NGC 2404

Source: Wikipedia, the free encyclopedia.
arcsecs[3]
ConstellationCamelopardalis
Physical characteristics
Radius470 (estimated)[4] ly
Absolute magnitude (V)-14.5
Notable featuresMassive H II region,
the largest one in NGC 2403.
See also: Lists of nebulae

NGC 2404 is a massive H II region inside NGC 2403, a spiral galaxy in Camelopardalis. It was discovered on February 2, 1886 by Gulliaume Bigourdan. NGC 2404 is approximately 940 ly in diameter, making it one of the largest H II regions so far known. It is the largest H II region in NGC 2403, and lies at the outskirts of the galaxy, making for a striking similarity with NGC 604 in M33, both in size and location in the host galaxy. This H II region contains 30-40 Wolf-Rayet stars,[5] and unlike the Tarantula Nebula, but similar to NGC 604, NGC 2404's open cluster is probably much less compact, so it probably looks like a large stellar association. This H II region is probably only a few million years old.

References

  1. ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 2403. Retrieved 2006-11-21.
  2. S2CID 195218404
    .
  3. ^ http://library.navoiy-uni.uz/files/O'Meara%20C.%20O.%20-%20The%20Caldwell%20Objects%20(1st%20edition)(2002)(484s).pdf [bare URL PDF]
  4. ^ distance × sin( diameter_angle / 2 ) = 470 ly. radius
  5. ISBN 9781852338510
    – via Google Books.
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