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Mensagens - ahlberto

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1
Notícias / Re: APOD DO DIA
« em: Junho 10, 2010, 09:19:29 am »
Regulus and the Red Planet
Image Credit & Copyright: Babak Tafreshi (TWAN)
Explanation: Leo's royal star Regulus and red planet Mars appear in a colorful pairing just above the horizon in this starry skyscape. The photo was taken on June 4th from Oraman, a mountainous region of Kurdistan in western Iran near the border with Iraq. The marked color contrast between Mars and the bright blue star was easy to discern by eye, but is further enhanced in the picture through the use of a diffusion filter. Otherwise dominating the western evening sky, brilliant Venus has already set below the mountains in the scene. Saturn still shines in the night though, farther eastward along the ecliptic plane. Sliding your cursor over the picture will identify the planets, the stars of Leo, and a long-recognized star cluster in Coma Berenices.

2
Construir e montar telescópios (ATM) / Re: Mods ao meu 8" Dobson
« em: Junho 10, 2010, 01:32:42 am »
Já agora não podia deixar de por aqui a minha caixinha para oculares feita por mim,e ,também uma caixa para o meu C8 feita a partir duma mala para uma camara de filmar profissional da sony cedida pelo meu amigo eduardo

3
Construir e montar telescópios (ATM) / Re: Mods ao meu 8" Dobson
« em: Junho 10, 2010, 01:19:28 am »
Mais uma fotos entre elas as roldanas usadas para as rodas de altitude.

4
Construir e montar telescópios (ATM) / Mods ao meu 8" Dobson
« em: Junho 10, 2010, 01:09:54 am »
Olá.Os mods que fiz a este dob foram extensos até porque foi um dob construido de raiz.O tubo foi gentilmente cedido pelo meu amigo joão pedro(um amigo como poucos...),a base foi dada peo meu amigo raimundo da astrofoto e os aneis foram dados pelo francisco.A base foi serrada nas duas tabuas de altitude em cerca de 15 cm para ficar mais estál e estecticamente melhor,sem duvida.O interior do tubo foi flockado com veludo prto da D-C-FIX e fiz uns ahlbertos knobs para mais fácil colimação do secundario.Na parate de trás,na chapa que protege o espelho primario,foi adiciobada uma entoinha com o respectivo plug e ainda fiz 6 furos correspondentes aos parafusos de colimação para não ter que se remover a chapa cada vez que se pretente colimar.Substitui os parafusos originais de colinação do primario,todos os seis,por parafusos sextavados para mais fácil colimação.Também fiz uma barra de contrapesos que é util quando se usam oculares mais pesadas.As rodas de altitude foram feitas(pasme-se e eram da exacta medida!!!)com as roldanas para estores que se vendem em qualquer drogaria e custaram 1.40 cent cada uma....Pus também uma pequena caixa na base para gurdar pequenas ferramentas.O proximo e ultimo mod quando tiver€€€ é substituir o focador por um dual rate da skywatcher que são excelentes.No focador actual,substitui os parafusos de aperto de metal por uns de plastico para não ferir o barril das oculares.

5
Discussão Geral / Re: Que Equipamentos Tens? (AQUI)
« em: Junho 10, 2010, 12:20:20 am »
Bem,vou fazer aqui um update aos equipamentos que tenho actualmente.Continuo com o C8 mas com ourta montagem,-a nexstar e um dobson feito por mim com um 8" da skywatcher

6
Notícias / Re: APOD DO DIA
« em: Junho 10, 2010, 12:07:43 am »
Orange Sun Simmering
Credit & Copyright: Alan Friedman (Averted Imagination)
Explanation: Even a quiet Sun can be a busy place. And over the deep Solar Minimum of the past few years, our Sun has been unusually quiet. The above image, taken last week in a single color of light called Hydrogen Alpha and then false colored, records a great amount of detail of the simmering surface of our parent star. The gradual brightening towards the Sun's edge in this color-inverted image, called limb darkening, is caused by increased absorption of relatively cool solar gas. Just over the Sun's edges, several prominences are visible, while two prominences on the Sun's face are seen as light streaks just above and right of the image center. Two particularly active areas of the Sun are marked by dark plages. In contrast to recent quiet times, our Sun is moving toward Solar Maximum, and for years will likely appear much more active.

7
Notícias / Re: APOD DO DIA
« em: Outubro 29, 2009, 07:58:24 pm »
Zodiacal Light Over Laguna Verde
Credit & Copyright: Manel Soria
Explanation: An unusual triangle of light is visible this time of year just before dawn, in the northern hemisphere. Once considered a false dawn, this triangle of light is actually Zodiacal Light, light reflected from interplanetary dust particles. The bright reflecting triangle is clearly visible on the right of the above image taken from Laguna Verde near Valparaíso, Chile in late July. The band of our Milky Way Galaxy on the left mirrors the zodiacal band. Zodiacal dust orbits the Sun predominantly in the same plane as the planets: the ecliptic. Zodiacal light is so bright in the north this time of year because the dust band is oriented nearly vertical at sunrise, so that the thick air near the horizon does not block out relatively bright reflecting dust. Zodiacal light is also bright for people in Earth's northern hemisphere in March and April just after sunset. In the southern hemisphere, zodiacal light is most notable after sunset in late summer, and brightest before sunrise in late spring.

