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Lagoon Nebula

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Lagoon Nebula
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factoids
300px| caption= M8, the Lagoon Nebula| type= H II region| epoch = J2000
1837}}SIMBAD
, M 8
, 2006-11-15,
−2412}}| dist_ly= 4,100JOURNAL
, Arias, J. I.
, Barbá, R. H.
, Maíz Apellániz, J.
, Morrell, N. I.
, Rubio, M.
, 2006
, The infrared Hourglass cluster in M8
, Monthly Notices of the Royal Astronomical Society
, 366, 3, 739–757
, 2006MNRAS.366..739A
, 10.1111/j.1365-2966.2005.09829.x
, astro-ph/0506552, | dist_pc =1,250| appmag_v = 6.0
Minute of arc>arcminsSagittarius (constellation)>Sagittarius| radius_ly = 55 × 20| absmag_v =| notes =Sharpless catalog>Sharpless 25, RCW Catalogue 146, Gum 72Messier object>M8 contains:    NGC 6523, NGC 6530,    Hourglass nebulaWEB
, SIMBAD Astronomical Database
, Results for Hourglass Nebula
,weblink
, 2006-12-22
, }}The Lagoon Nebula (catalogued as Messier 8 or M8, NGC 6523, Sharpless 25, RCW 146, and Gum 72) is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region.The Lagoon Nebula was discovered by Giovanni Hodierna before 1654WEB,weblink Messier Object 8, Guy McArthur, Hartmut Frommert, Christine, Kronberg, messier.seds.org, 11 April 2018, and is one of only two star-forming nebulae faintly visible to the eye from mid-northern latitudes. Seen with binoculars, it appears as a distinct oval cloudlike patch with a definite core. Within the nebula is the open cluster NGC 6530.BOOK, Handbook of Star-Forming Regions: Volume 2 The Southern Sky, Bo Reipurth, The Lagoon Nebula and its Vicinity, 53, N. F. H. Tothill, Marc Gagné, B. Stecklum, M. A. Kenworthy, Astronomical Society of the Pacific, 2008, 978-1-58381-671-4,

Characteristics

The Lagoon Nebula is estimated to be between 4,000-6,000 light-years from the Earth. In the sky of Earth, it spans 90' by 40', which translates to an actual dimension of 110 by 50 light years. Like many nebulas, it appears pink in time-exposure color photos but is gray to the eye peering through binoculars or a telescope, human vision having poor color sensitivity at low light levels. The nebula contains a number of Bok globules (dark, collapsing clouds of protostellar material), the most prominent of which have been catalogued by E. E. Barnard as B88, B89 and B296. It also includes a funnel-like or tornado-like structure caused by a hot O-type star that emanates ultraviolet light, heating and ionizing gases on the surface of the nebula. The Lagoon Nebula also contains at its centre a structure known as the Hourglass Nebula (so named by John Herschel), which should not be confused with the better known Hourglass Nebula in the constellation of Musca. In 2006 the first four Herbig–Haro objects were detected within the Hourglass, also including HH 870. This provides the first direct evidence of active star formation by accretion within it.

Gallery

Image:Hubble's 28th birthday picture The Lagoon Nebula.jpg|Hubble's 28th birthday picture of the Lagoon Nebula.WEB, Hubble celebrates 28th anniversary with a trip through the Lagoon Nebula,weblink www.spacetelescope.org, 20 April 2018, Image:New Hubble view of the Lagoon Nebula.jpg|The region is filled with winds from stars, funnels of gas, and star formation, all embedded within a haze of gas and dust.WEB, Stormy seas in Sagittarius,weblink 31 July 2015, File:Infrared view of Lagoon Nebula.webp|Infrared image revealing stars hidden behind dust and gas.Image:Messier 8.jpg|Image taken by the Wide Field Channel of the Advanced Camera for Surveys on Hubble.Image:VISTA's infrared view of the Lagoon Nebula (Messier 8).jpg|Infrared Lagoon Nebula.Image:Lagoon nebula SALT.jpg|Central region of the Lagoon Nebula, showing the Hourglass Nebula to the right.Image:Lagoon Nebula (ESO).jpg|The Lagoon Nebula Credit: ESO/S.Guisard.Image:GigaGalaxy Zoom composite.jpg|Three images from the ESO GigaGalaxy Zoom project.The images show the sky at different levels: from the view seen by the unaided eye to one seen through an amateur telescope, with a final zoom in onto the Lagoon Nebula as seen through a professional telescope.Image:Messier 8 Centre.jpg|Waves breaking in the stellar lagoon Credit: NASA, ESA.File:Diving into the Lagoon Nebula.OGG|Dive into the Lagoon Nebula.File:Hourglass Nebula region of Messier 8 (M8) in the 32 inch Schulman telescope on Mt. Lemmon, AZ.jpg|Hourglass Nebula region of Messier 8 (M8) in the 32 inch Schulman telescope on Mt. Lemmon, AZFile:M8_Lagoon_Nebula__from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg| Messier 8 (M8) in the 32 inch Schulman telescope on Mt. Lemmon, AZ

In fiction

{{See|Nebulae in fiction#Lagoon Nebula}}

See also

References

{{reflist}}

External links

{{commons category|Lagoon Nebula}} {{Messier objects}}{{Sh2 objects}}{{RCW}}{{Gum catalogue}}{{Sky|18|03|37|-|24|23|12|4100}}


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