Astronomie Stiftung Trebur
Image credit: Rainer Schaffner, 6" Newton f/4, 1/1000s, ASI 533 MC pro
On 19 September 2025, the Moon passed in front of Venus. We observed the event, which took place in the daytime sky at around 2.00 pm CEST, using the T1T and another telescope (Newton 6" f/4), and recorded it on video.
Times of the T1T recording:
Start of ingress on the night side of Venus: ~ 12:05:47 UT
Start of ingress at the day-night boundary ~ 12:05:52 UT
End of ingress ~ 12:06:17 UT
Each with an estimated reading accuracy on Stellarium of ~ 1 second. All data determined using Stellarium.
Imaging details:
T1T focal length = 9510 mm
Camera: QHY 174M
Filter: Cousins-IR
Exposure time per frame = 1 ms
Frames per second = 548 fps
Image size: 32‘ x 32’
https://www.youtube.com/watch?v=jViE91m6VQw
Data from the Newtonian telescope observation:
1248 individual images
Interval: 5s
Exposure: 1/1000 s
Of which 7:30 mins before occultation as time-lapse
Camera: ASI 533 MC Pro