M 9
Scientific overview
M 9 is a globular cluster in the constellation Ophiuchus. It shines at apparent magnitude 8.42 and spans about 6.9 arcminutes of sky.
Observation guide
Guidance follows standard observing practice, derived from the object's real magnitude and position. A dark, moonless sky always helps.
Location in the sky
Precision measurements
Distances and velocities from SIMBAD · M 9
| Radial velocity | 310.75 ± 2.12 km/s | SIMBAD · measured |
| Right ascension (ICRS) | 259.799083 deg | SIMBAD · measured |
| Declination (ICRS) | -18.51625 deg | SIMBAD · measured |
Full field-level provenance
- Radial velocity: Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · rvz_radvel · 2019MNRAS.482.5138B · direct catalogue measurement · retrieved 2026-07-11
- Right ascension (ICRS): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · ra · 2002MNRAS.332..441F · direct catalogue measurement · retrieved 2026-07-11
- Declination (ICRS): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · dec · 2002MNRAS.332..441F · direct catalogue measurement · retrieved 2026-07-11
Physical size is derived from the OpenNGC angular size and the catalogued distance (small-angle: size = angle × distance). This is a Galactic object: its Doppler shift is shown as a radial velocity, not a cosmological redshift. Fields a source did not provide are omitted, never invented.
Other objects in Ophiuchus
| Object | Type | Mag | Size (′) |
|---|---|---|---|
| IC 4665 | Open cluster | 4.2 | 24.6 |
| NGC 6633NGC 6633 | Open cluster | 4.6 | 12 |
| M 10M 10 · NGC 6254 | Globular cluster | 4.98 | 9.3 |
| rho Oph Nebula | Nebula | 5.1 | 60 |
| M 19M 19 · NGC 6273 | Globular cluster | 5.57 | 7.5 |
| M 14M 14 · NGC 6402 | Globular cluster | 5.73 | 9.9 |
| M 12M 12 · NGC 6218 | Globular cluster | 6.07 | 11.1 |
| NGC 6235NGC 6235 | Globular cluster | 7.2 | 4.2 |
Sources
The primary and reference sources this topic draws on.
- OpenNGCOpenNGC (M. Verga) — NGC/IC, Messier, and Caldwell catalogue data
Openly-licensed deep-sky catalogue: object types, positions, magnitudes, sizes, morphology, and cross-identifiers.