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The Hubble Space Telescope, from NASA, can be seen with the naked eye in much of Brazil on the night of this Wednesday (27), between 19:02 and 19:06. According to the Centauri astronomy club, the telescope will appear as a bright point of light crossing the sky without blinking, from southwest to northeast. Residents of the Southeast will have the best observation conditions, with an elevation above 80 degrees. According to information released by the CNN Brasil portal, the Hubble orbits about 537 kilometers from Earth and moves at 7.5 kilometers per second, without the need for binoculars or equipment.
The Hubble Space Telescope will cross the Brazilian sky this Wednesday night, and anyone with a clear sky and four minutes of patience can see it with the naked eye. The most famous equipment of modern astronomy will pass over Brazil between 19:02 and 19:06, appearing as a bright and continuous point of light moving from southwest to northeast without blinking. The brightness of the telescope can reach a magnitude between +2 and +4 during the crossing, intensity comparable to the brightest stars visible in the sky, completely dispensing with the use of binoculars or optical equipment.
The telescope orbits at about 537 kilometers altitude and moves at approximately 7.5 kilometers per second, a speed that explains why the observation window lasts only four minutes. The Centauri astronomy club reported that residents of the Southeast will have one of the best observation conditions in the country, with an elevation above 80 degrees, almost at the zenith. Itapetininga, in the interior of São Paulo, was pointed out as one of the ideal points, but the entire Southeast, the Southern region, Goiás, southern Bahia, and Mato Grosso do Sul will also have passages with good angular elevation.
How to identify the Hubble telescope in the sky
The telescope appears as a bright point of light moving in a straight line across the sky, without blinking. This is the fundamental difference compared to stars, which twinkle, and airplanes, which have flashing lights. The Hubble reflects sunlight, which still illuminates the equipment even after sunset on the surface, because the telescope is 537 kilometers above the Earth’s shadow.
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The trajectory will be from southwest to northeast, and the highest point in the sky will be reached approximately in the middle of the passage, between 7:03 PM and 7:04 PM. Experts from the Centauri club recommend looking for places with little artificial lighting and a clear horizon to facilitate viewing.
In large cities like São Paulo and Rio de Janeiro, light pollution may reduce visibility, but in open areas and peripheral neighborhoods, the telescope will be perfectly identifiable.
Why the Hubble Telescope is visible to the naked eye
The Hubble is 13.2 meters long and 4.2 meters in diameter, with solar panels that extend like wings on each side. This relatively large surface, combined with the equipment’s reflective coating, allows the telescope to reflect enough sunlight to be seen from the ground without any optical instrument, as long as the lighting conditions are favorable.
Visibility occurs during twilight, when the observer on the ground is already in the shadow, but the telescope, at an altitude of 537 kilometers, still receives direct sunlight. This combination creates the necessary contrast for the point of light to stand out against the darkened sky. Outside this twilight interval, the Hubble enters Earth’s shadow and becomes invisible, which explains why the telescope’s observation window is so short.
What the Hubble Telescope Has Done in 36 Years of Operation
Launched by NASA on April 24, 1990, the Hubble Space Telescope turns 36 in 2026 and is considered one of the most important observatories in the history of astronomy. Over more than three decades, the equipment has helped scientists discover dark energy, analyze the atmospheric composition of exoplanets, and measure distances of nearby galaxies using red giant stars as luminosity references.
The telescope has produced images that have become icons of scientific culture, such as the Pillars of Creation in the Eagle Nebula and the first detailed photographs of distant galaxies. Even with the James Webb Space Telescope entering operation in 2022, the Hubble remains active and continues to produce relevant scientific data, operating in ultraviolet and visible wavelengths that complement the Webb’s infrared observations.
What to Do to Not Miss the Telescope’s Passage
The observation window is only four minutes, from 7:02 PM to 7:06 PM. It is ideal to be in position at least five minutes earlier, in a location with little artificial light and a clear view of the southwest horizon, from where the telescope will appear. Look at the sky and search for a point of light that moves steadily and without blinking.
Apps like Heavens-Above and ISS Detector also track the Hubble in real-time and can help determine the exact position of the telescope in the sky for your location. This Wednesday’s passage is one of the brightest of the year for Brazil, visible to the naked eye without any equipment, and the next opportunity with such favorable conditions in Brazil may take weeks or months to repeat.
Are you going to try to see the Hubble Telescope crossing the sky over Brazil this Wednesday? Have you ever seen a satellite or space station with the naked eye? Share in the comments.
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