NGC 604
| Emission nebula | |
|---|---|
 | |
| Observation data: J2000.0 epoch | |
| Right ascension | 01h 34m 33.2s[1] |
| Declination | +30° 47′ 06″[1] |
| Distance | 2.7 Mly (840 kpc)[2] (extra-galactic) ly (0.73 Mpc pc) |
| Apparent magnitude (V) | +14.0 [1] |
| Apparent dimensions (V) | 1′.93 x 1′.2 arcmins[1] |
| Constellation | Triangulum |
| Physical characteristics | |
| Radius | 760 ly [3] ly |
| Absolute magnitude (V) | -13.8 |
| Notable features | massive H II region |
NGC 604 is an H II region inside the Triangulum Galaxy. It was discovered by William Herschel on September 11, 1784. It is one of 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 1500 light-years (460 parsecs), over 40 times the size of the visible portion of the Orion Nebula. It is over 6300 times more luminous than the Orion Nebula, and if it were at the same distance it would outshine Venus. Like all emission nebulae, its gas is ionized by a cluster of massive stars at its center.[1]
External links
Wikimedia Commons has media related to NGC 604.
- Nebula NGC 604 @ SEDS Messier pages
- NASA APOD: NGC 604 - August 16, 1996
- NASA APOD: NGC 604 - November 2, 2002
References
- Some data in the table was updated from Sue French's column "Deep-sky Wonders", in the January 2006 issue of Sky & Telescope, p. 83.
- ^ a b c d "NASA/IPAC Extragalactic Database". Results for NGC 604. Retrieved 2006-09-03.
- ^ Barba, Rodolfo (2004). "An in-depth analysis of a prototypical giant H II region: NGC 604". HST Proposal ID #10419.
- ^ distance × sin( diameter_angle / 2 ) = 760 ly. radius
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