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astroavani

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astroavani last won the day on January 14

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About astroavani

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    Sub Dwarf

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    Male
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    Astrofotografia
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    Canoas, Brazil
  1. Recently, NASA found evidence of fresh ice on Encélado, one of the moons on the planet Saturn, capable of harboring life. The ice rinks were captured by infrared images recorded by the Cassini spacecraft, and were announced in a NASA statement. Enceladus is one of the bets of scientists to shelter life. It is speculated that, some years ago, it was studied that there is an underground ocean beneath its thick icy crust, and that perhaps there are natural substances for the emergence of life. , the Enceladus looks quite uniform, with a shiny white icing, like a snowball sailing through space. In records captured by Cassini, astronomers found that some of that ice on the Moon is fresh. Therefore, the event raised questions among scientists, and it is now speculated that internal activities are re-emerging in Enceladus. Although appearing uniform, the Moon of Saturn is not a peaceful place to live. In 2005, the Cassini probe captured plumes of salt water emerging from four giant parallel chasms at the south pole of the moon, named 'Tiger Stripes'. Since then, the probe has seen more than 100 geysers in the region. The parallel chasms are derived from the natural phenomenon that occurs in Saturn's orbit. The planet pulls and stretches its moon, causing internal warming and geothermal activity, forming cracks in the icy surface of the south pole. The geysers expel water from inside, reaching the surface and forming layers of frozen liquid. These events were only discovered because of the new technology installed on the Cassini probe, called Visual and Infrared Mapping Spectrometer (VIMS). The tool collected the reflected light from Saturn, its ten main moons and its rings, and divided them into divergent wavelengths. The Cassini spacecraft was sent to space in 1977, entering Saturn's orbit in 2004. Its mission was completed in 2017, when the spacecraft was launched against the planet's atmosphere. Even so, the probe managed to register new phenomena about Enceladus and inform NASA's headquarters. Source: G Notícias - Daniela S. - 20/09/2020
  2. Some explanations about the photo captions: First of all, I put the date and time as stated in WinJUpos Then I place the CM, which are the meridians used to locate the positions on Jupiter, the most important is the CMIII which is the Magnetic meridian, as it never changes. So any scholar can accurately locate something on Jupiter and compare it to another photographer's photo anywhere in the world. Because Jupiter has a very dynamic atmosphere and new things are always coming up like Outbreak in the temperate zone above the GRS. Above the setup I made an estimate of the seeing and put the altitude that the star was at the time of the photo. Then I put the setup that was used to make the photo, this is also important to give an idea of the level reached, because you can't want a C8 to take a photo with the details of a C14, can you? Finally, I put the place where the photo was taken, in this case, República Rio Grandense because we declared independence.
  3. Again the King of the Rings This has been a difficult season in the south of Brazil for photos of Jupiter and Saturn, the weather almost never collaborates, we are having a lot of rain and cloudiness and, when the turbulence clears, it has detonated everything. Even so, using improved techniques you can get some interesting photos amidst a lot of mediocre photos. Those two were fortunately one of them.
  4. Não, apenas mudei um pouco, é autor desconhecido!
  5. TALKING TO THE MOON On a starry night She appears quietly Its brightness gets stronger Clearing my path The sky is more beautiful With the reflection of your gaze And in the silence of the night She makes me walk As far as she is Will never fail to shine Your light doesn't go out And let life take me Whether new or full moon I will always be your admirer Your beauty fascinates me In awe of the creator
  6. Domes of Arago This is the best week for lunar observation, the shadows are long and the formations stand out easily. In this particular photo we can see the domes near Arago. There are a pair of very large domes, one to the north (Arago Alpha) and one to the west (Arago Beta). These are two of the largest and most prominent domes of the Moon and, halfway between Arago a and the Maclear crater (160 kilometers to the northeast), you will find a challenging group of four smaller domes. It will be a good victory for you, if you can identify them. The domes or domes, are low and rounded structures, found in areas of mares where formerly the growing magma pushed upwards and caused the lunar surface to jump in bubble-like bumps. Sometimes, the underlying pressure was not enough to cause the magma to break; others, the domes erupted in small, slightly inclined shield volcanoes, and their holes in the summit can actually be seen under low angle lighting as seen here: https://www.astrobin.com/200363/?nc=user The lunar domes do not attract attention, like the most spectacular craters and mountains, so they are easily ignored, but they are fascinating objects and are worth the effort to look for. As the endogenous theory of crater formation has been widely contested, it is fun to hunt for evidence that there was indeed volcanic activity on the Moon. You will need at least 15 cm of aperture and 150 to 300X power to view most of the domes. As the lunar progresses, pay attention to the region near the terminator, it is a good challenge to try to identify these formations in addition to being a testament to the good optical quality of your equipment. Source: Andrew Planck Adaptation: Avani Soares
