Messier Catalog (M) Objects & Cross-Reference
The premier northern and equatorial visual deep-sky catalog, containing bright nebulae, supernova remnants, open clusters, globular clusters, and nearby galaxies.
Catalog Scope & Cross-Identification Notes
Compiled in Paris by comet hunter Charles Messier and his colleague Pierre Méchain between 1771 and 1781, the Catalogue des Nébuleuses et des Amas d'Étoiles was originally intended to prevent observers from mistaking fixed fuzzy nebulae for new comets in small 50–90 mm refractors and reflectors.
Because Messier worked from latitude +48.8°N with modest instruments, the resulting 110 objects naturally select the brightest and most visually rewarding deep-sky showpieces north of declination −35°. Every Messier object in FastAstro is cross-indexed to its Dreyer NGC number, IAU constellation, and modern Gaia DR3 or Cepheid/TRGB distance.
Cross-Referenced Objects in Messier Catalog (M) Objects & Cross-Reference (16)
| Object Profile | Primary Class | Constellation | RA (J2000) | Dec (J2000) | Catalog Aliases | Best Season |
|---|---|---|---|---|---|---|
| Crab Nebula (Messier 1 Supernova Remnant) | Pulsar wind nebula (plerion) and core-collapse supernova remnant | Taurus | 05h 34m 31.94s | +22° 00′ 52.2″ | M1, NGC 1952, Taurus A | Late Autumn to Winter (November–March) |
| Lagoon Nebula (Messier 8 / NGC 6523) | Giant H II emission nebula with embedded open cluster NGC 6530 | Sagittarius | 18h 03m 47.00s | -24° 23′ 12.0″ | M8, NGC 6523, NGC 6530 | Summer (June–August) |
| Messier 13 (Hercules Globular Cluster) | Globular cluster | Hercules | 16h 41m 41.24s | +36° 27′ 35.5″ | M13, NGC 6205, Hercules Globular Cluster | Late Spring to Summer (May–August) |
| Dumbbell Nebula (Messier 27 in Vulpecula) | Planetary nebula (bipolar lobe system viewed equator-on) | Vulpecula (Summer Triangle) | 19h 59m 36.34s | +22° 43′ 16.1″ | M27, NGC 6853, Apple Core Nebula | Summer to Autumn (July–October) |
| Andromeda Galaxy (Messier 31 / NGC 224) | Barred spiral galaxy (Local Group largest spiral) | Andromeda | 00h 42m 44.33s | +41° 16′ 07.5″ | M31, NGC 224, UGC 454 | Autumn to Early Winter (September–January) |
| Triangulum Galaxy (Messier 33 / NGC 598) | Late-type unbarred spiral galaxy (3rd largest Local Group member) | Triangulum | 01h 33m 50.89s | +30° 39′ 35.8″ | M33, NGC 598, Pinwheel Galaxy in Triangulum | Autumn to Early Winter (September–January) |
| Orion Nebula (Messier 42 / NGC 1976) | Diffuse H II emission and reflection nebula | Orion | 05h 35m 17.30s | -05° 23′ 28.0″ | M42, NGC 1976, Great Nebula in Orion | Winter (December–March) |
| Beehive Cluster (Messier 44 Praesepe) | Open star cluster | Cancer | 08h 40m 24.00s | +19° 40′ 00.0″ | M44, Praesepe, NGC 2632 | Late Winter to Spring (February–May) |
| Pleiades (Messier 45 Open Cluster) | Open star cluster with dusty reflection nebulosity | Taurus | 03h 47m 00.00s | +24° 07′ 00.0″ | M45, Seven Sisters, Melotte 22 | Late Autumn to Winter (November–February) |
| Whirlpool Galaxy (Messier 51 / NGC 5194) | Interacting grand-design spiral galaxy pair | Canes Venatici | 13h 29m 52.70s | +47° 11′ 42.9″ | M51, NGC 5194, NGC 5195 | Spring to Early Summer (March–July) |
| Ring Nebula (Messier 57 in Lyra) | Planetary nebula (bipolar barrel viewed nearly pole-on) | Lyra | 18h 53m 35.08s | +33° 01′ 45.0″ | M57, NGC 6720 | Summer to Early Autumn (June–October) |
| Bode's Galaxy (Messier 81 / NGC 3031) | Grand-design spiral galaxy (dominant member of the M81 Group) | Ursa Major | 09h 55m 33.17s | +69° 03′ 55.0″ | M81, NGC 3031 | Late Winter to Spring (February–June; circumpolar from mid-northern latitudes) |
| Cigar Galaxy (Messier 82 Starburst Galaxy) | Prototype edge-on starburst galaxy with bipolar superwind | Ursa Major | 09h 55m 52.43s | +69° 40′ 46.9″ | M82, NGC 3034, 3C 231 | Late Winter to Spring (February–June) |
| Messier 87 (Virgo A Giant Elliptical Galaxy) | Supergiant cD elliptical galaxy & active galactic nucleus (Virgo Cluster center) | Virgo | 12h 30m 49.42s | +12° 23′ 28.0″ | M87, Virgo A, NGC 4486 | Spring (March–June) |
| Messier 92 (NGC 6341 in Hercules) | Globular cluster | Hercules | 17h 17m 07.40s | +43° 08′ 09.4″ | M92, NGC 6341 | Late Spring to Summer (May–August) |
| Sombrero Galaxy (Messier 104 / NGC 4594) | Unbarred early-type spiral / lenticular-halo galaxy with edge-on dust ring | Virgo | 12h 39m 59.43s | -11° 37′ 23.0″ | M104, NGC 4594 | Spring (April–June) |
Related Reference Guides
Astronomical Catalogs Explained (M, NGC, Gaia)
How astronomical designations work across the Messier (M), NGC/IC, Bayer/Flamsteed, Henry Draper (HD), Hipparcos (HIP), and Gaia DR3 catalogs.
Surface Brightness & Extended Objects Guide
Why surface brightness (mag/arcsec²) governs nebula and galaxy visibility more than integrated magnitude, and how exit pupil controls eyepiece contrast.
Apparent vs Absolute Magnitude Explained
Understand the logarithmic Pogson astronomical magnitude scale, apparent visual magnitude (m), absolute magnitude (M at 10 parsecs), and bolometric corrections.
Primary Catalog Sources
- Revised New General Catalogue and Index Catalogue (RNGC/IC) (2024/2026 edition): Steinicke, W. 2010, Observing and Cataloguing Nebulae and Star Clusters (Cambridge Univ. Press); Verga, M. OpenNGC (CC-BY-SA 4.0 / data tables) — Wolfgang Steinicke / OpenNGC
- SIMBAD Astronomical Database (CDS) (2026-10 release): Wenger, M., et al. 2000, A&AS, 143, 9 (The SIMBAD astronomical database) — Centre de Données astronomiques de Strasbourg
- ESA Gaia Archive — Data Release 3 (DR3 (2022-06-13)): Gaia Collaboration, Vallenari, A., et al. 2023, A&A, 674, A1 (Gaia Data Release 3) — European Space Agency / Gaia DPAC