{"id":35892,"date":"2023-10-03T10:05:10","date_gmt":"2023-10-03T09:05:10","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=35892"},"modified":"2023-10-03T10:05:10","modified_gmt":"2023-10-03T09:05:10","slug":"report-warns-new-bluewalker-3-satellite-for-mobile-is-too-bright","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2023\/10\/report-warns-new-bluewalker-3-satellite-for-mobile-is-too-bright.html","title":{"rendered":"Report Warns New BlueWalker 3 Satellite for Mobile is Too Bright"},"content":{"rendered":"

A new report has revealed that the prototype BlueWalker 3 satellite<\/a> in Low Earth Orbit (LEO), which was launched by AST SpaceMobile<\/a> to provide 4G<\/a> and 5G<\/a> mobile (broadband) coverage to regular handsets on the ground, is so big that it outshines 99% of the stars visible from a dark location on Earth – that’s a problem.<\/p>\n

The issue itself shouldn’t come as a surprise, as concerns have been raised before, due to the satellite<\/a>’s design. The 1.5-ton BlueWalker 3<\/strong> \u2013 orbiting at an altitude of a little over 500km \u2013 features a huge 693-square-foot (64.4-square-meter) phased array antenna (here<\/a>). This makes the unfolded platform much bigger than other communication satellites, which creates a large and highly reflective surface.<\/p>\n

NOTE:<\/strong> The International Astronomical Union (IAU) recommends that LEO satellites should have a maximum brightness of magnitude +7. On this scale, the brightest objects have the smallest numbers (e.g. brilliant Venus can reach up to -4.6, while the North Star is dimmer at +2).<\/div>\n

The spacecraft needs an antenna that big because it’s been specifically designed for sending and receiving 4G<\/a> and 5G<\/a> mobile signals between the space-based platform and regular mobile handsets on the ground (early tests have gone well<\/a>). Just one of these satellites has a Field of View (FoV) of over 300,000 square miles across the surface of the Earth.<\/p>\n

However, as we’ve already seen with the complaints raised by astronomers against SpaceX’s mass of significantly smaller Starlink<\/a> platforms (something they’ve moved to tackle – here<\/a>), highly reflective satellites can disrupt observational sciences (e.g. imaging\/studying stars, planets and looking for dangerous asteroids etc.).<\/p>\n

The New Study<\/strong><\/span><\/h3>\n

According to Nature<\/a>, a group of professional and amateur astronomers recently embarked on an international observation campaign, ultimately spotting the BW3 satellite<\/a> and recording its shine on the magnitude scale from locations in Chile, the United States, Mexico, New Zealand, the Netherlands and Morocco.<\/p>\n

Extract from Nature’s Report<\/strong><\/p>\n

On 10 November 2022, the satellite unfurled its array of antennas, causing it to brighten to magnitude +0.4. If it were a star, it would have been one of the ten brightest in the sky. But its apparent brightness changes as the satellite rotates, and by late December, it had dimmed to a magnitude of +6. It then brightened again, reaching magnitude +0.4 once more on 3 April 2023.<\/p>\n

The International Astronomical Union recommends that satellites in Low Earth Orbit (LEO) should have a maximum brightness of magnitude +7. BlueWalker 3 can be hundreds of times brighter, the authors found.<\/p><\/blockquote>\n

The real trouble here isn’t so much BW3 as the commercial satellites that are expected to follow. AST has plans to launch 5 commercial BlueBird <\/strong>satellites in the first quarter of 2024 (these will initially be of a similar size to the experimental BW3). But the company also holds an aspiration toward launching a total of up to 100 satellites, with future models being even larger and more capable.<\/p>\n

The good news is that AST, much like Starlink<\/a> before them, appears to be amenable to dimming its satellites and their next-generation ones are thus due to adopt anti-reflective materials, as well as using certain flight manoeuvres to reduce the crafts\u2019 apparent magnitude. Only time will tell how effective this is. But whether other companies and countries will show a similar regard for these concerns remains to be seen.<\/p>\n","protected":false},"excerpt":{"rendered":"

A new report has revealed that the prototype BlueWalker 3 satellite in Low Earth Orbit (LEO), which was launched by AST SpaceMobile to provide 4G and 5G mobile (broadband) coverage to regular handsets on the ground, is so big that it outshines 99% of the stars visible from a dark location on Earth – that’s […]<\/p>\n","protected":false},"author":1,"featured_media":32910,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[61,406,60,77],"class_list":["post-35892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-4g","tag-5g","tag-mobile-broadband","tag-satellite"],"share_on_mastodon":{"url":"https:\/\/mastodon.social\/@ispreview\/111170290639602634","error":""},"yoast_head":"\nReport Warns New BlueWalker 3 Satellite for Mobile is Too Bright - ISPreview UK<\/title>\n<meta name=\"description\" content=\"A new report has revealed that the prototype BlueWalker 3 satellite in Low Earth Orbit (LEO), which was launched by AST SpaceMobile to provide 4G and 5G\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ispreview.co.uk\/index.php\/2023\/10\/report-warns-new-bluewalker-3-satellite-for-mobile-is-too-bright.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Report Warns New BlueWalker 3 Satellite for Mobile is Too Bright - 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