Local Group & Virgo Cluster Galaxies Catalog
Extragalactic reference index spanning nearby resolved spirals, starburst interactions, and Virgo Cluster ellipticals.
Catalog Scope & Cross-Identification Notes
Beyond the Milky Way's stellar halo lies the Local Group—dominated by the Andromeda Galaxy (M31) at 778 kpc and the Triangulum Galaxy (M33) at 859 kpc—followed by nearby galaxy groups in Ursa Major (M81/M82), Canes Venatici (M51), and the rich Virgo Cluster core centered on Messier 87 at 16.4 Mpc.
Every galaxy in this catalog links its morphological Hubble-de Vaucouleurs class and integrated surface brightness to modern Cepheid, Tip of the Red Giant Branch (TRGB), or Surface Brightness Fluctuation (SBF) distance measurements.
Cross-Referenced Objects in Local Group & Virgo Cluster Galaxies Catalog (7)
| Object Profile | Primary Class | Constellation | RA (J2000) | Dec (J2000) | Catalog Aliases | Best Season |
|---|---|---|---|---|---|---|
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
Related Reference Guides
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.
Proper Motion, Radial Velocity & Redshift
How astronomers combine tangential proper motion (mas/yr), Doppler radial velocity (km/s), and cosmological redshift (z) to reconstruct 3D space motion.
Measurement Uncertainty & Optics in Astronomy
How random vs systematic errors, asymmetric error bars, model dependencies, and optical aperture/exit-pupil limits shape astronomical measurements.
Primary Catalog Sources
- SH0ES Local Distance Ladder Hubble Constant (2022 Baseline Cepheid + SN Ia): Riess, A. G., et al. 2022, ApJL, 934, L7 (A Comprehensive Measurement of the Local Value of the Hubble Constant) — SH0ES Collaboration (HST / JWST)
- 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