标题： 首次蓝鸟太空船的观测及其亮度模型 显示英文标题

标题： Initial Observations of the First BlueBird Spacecraft and a Model of Their Brightness

摘要： 基于大量的视觉观测，BlueBird卫星的平均视星等为3.44，而调整到1000公里统一距离后的平均星等为3.84。在天顶附近，航天器可以亮至0.5等。虽然这些航天器足够明亮，足以影响天文观测，但它们有时会比BlueWalker 3原型卫星更暗。对其亮度的模型表明，自BlueWalker 3任务以来的设计变化可以解释BlueBird的行为。 显示英文摘要

摘要： Based on a large set of visual observations, the mean apparent magnitude of BlueBird satellites is 3.44, while the mean of magnitudes adjusted to a uniform distance of 1000 km is 3.84. Near zenith the spacecraft can be as bright as magnitude 0.5. While these spacecraft are bright enough to impact astronomical observations, they can for periods be fainter than the BlueWalker 3 prototype satellite. A model for their brightness shows that design changes since the BlueWalker 3 mission can explain the behavior of BlueBird.