科罗拉多紫外Transit实验（CUTE）任务的在轨性能
The on-orbit performance of the Colorado Ultraviolet Transit Experiment (CUTE) Mission
摘要：
我们提出的科罗拉多紫外线过境实验（$CUTE$）的在轨性能。$CUTE$是2021年9月27日发射的6 U CubeSat，正在获得短周期系外行星的近紫外（NUV，2480 A - 3306 A）过境光谱。该仪器包括一个20厘米的$\times$ 8厘米矩形卡塞格伦望远镜，一个NUV光谱仪与全息直纹像差校正衍射光栅，和一个被动冷却，背照NUV优化CCD检测器。望远镜通过一个18 $'$ $\times$ 60 $''$狭缝向摄谱仪提供信息。航天器总线是Blue Canyon Technologies XB 1，它已证明在56%的$CUTE$科学曝光中$\leq$ 6 $''$抖动。在航天器调试之后，执行了在轨校准程序，以表征$CUTE$仪器的在轨性能。该校准的结果表明，$CUTE$的有效面积为$\approx$ 19.0 - 27.5 cm $^{2}$，并且在整个带通上的平均本征分辨率元件为2.9 A。本文介绍了科学仪器性能参数的测量以及天文台的热特性和指向特性。
英文摘要：
We present the on-orbit performance of the Colorado Ultraviolet Transit Experiment ($CUTE$). $CUTE$ is a 6U CubeSat that launched on September 27th, 2021 and is obtaining near-ultraviolet (NUV, 2480 A -- 3306 A) transit spectroscopy of short-period exoplanets. The instrument comprises a 20 cm $\times$ 8 cm rectangular Cassegrain telescope, an NUV spectrograph with a holographically ruled aberration-correcting diffraction grating, and a passively cooled, back-illuminated NUV-optimized CCD detector. The telescope feeds the spectrograph through an 18$'$ $\times$ 60$''$ slit. The spacecraft bus is a Blue Canyon Technologies XB1, which has demonstrated $\leq$ 6$''$ jitter in 56% of $CUTE$ science exposures. Following spacecraft commissioning, an on-orbit calibration program was executed to characterize the $CUTE$ instrument's on-orbit performance. The results of this calibration indicate that the effective area of $CUTE$ is $\approx$ 19.0 -- 27.5 cm$^{2}$ and that the average intrinsic resolution element is 2.9 A across the bandpass. This paper describes the measurement of the science instrument performance parameters as well as the thermal and pointing characteristics of the observatory.
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