Science, Space and Technology News 2023
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A recent study on the BlueWalker 3 satellite’s impact on astronomy underscores concerns about brightness and radio interference, prompting calls for pre-launch assessments and protective measures as commercial satellite deployments increase. Credit: AST SpaceMobileas a prototype for a planned constellation of over a hundred similar satellites intended for use in mobile communications. Observations made shortly after launch showed that the satellite was among the brightest objects in the sky.
The BlueWalker 3 satellite captured on April 3, 2023. The optical brightness of the 8 meter x 8 meter satellite — one of the brightest objects in the night sky having reached a peak brightness of magnitude 0.4 — is exhibited here as it travels across the starry backdrop. For comparison, two fainter satellites can also be seen in the footage; Starlink-4781 and Starlink-4016 . Credit: Delft Technical University/M.
“Besides the effect on visible observations, BlueWalker 3 could also interfere with radio astronomy, since it transmits in radio frequencies close to those that radio telescopes observe in,” says Federico Di Vruno, co-director of the IAU CPS. “The novel aspect of BlueWalker 3 is that it uses frequencies that are normally used by terrestrial transmitters,” he adds.
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