygni

SIG-nye

Constellation charts
GIF (174 KB)
PDF (866 KB)
TIF

Constellation boundary
TXT (1 KB)

Delphinus

del-FINE-us, del-FIN-us

Del the Dolphin Delphini

del-FINE-eye, del-FIN-eye

Constellation charts
GIF (81 KB)
PDF (767 KB)
TIF

Constellation boundary
TXT (1 KB)

Dorado

duh-RAH-do

Dor the Swordfish Doradus

duh-RAH-dus

Constellation charts
GIF (108 KB)
PDF (795 KB)
TIF

Constellation boundary
TXT (1 KB)

Draco

DRAY-co

Dra the Dragon Draconis

druh-CONE-iss

Constellation charts
GIF (153 KB)
PDF (898 KB)
TIF

Constellation boundary
TXT (2 KB)

Equuleus

eh-QUOO-lee-us

Equ the Little Horse Equulei

eh-QUOO-lee-eye

Constellation charts
GIF (69 KB)
PDF (749 KB)
TIF

Constellation boundary
TXT (1 KB)

Eridanus

ih-RID-un-us

Eri the River Eridani

ih-RID-un-eye

Constellation charts
GIF (167 KB)
PDF (941 KB)
TIF

Constellation boundary
TXT (2 KB)

Fornax

FOR-naks

For the Furnace Fornacis

for-NAY-siss

Constellation charts
GIF (108 KB)
PDF (811 KB)
TIF

Constellation boundary
TXT (1 KB)

Gemini

JEM-uh-nye, JEM-uh-nee

Gem the Twins Geminorum

JEM-uh-NOR-um

Constellation charts
GIF (122 KB)
PDF (832 KB)
TIF

Constellation boundary
TXT (1 KB)

Grus

GRUSS, GROOS

Gru the Crane Gruis

GROO-iss

Constellation charts
GIF (127 KB)
PDF (829 KB)
TIF

Constellation boundary
TXT (1 KB)

Hercules

HER-kyuh-leez

Her the Hercules Herculis

HER-kyuh-liss

Constellation charts
GIF (156 KB)
PDF (829 KB)
TIF

Constellation boundary
TXT (1 KB)

Horologium

hor-uh-LOE-jee-um

Hor the Clock Horologii

hor-uh-LOE-jee-eye

Constellation charts
GIF (107 KB)
PDF (788 KB)
TIF

Constellation boundary
TXT (1 KB)

Hydra

HIGH-druh

Hya the Female Water Snake Hydrae

HIGH-dree

Constellation charts
GIF (127 KB)
PDF (929 KB)
TIF

Constellation boundary
TXT (2 KB)

Hydrus

HIGH-drus

Hyi the Male Water Snake Hydri

HIGH-dry

Constellation charts
GIF (143 KB)
PDF (821 KB)
TIF

Constellation boundary
TXT (1 KB)

Indus

IN-dus

Ind the Indian Indi

IN-dye

Constellation charts
GIF (131 KB)
PDF (834 KB)
TIF

Constellation boundary
TXT (1 KB)

Lacerta

luh-SER-tuh

Lac the Lizard Lacertae

luh-SER-tee

Constellation charts
GIF (124 KB)
PDF (812 KB)
TIF

Constellation boundary
TXT (1 KB)

Leo

LEE-oh

Leo the Lion Leonis

lee-OH-niss

Constellation charts
GIF (142 KB)
PDF (820 KB)
TIF

Constellation boundary
TXT (1 KB)

Leo Minor

LEE-oh MY-ner

LMi the Lesser Lion Leonis Minoris

lee-OH-niss mih-NOR-iss

Constellation charts
GIF (103 KB)
PDF (799 KB)
TIF

Constellation boundary
TXT (1 KB)

Lepus

LEEP-us, LEP-us

Lep the Hare Leporis

LEP-or-iss

Constellation charts
GIF (94 KB)
PDF (787 KB)
TIF

Constellation boundary
TXT (1 KB)

Libra

LEE-bruh, LYE-bruh

Lib the Scales Librae

LEE-bree, LYE-bree

Constellation charts
GIF (111 KB)
PDF (819 KB)
TIF

Constellation boundary
TXT (1 KB)

Lupus

LOOP-us

Lup the Wolf Lupi

LOOP-eye

Constellation charts
GIF (137 KB)
PDF (857 KB)
TIF

Constellation boundary
TXT (1 KB)

Lynx

LINKS

Lyn the Lynx Lyncis

LIN-siss

Constellation charts
GIF (111 KB)
PDF (796 KB)
TIF

Constellation boundary
TXT (1 KB)

Lyra

LYE-ruh

Lyr the Lyre Lyrae

LYE-ree

Constellation charts
GIF (91 KB)
PDF (776 KB)
TIF

Constellation boundary
TXT (1 KB)

Mensa

MEN-suh

Men the Table Mountain Mensae

MEN-see

Constellation charts
GIF (161 KB)
PDF (827 KB)
TIF

Constellation boundary
TXT (1 KB)

