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arXiv 2407.03092astro-ph.IM
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Starlink Direct-to-Cell 卫星的亮度表征

Brightness Characterization for Starlink Direct-to-Cell Satellites

Anthony Mallama, Richard E. Cole, Scott Harrington, J. Respler

AI总结:

本文测量了Starlink Mini Direct-to-Cell卫星的亮度,发现其亮度约为同类卫星的4.9倍,并分析了天线、姿态、轨道高度及地球阴影时间对天文观测影响的综合效应。

摘要:

Starlink Mini Direct-To-Cell(DTC)卫星的平均视星等为4.62,而归一化到1000公里统一距离后的平均星等为5.50。在相同距离下,DTC卫星的平均亮度是其他Starlink Mini航天器的4.9倍。目前我们无法区分DTC天线本身的影响、DTC运行可能需要的不同姿态模式,以及在我们观测时亮度缓解措施实施到何种程度。在最理想的情况下,即DTC的亮度缓解措施与其他Mini卫星同样成功,且DTC天线不会显著增加亮度,我们估计基于其较低的轨道高度,DTC卫星的亮度将是其他卫星的约2.6倍。DTC卫星在地球阴影中度过的时间比例比更高轨道的卫星更大。这将在一定程度上抵消它们对天文观测的部分影响。

英文摘要:

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. DTCs average 4.9 times brighter than other Starlink Mini spacecraft at a common distance. We cannot currently separate the effects of the DTC antenna itself, the different attitude modes that may be required for DTC operations and to what extent brightness mitigation procedures were in place at the times of our observations. In a best case scenario, where DTC brightness mitigation is as successful as that for other Minis and the DTC antenna does not add significantly to brightness, we estimate that DTCs will be about 2.6 times as bright as the others based upon their lower altitudes. The DTCs spend a greater fraction of their time in the Earth's shadow than satellites at higher altitudes. That will offset some of their impact on astronomical observing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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