Durante os anos de 1750-1754 se dedicou a estudar as estrelas e constelações do hemisfério austral, com este intuito viajou até o Cabo da Boa Esperança na parte mais austral do continente africano. Com base nestas observações publicou o Coelum Australe Stelliferum sua obra mais importante.
Voyage to the Cape of Good Hope
His desire to determine the distances of the planets trigonometrically, using the longest possible baseline, led him to propose, in 1750, an expedition to the Cape of Good Hope. This was officially sanctioned by Roland-Michel Barrin de La Galissonière. There he constructed an observatory on the shore of Table Bay with the support of the Dutch Governor Ryk Tulbagh. The primary result of his two-year stay was a catalogue of nearly 10,000 southern stars, the production of which required observing every night for over a year. In the course of his survey he took note of 42 nebulous objects. He also achieved his aim of determining the lunar and solar parallaxes (Mars serving as an intermediary). This work required near-simultaneous observations from Europe which were carried out by Jérôme Lalande.
- que também faz parte da constelação de Dorado, o Peixe Dourado
(que acolhe a tão conhecida Nebulosa Tarântula, ainda dentro da Grande Nuvem de Magalhães).
É uma constelação de estrelas que vão além de magnitude 5, portanto pouco visíveis.
No entanto, a estrela Beta Mensae situa-se bem ao centro da Nebulosa Tarântula.
Uma das grandes alegrias em morar na roça
Eu sempre me divirto (e até quase fico tonta)
(Talvez a tontura também fique por conta
Aqui na roça, um antigo caseiro meu
Não importa o que se pense sobre estas Nuvens
Com um abraço estrelado,
Thousands of images were assembled into seamless portraits of the main body of each galaxy to produce the highest-resolution surveys of the Magellanic Clouds at ultraviolet wavelengths. The project was proposed by Stefan Immler, an astronomer at Goddard.
The Large and Small Magellanic Clouds, or LMC and SMC for short, lie about 163,000 and 200,000 light-years away, respectively, and orbit each other as well as our own Milky Way galaxy.
Compared to the Milky Way, the LMC has about one-tenth its physical size and only 1 percent of its mass. The SMC is only half the size of the LMC and contains about two-thirds of its mass.
The new images reveal about a million ultraviolet sources within the LMC and about 250,000 in the SMC.
Viewing in the ultraviolet allows astronomers to suppress the light of normal stars like the sun, which are not very bright at these higher energies, and provide a clearer picture of the hottest stars and star-formation regions.
Only Swift's Ultraviolet/Optical Telescope, or UVOT, is capable of producing such high-resolution wide-field multi-color surveys in the ultraviolet. The LMC and SMC images range from 1,600 to 3,300 angstroms, UV wavelengths largely blocked by Earth's atmosphere.
The Large and Small Magellanic Clouds are readily visible from the Southern Hemisphere as faint, glowing patches in the night sky. The galaxies are named after Ferdinand Magellan, the Portuguese explorer who in 1519 led an expedition to sail around the world. He and his crew were among the first Europeans to sight the objects. All visible light imagery provided by Axel Mellinger, Central Michigan University.
This video is public domain and can be downloaded at:http://svs.gsfc.nasa.gov/goto?11293
Credit: Science - NASA, ESA, A. Fox, P. Richter et al.
Image - D. Nidever et al., NRAO/AUI/NSF, A. Mellinger, LAB Survey, Parkes, Westerbork, and Arecibo Obs.
|The Large Magellanic Cloud|
|Observation data (J2000 epoch)|
|Right ascension||05h 23m 34.5s|
|Declination||−69° 45′ 22″|
|Distance||162.98 kly (49.97 kpc)|
|Apparent dimensions (V)||10.75° × 9.17°|
|Apparent magnitude (V)||0.9|
|LMC, ESO 56- G 115, PGC 17223, Nubecula Major|
No entanto, mais tarde foram descobertos sinais de estrutura espiralada
e alguma relação com espirais barrados.
A barra é a parte mais interessante da galáxia
e se parece com uma nuvem estelar brilhante e alongada
e ao longo dessa barra, existem numerosas nebulosas
avermelhadas por hidrogênio ionizado,
e estimuladas pela radiação de estrelas quentes e jovens.
Nestas regiões são formadas novas estrelas.
|Large Magellanic Cloud|
|The largest of the satellite galaxies and also the fourth largest galaxy in the Local Group. This galaxy is a large bright object in southern hemisphere skies and it is the brightest galaxy in the sky. It contains several billion stars and many stars are still forming in it, most notably in the Tarantula nebula, a huge concentration of gas and dust over 2000 light years in diameter. A supernova exploded in the Large Magellanic Cloud in 1987 and observations of the expanding supernova remnant provided accurate distance measurements to the galaxy.|
|Small Magellanic Cloud|
|Despite its name, this galaxy is fairly large for a dwarf galaxy. It contains at least several hundred million stars and is easily visible with the naked eye from the southern hemisphere. Like the Large Magellanic Cloud, there is still a lot star formation taking place within it.|
CONHEÇA MUITÍSSIMO MAIS
SOBRE A GRANDE NUVEM DE MAGALHÃES
em Imagens maravilhosamente bem detalhadas
Image Credit & Copyright: