TC_209 [he/him, comrade/them]

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Joined 4 years ago
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Cake day: August 14th, 2020

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  • “These heroes in Russia who have immortalized their cause, our cause, who have paid in overflowing measure in blood and tears and agony unspeakable, the price of their fidelity and devotion to the oppressed and exploited toilers not only of their own land but of the whole world, now appeal to us for the food that shall save them from perishing as hostages to starva- tion, and shall we now fail to return in small party what we owe them for what they have suffered in the awful years of the revolution to break the fetters of labor everywhere and set humanity free from the curse of the ages?” – some tankie I guess






  • The primary source of the linked article: https://arxiv.org/abs/2409.20432

    Observed magnitudes of Qianfan spacecraft range from 4 when they are near zenith to 8 when low in the sky.

    Since this is the first run of the Qianfan satellite constellation, the most appropriate comparison would be to Starlink’s original satellites. As you can see below, the notion that China’s satellites are “significantly brighter than those of Western systems” is a inaccurate.

    A 2022 paper on Starlink Original, VisorSat and Post-VisorSat models: https://arxiv.org/pdf/2210.17268

    The Original spacecrafts have a relatively flat phase function, so they are comparatively bright over a wide range of phase angle. […] the characteristic magnitudes are: 4.7 (Original) […]

    A 2024 paper on Starlink newer Direct-to-Cell satellites: https://arxiv.org/abs/2407.03092

    The mean apparent magnitude of Starlink Mini Direct-To-Cell (DTC) satellites is 4.62 while the mean of magnitudes adjusted to a uniform distance of 1000 km is 5.50.

    Clearly, even the newest Starlink satellites are well above the magnitude 7 limit astronomers recommend for satellite brightness.