| Emission nebula | |
|---|---|
| H II region | |
NGC 604 inside the Triangulum Galaxy | |
| Observation data: J2000 epoch | |
| Right ascension | 01h34m 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 | massive H II region 3.5 million years old[2] |
| See also: Lists of nebulae | |
NGC 604 is an H II region inside the Triangulum Galaxy. It was discovered by William Herschel on September 11, 1784. It is among the largest H II regions in the Local Group of galaxies; at the galaxy's estimated distance of 2.7 million light-years, its longest diameter is roughly 1,520 light years (~460 parsecs), over 40 times the size of the visible portion of the Orion Nebula. It is over 6,300 times more luminous than the Orion Nebula, and if it were at the same distance it would outshine Venus. Its gas is ionized by a cluster of massive stars at its center[4] with 200 stars of spectral type O and WR, a mass of 105 solar masses, and an age of 3.5 million years;[2] however, unlike the Large Magellanic Cloud's Tarantula Nebula central cluster (R136), NGC 604's one is much less compact and more similar to a large stellar association.[5]
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|---|---|---|
| Location |
Triangulum Galaxy → Triangulum subgroup →
Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe |
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| H II regions |
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| Suspected satellite galaxies |
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