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以观测时间T=0.5年,四种不同的旋转角ξ=30°、36°、43°和50°,计算了依巴谷卫星对50颗全天均匀分布的恒星模拟观测次数。发现随着黄纬的增加,观测次数逐渐增加。当|β|=40°～60°时,观测次数分布达极大。而|β|=0°～10°之间,观测次数约只有极大值的1/2。计算符合Hoyer等人的理论估计,即在|β|=90°—ξ附近观测次数最多,在黄道面附近的恒星观测次数最少。本文指出依巴谷卫星对|β|为50°～60°区域内的恒星观测精度高。原因是在这一区域内,依巴谷扫描观测的次数最多。
Based on the observation time of T = 0.5 years, four different rotation angles ξ = 30 °, 36 °, 43 ° and 50 °, the number of simulations of 50 full-day stellar observations by Iba Valley satellite was calculated. It is found that the number of observations gradually increases with the increase of yellow latitude. When | β | = 40 ° ~ 60 °, the distribution of observations is extremely large. And | β | = 0 ° ~ 10 °, the number of observations is only about 1/2 of the maximum. The calculation is in accordance with the theoretical estimation of Hoyer et al. That the number of observations near | β | = 90 ° -ξ is the highest and the number of stars near the ecliptic surface is the least. This paper points out that the Iba Valley satellite has high observability for the | β | in the region of 50 ° ~ 60 °. The reason is that in this region, Iba Valley scans the most frequently.