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Brightness of the Qianfan Satellites

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arxiv 2409.20432 v1 pith:GXFPG3PI submitted 2024-09-30 astro-ph.IM

Anthony Mallama , Richard E. Cole , Bram Dorreman , Scott Harrington , Nick James This is my paper · ORCID
classification astro-ph.IM
keywords brightnessqianfansatelliteswhenantennaarrayastronomicalflat
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Observed magnitudes of Qianfan spacecraft range from 4 when they are near zenith to 8 when low in the sky. Nearly all of the observations can be modeled with a nadir-facing flat antenna panel and the underside of a zenith-facing solar array, both with Lambertian reflectance properties. These satellites will impact astronomical research unless their brightness is reduced.

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  1. Brightness Characteristics of the Qianfan Satellites and Evidence That Some Are Tumbling

    astro-ph.IM 2025-05 conditional novelty 5.0 of 10

    Qianfan satellites average apparent magnitude 5.76 (5.24 at 1,000 km), and several failed Launch 2 spacecraft show periodic brightness fluctuations indicating tumbling.

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