Microscopium

my-cruh-SCOPE-ee-um

Mic the Microscope Microscopii

my-cruh-SCOPE-ee-eye

Constellation charts
GIF (87 KB)
PDF (776 KB)
TIF

Constellation boundary
TXT (1 KB)

Monoceros

muh-NAH-ser-us

Mon the Unicorn Monocerotis

muh-NAH-ser-OH-tiss

Constellation charts
GIF (110 KB)
PDF (821 KB)
TIF

Constellation boundary
TXT (1 KB)

Musca

MUSS-cuh

Mus the Fly Muscae

MUSS-see, MUSS-kee

Constellation charts
GIF (134 KB)
PDF (828 KB)
TIF

Constellation boundary
TXT (1 KB)

Norma

NOR-muh

Nor the Carpenter’s Square Normae

NOR-mee

Constellation charts
GIF (118 KB)
PDF (803 KB)
TIF

Constellation boundary
TXT (1 KB)

Octans

OCK-tanz

Oct the Octant Octantis

ock-TAN-tiss

Constellation charts
GIF (140 KB)
PDF (821 KB)
TIF

Constellation boundary
TXT (1 KB)

Ophiuchus

OFF-ee-YOO-kus, OAF-ee-YOO-kus

Oph the Serpent Bearer Ophiuchi

OFF-ee-YOO-kye, OAF-ee-YOO-kye

Constellation charts
GIF (175 KB)
PDF (854 KB)
TIF

Constellation boundary
TXT (2 KB)

Orion

oh-RYE-un, uh-RYE-un

Ori the Hunter Orionis

or-eye-OH-niss

Constellation charts
GIF (181 KB)
PDF (873 KB)
TIF

Constellation boundary
TXT (1 KB)

Pavo

PAY-vo

Pav the Peacock Pavonis

puh-VOE-niss

Constellation charts
GIF (143 KB)
PDF (859 KB)
TIF

Constellation boundary
TXT (1 KB)

Pegasus

PEG-us-us

Peg the Winged Horse Pegasi

PEG-us-eye

Constellation charts
GIF (136 KB)
PDF (868 KB)
TIF

Constellation boundary
TXT (2 KB)

Perseus

PER-see-us, PER-syoos

Per the Hero Persei

PER-see-eye

Constellation charts
GIF (127 KB)
PDF (836 KB)
TIF

Constellation boundary
TXT (1 KB)

Phoenix

FEE-nix

Phe the Phoenix

 

Phoenicis

fuh-NICE-iss

Constellation charts
GIF (119 KB)
PDF (828 KB)
TIF

Constellation boundary
TXT (1 KB)

Pictor

PICK-ter

Pic the Painter’s Easel Pictoris

pick-TOR-iss

Constellation charts
GIF (108 KB)
PDF (794 KB)
TIF

Constellation boundary
TXT (1 KB)

Pisces

PICE-eez, PISS-eez

Psc the Fishes Piscium

PICE-ee-um, PISH-ee-um

Constellation charts
GIF (87 KB)
PDF (859 KB)
TIF

Constellation boundary
TXT (1 KB)

Piscis Austrinus

PICE-iss (PISS-iss) aw-STRY-nus

PsA the Southern Fish Piscis Austrini

PICE-iss (PISS-iss) aw-STRY-nye

Constellation charts
GIF (87 KB)
PDF (778 KB)
TIF

Constellation boundary
TXT (1 KB)

Puppis

PUP-iss

Pup the Stern Puppis

PUP-iss

Constellation charts
GIF (185 KB)
PDF (868 KB)
TIF

Constellation boundary
TXT (1 KB)

Pyxis

PIX-iss

Pyx the Compass Pyxidis

PIX-ih-diss

Constellation charts
GIF (84 KB)
PDF (775 KB)
TIF

Constellation boundary
TXT (1 KB)

Reticulum

rih-TICK-yuh-lum

Ret the Reticle Reticuli

rih-TICK-yuh-lye

Constellation charts
GIF (107 KB)
PDF (786 KB)
TIF

Constellation boundary
TXT (1 KB)

Sagitta

suh-JIT-uh

Sge the Arrow Sagittae

suh-JIT-ee

Constellation charts
GIF (90 KB)
PDF (773 KB)
TIF

Constellation boundary
TXT (1 KB)

Sagittarius

SAJ-ih-TARE-ee-us

Sgr the Archer Sagittarii

SAJ-ih-TARE-ee-eye

Constellation charts
GIF (163 KB)
PDF (878 KB)
TIF

Constellation boundary
TXT (1 KB)

Scorpius

SCOR-pee-us

Sco the Scorpion Scorpii

SCOR-pee-eye

Constellation charts
GIF (194 KB)
PDF (874 KB)
TIF

Constellation boundary
TXT (1 KB)

Sculptor

SCULP-ter

Scl the Sculptor Sculptoris

sculp-TOR-iss

Constellation charts
GIF (119 KB)
PDF (810 KB)
TIF

Constellation boundary
TXT (1 KB)

