Hercules Constellation Guide & Objects
Hercules IAU constellation guide: Keystone asterism navigation, area (1225 sq deg), best summer visibility, and deep-sky targets M13 and M92.
IAU Constellations & Sky Navigation Guide
Constellations divide the celestial sphere into 88 official solid-angle regions standardized by the International Astronomical Union (IAU). Each profile below provides three-letter IAU codes, Latin genitives, solid-angle areas in square degrees, culmination months, and links to cataloged stars and deep-sky objects.
IAU Constellation Summary Table
| Constellation | IAU Code | Genitive | Hemisphere | Area (sq deg) | IAU Rank | Best Month | Brightest Star |
|---|---|---|---|---|---|---|---|
| Hercules | Her | Herculis | Northern | 1225 | #5 | July | Kornephoros (Beta Herculis) (+2.77) |
| Orion | Ori | Orionis | Equatorial | 594 | #26 | January | Rigel (Beta Orionis) (+0.13) |
| Cygnus | Cyg | Cygni | Northern | 804 | #16 | September | Deneb (Alpha Cygni) (+1.25) |
| Lyra | Lyr | Lyrae | Northern | 286 | #52 | August | Vega (Alpha Lyrae) (+0.026) |
| Andromeda | And | Andromedae | Northern | 722 | #19 | November | Alpheratz (Alpha Andromedae) (+2.06) |
| Sagittarius | Sgr | Sagittarii | Southern | 867 | #15 | August | Kaus Australis (Epsilon Sagittarii) (+1.85) |
| Scorpius | Sco | Scorpii | Southern | 497 | #33 | July | Antares (Alpha Scorpii) (+0.96) |
| Taurus | Tau | Tauri | Northern | 797 | #17 | January | Aldebaran (Alpha Tauri) (+0.86) |
| Ursa Major | UMa | Ursae Majoris | Northern | 1280 | #3 | April | Alioth (Epsilon Ursae Majoris) (+1.77) |
| Ursa Minor | UMi | Ursae Minoris | Northern | 256 | #56 | June | Polaris (Alpha Ursae Minoris) (+1.98) |
| Cassiopeia | Cas | Cassiopeiae | Northern | 598 | #25 | November | Schedar (Alpha Cassiopeiae) (+2.24) |
| Centaurus | Cen | Centauri | Southern | 1060 | #9 | May | Alpha Centauri (Rigil Kentaurus) (−0.27) |
| Canis Major | CMa | Canis Majoris | Southern | 380 | #43 | February | Sirius (Alpha Canis Majoris) (−1.46) |
| Perseus | Per | Persei | Northern | 615 | #24 | December | Mirfak (Alpha Persei) (+1.79) |
| Virgo | Vir | Virginis | Equatorial | 1294 | #2 | May | Spica (Alpha Virginis) (+0.97) |
| Carina | Car | Carinae | Southern | 494 | #34 | March | Canopus (Alpha Carinae) (−0.74) |
Constellation Navigation Profiles
Orion Constellation Guide & Deep-Sky Map
Orion IAU constellation guide: Belt and Sword navigation, area (594 sq deg), winter culmination, and flagship targets M42, Rigel, and Betelgeuse.
Cygnus Constellation Guide & Objects
Cygnus IAU constellation guide: Northern Cross navigation along the Milky Way rift, area (804 sq deg), and targets Albireo, Veil Nebula, and Cygnus X-1.
Lyra Constellation Guide & Deep-Sky Map
Lyra IAU constellation guide: compact 286 sq deg summer constellation hosting zero-point star Vega, the Ring Nebula (M57), and Double Double (Epsilon Lyrae).
Andromeda Constellation Guide & Galaxies
Andromeda IAU constellation guide: autumn star chains from the Great Square of Pegasus to the Andromeda Galaxy (M31) and neighbouring Triangulum (M33).
Sagittarius Constellation & Galactic Center
Sagittarius IAU constellation guide: Teapot asterism, Galactic Center direction, Lagoon Nebula (M8), Sagittarius A*, and rich summer Milky Way star fields.
Scorpius Constellation Guide & Targets
Scorpius IAU constellation guide: J-shaped fishhook of the southern ecliptic, Antares heart, and Milky Way border targets near Sagittarius and Centaurus.
Taurus Constellation Guide: M45, Hyades & M1
Taurus IAU constellation guide: home of the Pleiades (M45), Hyades V-shaped cluster, Aldebaran, and the Crab Nebula (M1) supernova remnant and pulsar.
Ursa Major Constellation Guide & Galaxies
Ursa Major IAU constellation guide: third-largest constellation (1280 sq deg), Big Dipper navigation, Mizar & Alcor, and galaxies M81, M82, and M51.
Ursa Minor Constellation & North Star Guide
Ursa Minor IAU constellation guide: Little Dipper asterism, North Celestial Pole navigation, Polaris (Alpha Ursae Minoris), and limiting-magnitude stars.
Cassiopeia Constellation Guide & Objects
Cassiopeia IAU constellation guide: W-shaped circumpolar asterism in the northern Milky Way, hosting Cassiopeia A and pointing to the Double Cluster.
Centaurus Constellation Guide & Objects
Centaurus IAU constellation guide: giant southern constellation (1060 sq deg) hosting Omega Centauri, Alpha Centauri, Proxima Centauri, and Proxima b.
Canis Major Constellation & Sirius Guide
Canis Major IAU constellation guide: winter constellation south of Orion hosting Sirius (Alpha Canis Majoris, V = -1.46), the brightest star in the night sky.
Perseus Constellation: Algol & Double Cluster
Perseus IAU constellation guide: autumn/winter Milky Way constellation hosting the Double Cluster (NGC 869/884) and the eclipsing binary Algol (Beta Persei).
Virgo Constellation & Galaxy Cluster Guide
Virgo IAU constellation guide: second-largest constellation (1294 sq deg), hosting Spica, the Virgo Cluster giant elliptical M87, M104, and quasar 3C 273.
Carina Constellation: Eta Carinae & NGC 3372
Carina IAU constellation guide: southern Milky Way keel of Argo Navis hosting Canopus, the Carina Nebula (NGC 3372), and hypergiant system Eta Carinae.