Messier 53 (NGC 5024)
Coordinates, Gaia DR3 distance (18.50 kpc), magnitude 7.61, Helmi Stream origin, and observing guide for Messier 53 in Coma Berenices.
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) | 7.61 mag | ± 0.05 mag | Integrated photoelectric & CCD photometry | definitive | Catalog of Parameters for Milky Way Globular Clusters |
| Heliocentric distance | 60300 ly | ± 1200 ly | Gaia EDR3 + RR Lyrae P-L relation (18.50 ± 0.36 kpc) (J2016.0) | high-confidence | ESA Gaia Archive — Data Release 3 |
| Apparent tidal diameter | 13 arcmin | ± 1 arcmin | Outer surface-density profile fitting | high-confidence | Revised New General Catalogue and Index Catalogue (RNGC/IC) |
| Isochrone turnoff age | 12.8 Gyr | ± 0.5 Gyr | HST ACS main-sequence turnoff calibration | model-dependent | Catalog of Parameters for Milky Way Globular Clusters |
J2000 Equatorial Sky Chart & Culmination Altitude
The chart below plots Messier 53 (NGC 5024 Outer Halo Globular) at RA 13h 12m 55.25s, Dec +18° 10′ 05.4″ within Coma Berenices, 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
Messier 53 (NGC 5024) is one of the most remote globular clusters in the Messier catalog, orbiting in the outer Milky Way halo 60,300 light-years (18.50 ± 0.36 kiloparsecs) from the Sun and roughly 61,600 light-years from the Galactic center in Coma Berenices. Discovered by Johann Elert Bode on February 3, 1775, and independently recovered by Charles Messier in February 1777, M53 is intrinsically a monster system—spanning 220 light-years across and shining with the luminosity of ~275,000 Suns.
Only 1 degree southeast of M53 on the sky sits the faint, extremely loose globular cluster NGC 5053, which lies at nearly the same distance (~57,000 light-years). Deep wide-field star counts and Gaia DR3 proper motions show that M53 and NGC 5053 are linked by a tidal bridge and share orbital phase-space coordinates with the Helmi Stream or Pontus dwarf galaxy accretion event.
With a very low iron abundance of [Fe/H] = −2.10 dex (~0.8% solar), M53 is a classic Oosterhoff Type II metal-poor cluster hosting more than 60 RR Lyrae variables, dozens of blue stragglers, and the long-period binary millisecond pulsar PSR B1310+18.
Practical Visual Observing Guide
- Exceptionally easy to find just 1.0° northeast of the 4.3-magnitude binary star Diadem (α Comae Berenices), fitting inside the same low-power eyepiece field.
- In 10×50 binoculars or small 80 mm telescopes, M53 is a smooth, bright Class V snowball with a strongly concentrated center, while its 13.8-magnitude red giants require larger apertures.
- Use a 200–250 mm telescope at 160×–220× to resolve the granular outer halo of M53, then pan 1° southeast under dark skies to test your skills on the ghostly 9.5-magnitude glow of NGC 5053.
Catalog Cross-Identifications & Aliases
Common Aliases: M53 · NGC 5024
| Catalog Authority | Identifier |
|---|---|
| MESSIER | M 53 |
| NGC | NGC 5024 |
| SIMBAD | M 53 |
| WIKIDATA | Q11457 |
Related Objects, Comparisons & Guides
Messier 3 (NGC 5272 Globular Cluster)
Coordinates, Gaia DR3 distance (10.18 kpc), magnitude 6.19, RR Lyrae variable benchmark data, and observing guide for Messier 3 in Canes Venatici.
Messier 68 (NGC 4590 Hydra Globular Cluster)
Coordinates, Gaia DR3 distance (10.40 kpc), magnitude 7.84, Fimbulthul tidal stream, and observing guide for Messier 68 in Hydra.
Messier 92 (NGC 6341 in Hercules)
Coordinates, Gaia distance (8.50 kpc), metal-poor [Fe/H] = −2.31 dex, and observing guide for ancient globular cluster Messier 92 in Hercules.
Trigonometric Parallax, Parsecs & Gaia DR3
How trigonometric parallax (d_pc = 1 / p_arcsec), the distance modulus equation, Hipparcos, and Gaia DR3 microarcsecond astrometry measure cosmic distances.
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.
Scientific Sources & Dataset Provenance
- Catalog of Parameters for Milky Way Globular Clusters (2010 / 2021 Gaia EDR3 revision): Harris, W. E. 1996 (2010 ed.), AJ, 112, 1487; Vasiliev, E. & Baumgardt, H. 2021, MNRAS, 505, 5978 — McMaster University / Gaia EDR3 Cluster Survey
- 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
- 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