| Emission nebula | |
|---|---|
| H II region | |
_(weic2407a).jpg) | |
| Observation data:J2000epoch | |
| Right ascension | 01h 34m 33.2s[1] |
| Declination | +30° 47′ 06″[1] |
| Distance | 2,700,000 ly (840,000[2] pc) |
| Apparent magnitude (V) | +14.0[1] |
| Apparent dimensions (V) | 1.93′ x 1.2′arcmins[1] |
| Constellation | Triangulum |
| Physical characteristics | |
| Radius | 760[3] ly |
| Absolute magnitude (V) | -13.8 |
| Notable features | massiveH II region 3.5 million years old[2] |
| See also:Lists of nebulae | |
NGC 604 is anH II region inside theTriangulum Galaxy. It was discovered byWilliam Herschel on September 11, 1784. It is among thelargest H II regions in theLocal Group of galaxies; at the galaxy's estimated distance of 2.7 millionlight-years, its longest diameter is roughly 1,520 light years (~460parsecs), over 40 times the size of the visible portion of theOrion Nebula. It is over 6,300 times moreluminous than theOrion Nebula, and if it were at the same distance it would outshineVenus. Its gas isionized by a cluster of massivestars at its center[4] with 200 stars of spectral typeO andWR, a mass of 105solar masses, and an age of 3.5 million years;[2] however, unlike theLarge Magellanic Cloud'sTarantula Nebula central cluster (R136), NGC 604's one is much less compact and more similar to a largestellar association.[5]
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| Location | Triangulum Galaxy →Triangulum subgroup →Local Group→Local Sheet→Local Volume→Virgo Supercluster→Laniakea Supercluster →Pisces–Cetus Supercluster Complex →Local Hole →Observable universe →Universe Each arrow (→) may be read as "within" or "part of". |  |
|---|---|---|
| H II regions | ||
| Suspectedsatellite galaxies | ||
| Catalogued stars | ||
| Other | ||
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