martinsastro

Astronomy for all.
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Dargo to Licola


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etaha-2.jpg
etaha-2.jpgEta Carinae in HA.717 viewsThis stellar system is currently one of the most massive that can be studied in great detail. Until recently, Eta Carinae was thought to be the most massive single star, but it was recently demoted to a binary system.[7] The most massive star in the Eta Carinae multiple star system has more than 100 times the mass of the Sun. Other known massive stars are more luminous and more massive.

Stars in the mass class of Eta Carinae, with more than 100 times the mass of the Sun, produce more than a million times as much light as the Sun. They are quite rare — only a few dozen in a galaxy as big as the Milky Way. They are assumed to approach (or potentially exceed) the Eddington limit, i.e., the outward pressure of their radiation is almost strong enough to counteract gravity. Stars that are more than 120 solar masses exceed the theoretical Eddington limit, and their gravity is barely strong enough to hold in their radiation and gas.

Eta Carinae's chief significance for astrophysics is based on its giant eruption or supernova impostor event, which was observed around 1843. In a few years, Eta Carinae produced almost as much visible light as a supernova explosion, but it survived. Other supernova impostors have been seen in other galaxies, for example the false supernovae SN 1961v in NGC 1058[8] and SN 2006jc in UGC 4904,[9] which produced a false supernova, noted in October 2004. Significantly, SN 2006jc was destroyed in a supernova explosion two years later, observed on October 9, 2006.[10] The supernova impostor phenomenon may represent a surface instability[11] or a failed supernova. Eta Carinae's giant eruption was the prototype for this phenomenon, and after nearly 170 years the star's internal structure has not fully recovered.
Martin
Chicken-done2G.jpg
Chicken-done2G.jpgChicken nebula.652 viewsJust testing the guiding on the G11 with Gemini 2Martin
NGC4945_supernova.jpg
NGC4945_supernova.jpgNGC4945709 viewsNGC4945 with the supernova 2011ja (January 01-2012).Martin
catspaw.jpg
catspaw.jpgCats paw nebula.949 viewsNGC 6334 (also known as the Cat's Paw Nebula , Bear Claw Nebula and Gum 64) is an emission nebula located in the constellation Scorpius.[2] It was discovered by astronomer John Herschel in 1837, who observed it from the Cape of Good Hope in South Africa.Martin
Jens_scope.jpg
Jens_scope.jpg528 viewsMartin
Jen5.jpg
Jen5.jpg517 viewsMartin
Big_Dave.jpg
Big_Dave.jpg544 viewsMartin
chickenHA.jpg
chickenHA.jpgChicken nebula.657 viewsIC 2944, also known as the Running Chicken Nebula or the Lambda Cen Nebula, is an open cluster with an associated emission nebula found in the constellation Centaurus, near the star Lambda Centauri. It features Bok globules and is most likely a site of active star formation.

The Hubble Space Telescope image on the right is a close up of Bok Globules discovered in IC 2944 by South African astronomer A. David Thackeray in 1950[2]. These globules are now known as Thackeray's Globules.
Martin

Last additions
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IMG_0518.jpgnice view870 viewsnice viewMartinMay 21, 2016
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IMG_0517.jpgARB Kev935 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg443 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg452 viewsJacki and carMartinMay 21, 2016
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IMG_0514.jpg454 viewsAlex's carMartinMay 21, 2016
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IMG_0513.jpg460 viewsScotty's carMartinMay 21, 2016
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IMG_0512.jpg462 viewsMark beside his carMartinMay 21, 2016
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IMG_0511.jpg450 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016