ISS flyby trail.

Feb 20th, 2020

2 m

A photograph of the ISS transit, taken on February 3, 2020. It underwent deeper processing on February 18 and 19. First, I captured a series of flats (25 frames at 1/8 second exposure) to correct vignetting, edited them, and posted the result on Instagram. This was the first processing pass, done on February 14 and 15. Later, I discovered a huge number of hot pixels, so I captured a series of biases (28 frames at 1/4000 second exposure). But then I remembered that biases correct read noise, and hot pixels are not that. I had to capture a series of darks (7 frames with exposures ranging from approximately 134 seconds to 138 or 137 seconds). I had to stack and process everything again a second time. In the end, the hot pixels were almost completely gone, and I was satisfied with the result. I ask those viewing this photo to please comment if I made any mistakes in the processing or if you have any useful tips for shooting and processing astrophotography images. Summary: Lights: 1 frame. Darks: 7 frames. Biases/Offsets: 28 frames. Flats: 25 frames.

Feb 3rd, 2020

2 m

Capture Date: February 3, 2020. Aperture: f/3.5. Focal Length: 18mm. I attempted to photograph the ISS pass on February 1 and 2, but the results from those sessions were less than ideal. Only today did I manage to get a good shot.