Astronomers at STScI in Baltimore have developed new software tools to reduce the adverse impact of satellites on images captured by Hubble.
The light echo around the star V838 Monocerotis as seen by the Hubble Space Telescope in November 2005. | Credit: NASA, ESAwas launched in 1990, there were about 470 artificial satellites orbiting Earth. By 2000, that number doubled. But by 2023, the rising number has grown almost exponentially to nearly 8,000 satellites. For Hubble this means that satellites photobomb about 10% of its exposures on celestial targets. But a typical satellite trail is very thin and will affect less than 0.
“We developed a new tool to identify satellite trails that is an improvement over the previous satellite software because it is much more sensitive. So we think it will be better for identifying and removing satellite trails in Hubble images,” says Dave Stark of STScI..” The tool identifies satellite trails across Hubble’s ACS. However, satellites aren’t the only artifact that astronomers deal with.“Cosmic rays rain onto Hubble’s camera detectors. These leave what looks like ‘scratch marks’ too.
The Radon Transform software tool that Stark and other astronomers use is vital in different scientific fields, including medical applications such as reconstructing CT scans and environmental science like reconstructing maps of Earth’s polar regions.
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