8
Notícias / Re: APOD DO DIA
« em: Setembro 01, 2009, 08:26:24 am »
Shadows of Saturn at Equinox
Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA
Explanation: Unusual shadows and dark rings appeared around Saturn near its equinox last month. At that time -- early August -- Saturn's ring plane pointed directly at the Sun. Visible above, Saturn's moon Tethys casts a shadow visible only on the far right. Saturn's own shadow blacks out a large swath of rings on the right. The night side of Saturn glows with ringshine -- sunlight reflected by ring particles back onto Saturn. Images near equinox at Saturn are giving astronomers a chance to search for unexpected shadows that may illuminate previously unknown features of Saturn's complex ring system. Cassini, the robotic spacecraft orbiting Saturn that took this image, is not expected to survive to the next Saturnian equinox in 15 years.

9
Notícias / Re: APOD DO DIA
« em: Agosto 31, 2009, 08:37:14 am »
Open Cluster M25
Credit & Copyright: Jean-Charles Cuillandre (CFHT) & Giovanni Anselmi (Coelum Astronomia), Hawaiian Starlight
Explanation: Many stars like our Sun were formed in open clusters. The above pictured open cluster, M25, contains thousands of stars and is about two thousand light years distant. The stars in this cluster all formed together about 90 million years ago. The bright young stars in M25 appear blue. Open clusters, also called galactic clusters, contain fewer and younger stars than globular clusters. Also unlike globular clusters, open clusters are generally confined to the plane of our Galaxy. M25 is visible with binoculars towards the constellation of the Archer ( Sagittarius).

10
Notícias / Re: APOD DO DIA
« em: Agosto 30, 2009, 09:02:06 am »
D. rad Bacteria: Candidate Astronauts
Credit: Michael Daly (Uniformed Services University of the Health Sciences), DOE
Explanation: These bacteria could survive on another planet. In an Earth lab, Deinococcus radiodurans (D. rad) survive extreme levels of radiation, extreme temperatures, dehydration, and exposure to genotoxic chemicals. Amazingly, they even have the ability to repair their own DNA, usually with 48 hours. Known as an extremophile, bacteria such as D. rad are of interest to NASA partly because they might be adaptable to help human astronauts survive on other worlds. A recent map of D. rad's DNA might allow biologists to augment their survival skills with the ability to produce medicine, clean water, and oxygen. Already they have been genetically engineered to help clean up spills of toxic mercury. Likely one of the oldest surviving life forms, D. rad was discovered by accident in the 1950s when scientists investigating food preservation techniques could not easily kill it. Pictured above, Deinococcus radiodurans grow quietly in a dish.

11
Discussão Geral / Re: Que Equipamentos Tens? (AQUI)
« em: Agosto 29, 2009, 11:49:50 pm »
Actualizado.O meu C8 com uma denkmeier powerswitch S2

12
Notícias / Re: APOD DO DIA
« em: Agosto 29, 2009, 09:07:18 pm »
NGC 7771 Galaxy Group
Credit & Copyright: Kent Biggs
Explanation: Slide your cursor over the image to identify three members of this intriguing gathering of galaxies. Known as the NGC 7771 Group, they lie almost 200 million light-years away toward the high flying constellation Pegasus. The largest galaxy, barred spiral NGC 7771, is itself about 75,000 light-years across, but will someday find itself part of a larger galaxy still. As the galaxies of the group make repeated close passages, they will finally merge into one very large galaxy. Played out over hundreds of millions of years, the process is understood to be a normal part of the evolution of galaxies, including our own Milky Way.

Editor's Note: The labeled version of the image was generated by Astrometry.net.

13
Discussão Geral / Re: SW 8" MOD
« em: Julho 10, 2009, 08:30:10 pm »
célula do espelho acabada...brilhante!!!!!   http://www.youtube.com/watch?v=3RilfmWiq8Q

14
Notícias / NOVO FORUM DE ASTRONOMIA
« em: Junho 26, 2009, 11:14:51 pm »
Ola.Há um novo fórum de astronomia no ar    http://www.apaa.co.pt/forum/index.php

15
Discussão Geral / Re: Que Equipamentos Tens? (AQUI)
« em: Junho 26, 2009, 04:19:28 pm »
Muito fixe que está o st80,rui.É um belissimo telescópio.com esse focador deve ficar maravilhoso.
astroabraços

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