Messier 49 (NGC 4472 / Arp 134)
J2000 coordinates, SBF distance (55.9 Mly), magnitude 8.40, globular cluster halo, X-ray bow shock, and observing guide for Messier 49 in Virgo.
Provenance-Backed Scientific Measurements
Every measurement below preserves its unit, uncertainty interval, observational method, reference epoch, quality status, and primary catalog source. See Uncertainty & Provenance for how competing measurements are handled.
| Parameter | Value | Uncertainty | Method & Epoch | Quality Status | Source Archive |
|---|---|---|---|---|---|
| Integrated visual magnitude (V) | 8.4 mag | ± 0.08 mag | Wide-aperture CCD surface photometry | definitive | Revised New General Catalogue and Index Catalogue (RNGC/IC) |
| Distance in light-years | 55900000 ly | ± 1900000 ly | HST ACS Virgo Cluster Survey surface-brightness fluctuations (17.14 ± 0.58 Mpc) | definitive | SH0ES Local Distance Ladder Hubble Constant |
| Apparent major axis | 10.2 arcmin | ± 0.5 arcmin | Optical isophotal dimensions (10.2′ × 8.3′) | definitive | Revised New General Catalogue and Index Catalogue (RNGC/IC) |
| Heliocentric recession velocity | 981 km/s | ± 5 km/s | Optical stellar absorption spectroscopy | definitive | SIMBAD Astronomical Database (CDS) |
J2000 Equatorial Sky Chart & Culmination Altitude
The chart below plots Messier 49 (NGC 4472 Virgo Giant Elliptical) at RA 12h 29m 46.80s, Dec +08° 00′ 01.5″ within Virgo, alongside peak meridian transit altitudes for 40°N and 30°S observers. Use the RA/Dec Coordinate Converter to compute exact culmination altitude for your latitude.
Astrophysical Context & Structure
Found by Charles Messier on February 19, 1771, Messier 49 (NGC 4472) holds two historic distinctions: it was the very first member of the Virgo Galaxy Cluster ever discovered and the first elliptical galaxy outside the Local Group ever recorded. Shining at integrated magnitude 8.40 from a distance of 55.9 million light-years, M49 is optically the most luminous galaxy in the entire Virgo Cluster—slightly outshining even central Messier 87 in visual starlight—and anchors the dynamical center of the southern 'Virgo B' subcluster located 4.3 degrees south of M87.
Spanning more than 160,000 light-years across its stellar envelope, M49 hosts an estimated 5,900 globular clusters and a central supermassive black hole of roughly 2.5 billion solar masses. Chandra and XMM-Newton X-ray observations reveal a sharp thermodynamic bow shock along M49's northern edge, demonstrating that the entire galaxy and its surrounding halo of 10-million-kelvin gas are plunging northward into the main Virgo A intracluster medium at more than 1,000 kilometers per second.
Halton Arp cataloged M49 as Arp 134 because it is actively tidally shredding the gas-rich dwarf irregular galaxy UGC 7636 located 5.5 arcminutes to its southeast. Neutral hydrogen and optical debris stripped from UGC 7636 trail across the space between the two systems, where supernova SN 1969Q was also observed inside M49's outer halo.
Practical Visual Observing Guide
- Located 4.1° west-southwest of Vindemiatrix (ε Virginis), forming the southern apex of the main Virgo realm of galaxies.
- As the brightest galaxy in Virgo (V = 8.4), M49 is visible in 10×50 binoculars under dark skies and stands out immediately in a 60–80 mm refractor as a luminous, condensed circular glow.
- In 200–250 mm telescopes at 100×–160×, M49 shows a brilliant core fading smoothly into an 8′×6′ oval halo, flanked within the same field by faint dwarf galaxies NGC 4465, NGC 4467, and NGC 4470.
Catalog Cross-Identifications & Aliases
Common Aliases: M49 · NGC 4472 · UGC 7629 · Arp 134
| Catalog Authority | Identifier |
|---|---|
| MESSIER | M 49 |
| NGC | NGC 4472 |
| SIMBAD | M 49 |
| WIKIDATA | Q13951 |
Related Objects, Comparisons & Guides
Messier 87 (Virgo A Giant Elliptical Galaxy)
Coordinates, distance (16.4 Mpc / 53.5 Mly), EHT 6.5-billion M☉ black hole M87*, relativistic jet, and observing guide for Messier 87.
Messier 60 (NGC 4649 Giant Elliptical Pair)
J2000 coordinates, SBF distance (54.8 Mly), magnitude 8.80, 4.5-billion-M☉ black hole, NGC 4647 companion, and observing guide for Messier 60.
Messier 61 (NGC 4303 Supernova-Rich Spiral)
J2000 coordinates, distance (52.5 Mly), magnitude 9.65, nuclear starburst ring, eight recorded supernovae, and observing guide for Messier 61.
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.
Measurement Uncertainty & Optics in Astronomy
How random vs systematic errors, asymmetric error bars, model dependencies, and optical aperture/exit-pupil limits shape astronomical measurements.
Scientific Sources & Dataset Provenance
- 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
- 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)
- 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