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Eta Carinae

Astronomy Eta CarEta Cassiopeiae

Eta Carinae is located in the constellation Carina (right ascension 10 h 45.1 m, declination −59°41m), and believed to lie about 7,500 light-years from Earth.

 


Eta Carinae
This "almost true-color" image shows material surrounding the star Eta Carinae obtained with the second-generation Wide Field and Planetary Camera installed in the Hubble Space Telescope in December 1993.

Eta Carinae is a sixth- magnitude star located between 8,000 and 10,000 light-years away in the constellation Carina (the keel) which lies in the southern hemisphere. It was first cataloged in 1677 by astronomer extraordinaire Edmund Halley.

ETA CAR (Eta Carinae). "Magnificent;" "Grandest in the Galaxy of stars"; "None like it:" so would go critical reviews were Eta Car a stage actor rather than a star. Hyperbole?

Eta Carinae, the Milky Way's most massive star, is blowing itself apart in a series of powerful explosions. The star, which lies 8,000 light-years away, is about 100 times as massive as the Sun.

Eta Carinae Nebula
The Carina Nebula is a large bright nebula that surrounds several open clusters of stars. Eta Carinae and HD 93129A, two of the most massive and luminous stars in our Milky Way galaxy, are among them....
Hourglass Nebula ...

Eta Carinae is perhaps the most famous of the really big stars. It first gained widespread attention about 160 years ago when it flared spectacularly from obscurity to become one of the brightest in the sky.

Eta Carinae is "a hard one to get your head around," says John Martin, assistant professor of astronomy/physics at the University of Illinois, Springfield.

Eta Carinae is associated with the Keyhole Nebula (see below)
Double stars in Carina:
Upsilon Carinae is easily resolved, a pleasant binary of two white stars (visual magnitudes 3.0, 6.0), 127º and separation of 5.0".
Variable stars: ...

Eta Carinae
A huge, billowing pair of gas and dust clouds are captured in this stunning image of the supermassive star Eta Carinae. It is estimated to be 100 times more massive than our Sun and may be one of the most massive stars in our Galaxy.

This is Eta Carinae and the Keyhole Nebula. (Courtesy of the Anglo-Australian Observatory/Royal Observatory Edinburgh)
(146K GIF)
This is another image of Eta Carina. It is the largest diffuse nebula
(16K JPG) ...

An old name for Eta Carinae.
Killing vector
When it exists, the Killing vector describes symmetry properties of spacetime.

Eta Car with the surrounding the Eta Carinae Nebula is one of the most peculiar objects in the sky.

Carina also contains Eta Carinae. A century ago, Eta Carinae abruptly brightened to an apparent magnitude of -0.8 and was, briefly, the second brightest star in the sky.

Stars like Eta Carinae and the ``Pistol star'' are examples of these supermassive stars. The picture of Eta Carinae below shows two dumbbell-shaped lobes of ejected material from the star in an earlier episode of mass ejection.

[43] The existence of other stars changing in brightness gave credence to the idea that some may change in colour too; Sir John Herschel noted this in 1839, possibly influenced by witnessing Eta Carinae two years earlier.

The constellation contains a unique star, Eta Carinae, that flared up to become brighter than Canopus in 1843, but has since faded to the limit of naked-eye visibility.

Ia-0 (hypergiants or extremely luminous supergiants (later addition), Example: Eta Carinae (spectrum-peculiar)
Ia (luminous supergiants), Example: Deneb (spectrum is A2Ia)
Iab (intermediate luminous supergiants) ...

A: Betelgeuse, an old, red supergiant in the constellation Orion, is one of the largest in diameter; it is 500 to 750 times the size of our Sun. One of the most massive stars is Eta Carinae (a variable star); it is about 200 times the mass of our Sun.

Over 300 bright nebulae have been cataloged; prime examples are the Orion Nebula, visible to the unaided eye, the Eta Carinae Nebula, and the smaller North America Nebula.

surpass those of any other known object of its type. Though similar in appearance to another bipolar planetary, the Butterfly Nebula (M2-9), the Ant has an outflow pattern that more closely resembles that of the bizarre, unstable star Eta Carinae.

See also: Carina, Eta Car, Light, Sun, Star