martinsastro

Astronomy for all.
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Lester.jpg

1 files, last one added on Dec 26, 2011
Album viewed 192 times

Dargo to Licola


IMG_0518.jpg

18 files, last one added on May 21, 2016
Album viewed 22 times

Camper trailer files.



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Eta_2Mb.jpg
Eta_2Mb.jpgEta Carinae.193 viewsFocused on the dimmest star without a Bahtinov mask worked better than with a mask.Martin
NGC4945.jpg
NGC4945.jpgNGC4945.586 viewsNGC4945 with the Supernova.Martin
Malcolm.jpg
Malcolm.jpg141 viewsMartin
Eta_Carina.jpg
Eta_Carina.jpgEta Carinae197 viewstest image with OAG.Martin
Guess_who.jpg
Guess_who.jpg142 viewsGuess who?Martin
etacrop.jpg
etacrop.jpgEta Carinae nebula.172 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
goodbugcrop.jpg
goodbugcrop.jpgBug nebula.141 viewsNGC 6302 (also called the Bug Nebula or Butterfly Nebula), is a bipolar planetary nebula in the constellation Scorpius. It is one of the most complex[clarification needed] planetary nebulae observed. The spectrum of NGC 6302 shows its central star is one of the hottest objects in the galaxy, with a surface temperature in excess of 200,000 K, implying that the star from which it formed must have been very large.

The central star has never been observed and is surrounded by a particularly dense equatorial disc composed of gas and dust. This dense disc is postulated to have caused the star's outflows to form a bipolar structure (Gurzadyan 1997), similar to an hour-glass. This bipolar structure shows many interesting features seen in planetary nebulae such as ionization walls, knots and sharp edges to the lobes.
Martin
IMG_0511.jpg
IMG_0511.jpg23 viewsHang this in the ceiling and Mark will be out of business :PMartin

Last additions
IMG_0518.jpg
IMG_0518.jpgnice view23 viewsnice viewMartinMay 21, 2016
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IMG_0517.jpgARB Kev28 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg20 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg20 viewsJacki and carMartinMay 21, 2016
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IMG_0514.jpg23 viewsAlex's carMartinMay 21, 2016
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IMG_0513.jpg23 viewsScotty's carMartinMay 21, 2016
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IMG_0512.jpg23 viewsMark beside his carMartinMay 21, 2016
IMG_0511.jpg
IMG_0511.jpg23 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016