Medusa Galaxy Merger
Scientific overview
Medusa Galaxy Merger is a barred spiral galaxy in the constellation Ursa Major. It shines at apparent magnitude 12.77 and spans about 1.64 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 and redshift from NED · NGC 4194
| Distance | 1.2753e+8 ly | SIMBAD · catalogued |
| Physical size (major axis) | 60,838 ly | SIMBAD · derived |
| Physical size (minor axis) | 42,290 ly | SIMBAD · derived |
| Redshift (z) | 0.008342 ± 3.0000e-6 | NED · catalogued |
| Radial velocity | 2,564 km/s | SIMBAD · measured |
| Right ascension (ICRS) | 183.540063 deg | SIMBAD · measured |
| Declination (ICRS) | 54.526646 deg | SIMBAD · measured |
Full field-level provenance
- Distance: Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · mesDistance · dist · 2019A&A...631A..38L · distance indicator: redshift · catalogued value · source value 39.1 Mpc · retrieved 2026-07-11
- Physical size (major axis): Centre de données astronomiques de Strasbourg (CDS) · derived (OpenNGC angular size × SIMBAD distance) · physical size = angular size × distance (small-angle); angular size from OpenNGC, distance from SIMBAD mesDistance · derived · retrieved 2026-07-11
- Physical size (minor axis): Centre de données astronomiques de Strasbourg (CDS) · derived (OpenNGC angular size × SIMBAD distance) · physical size = angular size × distance (small-angle); angular size from OpenNGC, distance from SIMBAD mesDistance · derived · retrieved 2026-07-11
- Redshift (z): NASA/IPAC Extragalactic Database · NED · ObjectLookup · Redshift · 2006AJ....131..185R · catalogued value · NED quality UUN · retrieved 2026-07-11
- Radial velocity: Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · rvz_radvel · 2016ApJS..226...11S · direct catalogue measurement · retrieved 2026-07-11
- Right ascension (ICRS): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · ra · 2015ApJS..219...12A · direct catalogue measurement · retrieved 2026-07-11
- Declination (ICRS): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · dec · 2015ApJS..219...12A · 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). Redshift is the object's measured redshift — a negative value is a blueshift (the galaxy is approaching, its motion dominated by local rather than cosmic expansion). Fields a source did not provide are omitted, never invented.
Other objects in Ursa Major
| Object | Type | Mag | Size (′) |
|---|---|---|---|
| Bode's GalaxyM 81 · NGC 3031 | Spiral galaxy | 6.92 | 21.63 |
| M 101M 101 · NGC 5457 | Barred spiral galaxy | 7.9 | 23.99 |
| Cigar GalaxyM 82 · NGC 3034 | Spiral galaxy | 8.3 | 10.99 |
| NGC 3184NGC 3184 | Barred spiral galaxy | 9.84 | 7.4 |
| NGC 2768NGC 2768 | Elliptical galaxy | 9.87 | 5.64 |
| M 109M 109 · NGC 3992 | Spiral galaxy | 9.88 | 8.07 |
| NGC 3077NGC 3077 | Spiral galaxy | 9.88 | 5.21 |
| Owl NebulaM 97 · NGC 3587 | Planetary nebula | 9.9 | 3.58 |
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.