Grootste commerciële satellieten ontvouwen zich en overstralen de nachtelijke hemel

Het tijdperk van irritant grote satellieten is aangebroken en gaat ons zicht op de glinsterende kosmos belemmeren. Vijf van de grootste communicatiesatellieten ooit gebouwd zijn onlangs uitgevouwen in een baan om de Aarde. Het is het

https://www.kuuke.nl/grootste-commerciele-satellieten-ontvouwen-zich-en-overstralen-de-nachtelijke-hemel/

#ASTSpaceMobile #astronomie #Bluebird #Bluewalker3 #satelliet

As these objects are comparable in size to the prototype #BlueWalker3 (which reached magnitude zero under certain conditions), expect them to be of the same order.

https://news.satnews.com/2024/09/09/spacex-to-launch-ast-spacemobile-bluebird-satellites-each-the-largest-communications-array-ever-deployed-in-low-earth-orbit/

#Satellites #Space #ASTSpaceMobile

This ensures that more big, bright #satellites are coming: "A Block 1 satellite would have 10 times the capacity of the company’s 1,500-kilogram BlueWalker-3 prototype; [Block2] would be twice as big and have 10 times the capacity of a Block 1 BlueBird." (via @spacenews_inc)

(Also, a reminder that this comms mode is potentially very harmful to ground-based radio astronomy.)

https://spacenews.com/verizon-plots-100-million-direct-to-smartphone-satellite-investment/

#Space #Astronomy #SCS #BlueWalker3 #ASTSpaceMobile

Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy.

Current orbiting constellation satellites have brightnesses between apparent magnitudes 4 and 6,
whereas in the near-infrared Ks band, they can reach magnitude 2.

Radio emissions induce further potential risk to ground-based radio telescopes that also need to be evaluated.

Here we report the outcome of an international optical observation campaign of a prototype constellation satellite,
👉AST SpaceMobile’s BlueWalker 3.

#BlueWalker3 features a 64.3 m2 phased-array antenna as well as a launch vehicle adaptor (LVA).
The peak brightness of the satellite reached an apparent magnitude of 0.4.
💥This made the new satellite one of the brightest objects in the night sky. 💥

Additionally, the LVA reached an apparent V-band magnitude of 5.5,
💥four times brighter than the current International Astronomical Union recommendation of magnitude 7 💥

The expected build-out of constellations with hundreds of thousands of new bright objects1 will make active satellite tracking and avoidance strategies a necessity for ground-based telescopes

Satellite operators, astronomers and other users of the night sky must develop brightness mitigation strategies.

https://www.nature.com/articles/s41586-023-06672-7

Our IAU Centre for the Protection of the Dark and Quiet Sky from Satellite Constellation Interference paper on observations of the #BlueWalker3 prototype #satellite is finally out in the latest print edition of Nature accompanied by a News & Views piece by @sundogplanets.

https://www.nature.com/nature/volumes/623/issues/7989

#Astronomy #Space #SpaceSustainability #LEO

"The spectacle offered by a very dark night sky no longer just contains stars and planets that are standing still. We now also see numerous satellites… and only their movement allows us to distinguish them from the natural stars."

https://english.elpais.com/science-tech/2023-11-06/boom-in-satellites-changes-the-sky-forever.html

#Satellites #Space #Astronomy #BlueWalker3 #Starlink #NightSky

#Verpasstodon

Der erste von 100: Riesensatellit BlueWalker 3 heller als fast alle Sterne

AST SpaceMobile will mit riesigen Satelliten Smartphones online bringen. Nun bestätigt eine ausführliche Analyse die Befürchtungen in der Astronomie.

https://www.heise.de/news/Studie-zu-Riesensatellit-BlueWalker-3-Bisweilen-heller-als-fast-alle-Sterne-9330965.html?wt_mc=sm.red.ho.mastodon.mastodon.md_beitraege.md_beitraege

#ASTSpaceMobile #Astronomie #Bluewalker3 #Internetzugang #Lichtverschmutzung #Satelliten

#FR:

"„Besorgniserregender Trend“ – Fachleute sehen „immer drängenderes Problem“ am Nachthimmel"

".. Studie mit neuen Details zum Satelliten „BlueWalker 3“.."

https://www.fr.de/wissen/erdorbit-satellit-bluewalker-nachthimmel-hell-astronomie-besorgniserregender-trend-problem-studie-weltraum-zr-92564449.html

8.10.2023

#Astronomie #BlueWalker3 #Nachthimmel #Raumfahrt #Satelliten #Weltraum