Scutum

SCOOT-um, SCYOOT-um

Sct the Shield Scuti

SCOOT-eye, SCYOOT-eye

Constellation charts
GIF (120 KB)
PDF (784 KB)
TIF

Constellation boundary
TXT (1 KB)

Serpens

SER-punz

Ser the Serpent Serpentis

ser-PEN-tiss

Constellation charts (Serpens Caput)
GIF (112 KB)
PDF (780 KB)
TIF

Constellation boundary (Serpens Caput)
TXT (1 KB)

Constellation charts (Serpens Cauda)
GIF (126 KB)
PDF (791 KB)
TIF

Constellation boundary (Serpens Cauda)
TXT (1 KB)

Sextans

SEX-tunz

Sex the Sextant Sextantis

sex-TAN-tiss

Constellation charts
GIF (83 KB)
PDF (782 KB)
TIF

Constellation boundary
TXT (1 KB)

Taurus

TOR-us

Tau the Bull Tauri

TOR-eye

Constellation charts
GIF (115 KB)
PDF (832 KB)
TIF

Constellation boundary
TXT (1 KB)

Telescopium Tel the Telescope Telescopii Constellation charts
GIF (148 KB)
PDF (834 KB)
TIF

Constellation boundary
TXT (1 KB)

Triangulum

try-ANG-gyuh-lum

Tri the Triangle Trianguli

try-ANG-gyuh-lye

Constellation charts
GIF (89 KB)
PDF (764 KB)
TIF

Constellation boundary
TXT (1 KB)

Triangulum Australe

try-ANG-gyuh-lum aw-STRAL-ee

TrA the Southern Triangle Trianguli Australis

try-ANG-gyuh-lye aw-STRAL-iss

Constellation charts
GIF (124 KB)
PDF (815 KB)
TIF

Constellation boundary
TXT (1 KB)

Tucana

too-KAY-nuh, too-KAH-nuh

Tuc the Toucan Tucanae

too-KAY-nee, too-KAH-nee

Constellation charts
GIF (127 KB)
PDF (806 KB)
TIF

Constellation boundary
TXT (1 KB)

Ursa Major

ER-suh MAY-jur

UMa the Great Bear Ursae Majoris

ER-suh muh-JOR-iss

Constellation charts
GIF (174 KB)
PDF (885 KB)
TIF

Constellation boundary
TXT (1 KB)

Ursa Minor

ER-suh MY-ner

UMi the Little Bear Ursae Minoris

ER-suh mih-NOR-iss

Constellation charts
GIF (135 KB)
PDF (800 KB)
TIF

Constellation boundary
TXT (1 KB)

Vela

VEE-luh, VAY-luh

Vel the Sails Velorum

vee-LOR-um, vuh-LOR-um

Constellation charts
GIF (131 KB)
PDF (850 KB)
TIF

Constellation boundary
TXT (1 KB)

Virgo

VER-go

Vir the Maiden Virginis

VER-jin-iss

Constellation charts
GIF (98 KB)
PDF (831 KB)
TIF

Constellation boundary
TXT (1 KB)

Volans

VOH-lanz

Vol the Flying Fish Volantis

vo-LAN-tiss

Constellation charts
GIF (123 KB)
PDF (812 KB)
TIF

Constellation boundary
TXT (1 KB)

Vulpecula

vul-PECK-yuh-luh

Vul the Fox Vulpeculae

vul-PECK-yuh-lee

Constellation charts
GIF (124 KB)
PDF (805 KB)
TIF

Constellation boundary
TXT (1 KB)


Charts Text Legend

Each constellation comes with the following basic information:

  1. Name
  2. Pronunciation of the name
  3. Abbreviation
  4. English Name
  5. Genitive
  6. Pronunciation of the genitive
  7. Chart for screen view (GIF)
  8. Chart for printing (PDF in A4 format)
  9. Boundary coordinates (TXT)

Explanation of the fields:

  1. The name is the Latin name adopted by the International Astronomical Union in 1930.
  2. Pronunciation as described above.
  3. Abbreviation, the standard three-letter form of the Latin name.
  4. The popular name in English.
  5. The genitive is the possessive form of the constellation’s name in Latin. For example, alpha Orionis is the alpha star in the constellation of Orion.
  6. Pronunciation as described above.
  7. Chart in GIF format, 1000 pixels wide.
  8. Chart in PDF format, to be printed in A4 format.
  9. A text file containing a set of coordinates that defines the boundaries of the constellations in the sky. The format is:
    HH MM SS.SSSS| DD.DDDDDDD|XXX

    Where:
    HH MM SS.SSSS defines the right ascension hour, minute and second with J2000 coordinates
    DD.DDDDDDD defines the declination with J2000 coordinates
    XXX is the abbreviation of the constellation name
    | is the separator of the fields

    Example:
    22 57 51.6729| 35.1682358|AND

Source: The Constellations | IAU