Long streaks of gas can be seen dashing in opposite directions from the pedestal at the top of the image. Another pair of jets is visible at another peak near the centre of the image. These jets, known as HH and HH , respectively, are signposts for new star birth and are launched by swirling gas and dust discs around the young stars, which allow material to slowly accrete onto the stellar surfaces.
The colours in this composite image correspond to the glow of oxygen blue , hydrogen and nitrogen green , and sulphur red.
The name of the smaller nebula means Little Man in Latin. The Homunculus Nebula is believed to have been formed in the s, when a powerful outburst briefly made the massive central star the second brightest star in the sky. The event is known as Nova Carinae , or the Great Eruption. The outburst was also responsible for producing the two lobes the nebula is known for and a large, thin disk, all expanding at an approximate speed of 1 million kilometres per hour.
Although 19th century astronomers did not have telescopes powerful enough to see the outburst in detail, its effects can be studied today. The huge clouds of matter thrown out a century and a half ago, known as the Homunculus Nebula, have been a regular target for Hubble since its launch in The field of view is approximately 30 arcseconds across.
It is currently at the limit of unaided eye visibility, but would appear much brighter if it were not surrounded by clouds of dust.
The Keyhole Nebula is a dark nebula about seven light years in diameter. It was named for its keyhole shape, for which it is known. It lies silhouetted against the bright Carina Nebula in the background.
The Keyhole Nebula was named by the English mathematician and astronomer John Herschel in the 19th century. Astronomers John Herschel and James Dunlop, who also observed the southern skies, called the nebula the Eta Carinae Nebula or Eta Argus Nebula, referring to the former constellation Argo Navis, representing the ship of Jason and the Argonauts, which was split into several smaller constellations.
Carina constellation represents the keel of the ship, while Vela represents the sails and Puppis constellation marks the stern. This map shows most of the stars visible to the unaided eye under good conditions and the nebula itself is marked as a green square in a red circle at the left labelled for NGC This nebula is very bright and can be seen well in small telescopes, and faintly without a telescope at all. It is known to contain at least a dozen stars with a mass at least 50 to times than of the Sun.
Trumpler 14 is the youngest and most populated cluster in the group. The first generation of newly formed stars in the nebula are believed to have condensed some three million years ago, igniting in the middle of a large hydrogen cloud. Radiation from these young stars shaped a bubble of hot gas, which has kept expanding ever since. The stellar winds and ultraviolet radiation within the region are compressing cold hydrogen, resulting in more new stars being formed inside the nebula.
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Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs. Dimensions The physical size of the object or the apparent angle it subtends on the sky. About The Data Data Description Proposal: A description of the observations, their scientific justification, and the links to the data available in the science archive. Science Team: The astronomers who planned the observations and analyzed the data.
Instrument The science instrument used to produce the data. Exposure Dates The date s that the telescope made its observations and the total exposure time. Filters The camera filters that were used in the science observations. Publication Date The date and time the release content became public. Color Info A brief description of the methods used to convert telescope data into the color image being presented.
Orientation The rotation of the image on the sky with respect to the north pole of the celestial sphere. Back to top.
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