Additional file 4 of A low-dispersion spectral video camera for observing lunar impact flashes

Additional file 4. Additional_SER_video_files: The spectra of Flash170201 can be derived from these files. We cropped the video frames to reduce the file sizes. Ser-format videos can be viewed by an open-source application, “SER Player (2021).” (1) Flash170201.ser: Flash170201. The flash appears in the 51st-frame. The bright area at the upper right is the Aristarchus area. The original frame size is 960 × 592 pixels. We extracted one hundred frames of 200 × 200 pixels in size. The coordinate of their upper-left pixel is (670, 290) in the original frames, in which the coordinate of the upper-left pixel is (0, 0). We averaged 495 frames while shifting images to compensate for slight image motion in obtaining the background image. Therefore, the analyses of this cropped video may lead to slightly different results from ours. (2) TYC4665-715-1.ser: Comparison star. A faint star at the lower left is TYC4665-463-1. The original frame size is 960 × 592 pixels. We extracted one hundred frames of 120 × 100 pixels in size. The coordinate of their upper-left pixel is (355, 315) in the original frames. We averaged all frames while shifting images to compensate for slight image motion. (3) alpha-And_No5.ser: α And recorded at the center of the original video frames. The original frame size is 1936 × 1216 pixels. We extracted one hundred frames of 120 × 100 pixels in size. The coordinate of their upper-left pixel is (870, 538) in the original frames. We discarded five bad frames and averaged the other frames while shifting images to compensate for slight image motion. (4) alpha-And_No6.ser: α And recorded near the right edge of the original video frames. The original frame size is 1936 × 1216 pixels. We extracted one hundred frames of 120 × 100 pixels in size. The coordinate of their upper-left pixel is (1780, 538) in the original frames. We discarded one bad frame and averaged the other frames while shifting images to compensate for slight image motion. (5) dark_for_Flash170201.ser, dark_for_TYC4665-715–1.ser, dark_for_alpha-And_No5.ser, dark_for_alpha-And_No6.ser: Dark frames for the SER videos mentioned above. These were recorded while we covered the camera with an opaque cap. The camera settings were the same between the non-dark and dark videos.附加文件4：Additional_SER_video_files（SER格式视频文件）：本数据集可用于推导Flash170201的光谱数据。我们对视频帧进行了裁剪以减小文件体积。SER格式视频可通过开源应用程序「SER Player (2021)」进行查看。 (1) Flash170201.ser：对应目标Flash170201。该视频的第51帧中出现闪光现象，画面右上方的亮区为阿里斯塔克斯区域。原始帧分辨率为960 × 592像素。我们从中裁剪出100帧尺寸为200 × 200像素的子图像，其在原始帧中的左上角像素坐标为(670, 290)（原始帧左上角像素坐标定义为(0, 0)）。为获取背景图像，我们对495帧图像进行了平均叠加，并通过图像配准补偿了轻微的图像运动。因此，基于本裁剪视频的分析结果可能与我们的原始分析存在细微差异。 (2) TYC4665-715-1.ser：用于对比的恒星。画面左下方的暗弱恒星为TYC4665-463-1。原始帧分辨率为960 × 592像素。我们从中裁剪出100帧尺寸为120 × 100像素的子图像，其在原始帧中的左上角像素坐标为(355, 315)。我们对所有帧进行了平均叠加，并通过图像配准补偿了轻微的图像运动。 (3) alpha-And_No5.ser：α And的观测视频，目标位于原始视频帧的中心位置。原始帧分辨率为1936 × 1216像素。我们从中裁剪出100帧尺寸为120 × 100像素的子图像，其在原始帧中的左上角像素坐标为(870, 538)。我们剔除了5帧劣质帧后，对剩余帧进行了平均叠加，并通过图像配准补偿了轻微的图像运动。 (4) alpha-And_No6.ser：α And的观测视频，目标位于原始视频帧的右侧边缘附近。原始帧分辨率为1936 × 1216像素。我们从中裁剪出100帧尺寸为120 × 100像素的子图像，其在原始帧中的左上角像素坐标为(1780, 538)。我们剔除了1帧劣质帧后，对剩余帧进行了平均叠加，并通过图像配准补偿了轻微的图像运动。 (5) dark_for_Flash170201.ser、dark_for_TYC4665-715-1.ser、dark_for_alpha-And_No5.ser、dark_for_alpha-And_No6.ser：上述SER格式视频对应的暗场帧。我们通过用不透明遮光罩覆盖相机的方式录制了这些暗场视频，其相机拍摄参数与非暗场视频完全一致。