|H II region|
|Observation data: J2000 epoch|
|Right ascension||17h 24m|
|Distance||~ 8000 ly|
|Designations||War and Peace Nebula, Sharpless 11, RCW 131, Gum 66|
NGC 6357 is a diffuse nebula near NGC 6334 in the constellation Scorpius. The nebula contains many proto-stars shielded by dark disks of gas, and young stars wrapped in expanding "cocoons" or expanding gases surrounding these small stars.
This nebula was given the name War and Peace Nebula by the Midcourse Space Experiment scientists because of its appearance. They said that in infrared images the bright, western part resembles a dove, while the eastern part looks like a skull.
NGC 6357 and Pismis 24
Pismis 24This nebula includes the open cluster Pismis 24, which is home to several massive stars. One of the brightest stars in the cluster, Pismis 24-1, was thought possibly to be the most massive on record, approaching 300 solar masses, until it was discovered to be a multiple system of at least three stars; component stars would still remain near 100 solar masses, making them among the more massive stars on record.
- "SIMBAD Astronomical Database". Results for NGC 6357. Retrieved 2007-05-03.
- Robert Nemiroff, Jerry Bonnell (21 November 2010). "A Massive Star in NGC 6357".
- R. W. Sinnott, editor (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press.
- "2MASS Picture of the Week Archive Captions".
- "ESA Science & Technology: Star on a Hubble diet NGC 6357". Retrieved 2007-04-11.
- NASA: Massive Stars in Open Cluster Pismis 24, 2006
- Fang, M.; Van Boekel, R.; King, R. R.; Henning, T.; Bouwman, J.; Doi, Y.; Okamoto, Y. K.; Roccatagliata, V.; Sicilia-Aguilar, A. (2012). "Star formation and disk properties in Pismis 24". Astronomy & Astrophysics 539: A119.
- Martins, F.; Schaerer, D.; Hillier, D. J. (2005). "A new calibration of stellar parameters of Galactic O stars". Astronomy and Astrophysics 436 (3): 1049.
- European Southern Observatory infrared image
- blog about the nebulaSlate
- APOD Pictures:
- A Massive Star in NGC 6357 with a close-up of Pismis 24.
- Star Forming Region NGC 6357 showing complex interactions between interstellar winds, radiation pressures and magnetic fields.
- NGC 6357: Massive Stars
- A Massive Star in NGC 6357