  7. The Seeliger effect Generally, when you look at Saturn through a telescope before or after opposition, the rings look as bright as the planet's globe. For days at the time of the opposition, however, the rings suddenly intensify in apparent brightness, blinding the globe before returning to its normal appearance. German astronomer Hugo von Seeliger (1849-1924) noticed this change for the first time in 1887. Because of his pioneering research on its cause, which led him to conclude that Saturn's rings were composed of small particles, the effect was named in honor of that scientist. Two main physical processes lead to the Seeliger effect: shadow hiding and coherent backscattering. When we see Saturn directly illuminated by the Sun (as it is during opposition), the planet's shadow “hides” behind the globe, putting more surface of the ring in view. As a result, the rings appear to lighten. The same angle of direct illumination also causes the shadows of individual particles in the rings to temporarily disappear, improving the result. The Seeliger effect, which combined the enhancements of shadow hiding and coherent backscatter, makes Saturn's rings appear brighter the closer the planet is to the opposite side of the sun. The Seeliger effect, which combines the enhancements of shadow hiding and coherent backscatter, makes Saturn's rings appear brighter the closer the planet is to the side opposite the Sun, as in the top image compared to the bottom. Christopher Go But that is not all. Observations of the effect of the opposition on the Cassini spacecraft's Saturn rings, in orbit around the planet, reveal that "coherent backscattering" also contributes significantly to the phenomenon. This occurs when sunlight interacts with the collective particles in the planet's rings; the reflections of many irregular pieces of rock and dust combine to produce a single, more coherent (coherent) light. This light spreads back to our eyes and makes the rings appear lighter. In contrast, and in the days immediately following, we see the combination of these two mechanisms as a temporary increase in the overall illumination of the rings. The only way to fully appreciate the effect visually, however, is to monitor the planet and its rings during the days around that magical moment - weather permitting. Source: Astronomy; Stephen James O'Meara
  8. A Cave in Marius HillsMost researchers agree that the Moon is about 4.5 billion years old, possibly about 50 million years younger than the rest of the solar system. One of the theories says that the moon was formed when another planet (about the size of Mars) struck the molten stone ball that was Earth at that time. Some of the remains of that collision were turned into space where they eventually reformulated as a solid mass - our current moon.Although this part of the Moon's history is generally accepted, other areas are still very uncertain. One is the question of when there was volcanic activity on the Moon, how long this activity lasted and how much there was. Early studies of lunar volcanic rocks were possible when samples were brought to Earth by astronauts during the Apollo missions from 1969 to 1972.Studies suggest that volcanic activity on the moon began soon after the formation of the moon, or about 0.5 billion years earlier than previously thought. Most of the volcanism on the Moon probably happened around 3.8 to 3.9 billion years ago, and mostly stopped about 3 billion years ago.In December 2009, the Kaguya spacecraft sent images of a large hole in a winding wave in the Marius Hills region, a volcanic area on the lunar side. Sinuous rails are formed in two different ways: as open lava canals and / or as lava tubes, many of which subsequently collapse. Because the Marius Hills well is in the middle of a winding rille, it probably represents a collapse in the roof of a lava tube. The well itself may have been caused by a meteorite impact that pierced through the roof of the lava tube.The Marius Hills well was discovered in images from the Japanese camera SELENE / Kaguya Terrain and Multiband Imager, and reported in Geophysical Research Letters. The Japanese team, led by Junichi Haruyama, performed multiple observations of the well using both the Terrain Camera and the Multiband Imager at resolutions up to 6 meters / pixel (see central photos). The LROC image (shown here at the top left) at 0.5 meters / pixel is the highest resolution image of the Marius Hills batch to date! The SELENE / Kaguya Terrain Camera team also made a film about the hole (https://www.lpi.usra.edu/lunar/lunar_flyovers/marius_hills/). The Marius Hills region was volcanically quite active in the past and contains numerous volcanic features including winding riles like those labeled Rilles A and B plus numerous hills that are actually domes and can be seen quite clearly in my photo.How and when did the well caves form? On Earth, volcanic pit craters are formed as the roof of a lava tube collapses, often while the magma is still flowing underground. The resulting aperture is often referred to as a skylight. Can we determine if the moon skylights formed during or after the lavas on the floor flow? Perhaps the best place to start looking for evidence is on the pit floor. If the skylight was formed long after the eruptions had ceased and the underground lava tubes were cold, you might find a chaotic pile of rubble on the floor. If the well collapsed into an active lava tube, you can find the smooth, frozen surface of the last lava that flowed through the tube.This well or skylight is intriguing because it suggests that many other lunar Rilles may also have wells or skylights formed through the collapse of the lava tube.Robert Zimmerman in this article; http://behindtheblack.com/behind-the-black/essays-and-commentaries/single-rope-techinque-on-the-moon/, makes some interesting assumptions about the depth of the well and the difficulty in exploring it in future missions.Lava tubes may be useful as sites for lunar bases (see a report by Fred Hörz of JSC here:http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1985lbsa.conf..405H&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf. The interior of lava tubes could protect human explorers from different aspects of the lunar environment, including cosmic rays, meteorite impacts, and extreme temperature differences between lunar day and night. Like caves on Earth, lunar caves, including lava tubes, have temperatures that are constant. Our human ancestors, who in a distant age inhabited caves to protect themselves at the dawn of civilization, will have known, their descendants doing the same in that silver star that illuminated the shadows and turned away the darkness and their deepest fears!Sources: KaKuya / Jaxa-Selene - LROC / NASA - Behind the Black / Robert Zimmerman - Lunar and Planetary Institute - Lava Tube / Friedrich HörzAdaptation and text: Avani Soares
  9. So create courage and get to work!
  10. I'm not entirely sure, but something around 1000X magnification. A correct calculation could be made, but I am making a rough estimate.
  11. LOL, amazed because you liked it?
  12. I had the opportunity to borrow a monochrome camera to do the tests I always wanted on the Moon.Below are the first results for colleagues to analyze.I realized from the outset the advantage of mono cameras for specific wavelengths since I normally use an ASI290MC to do all my captures. This is mainly explained by the fact that, without the layer matrix, a monochrome camera uses 100% of its pixels to perform the capture, while a color camera would use only 25% to capture on the IR 685 which was the filter used.Despite everything, due to the great fluctuation of my seeing, varying in a matter of a few minutes, I do not discard the advantages of a color camera for color captures, since while a mono camera would make only 1 film I can make at least about 4 with the colored one. This greatly increases the chance of catching a brief favorable moment that can save an entire section of photography.Moon on May 4, 2020.C14 Edge + ASI 178MM + IR pass 685Total of 2000 frames per photo with 350 stacking.
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