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Ursa Astronomical Association

Rocket-related clouds - 23.3.2023 at 20.10 - 23.3.2023 at 21.00 Lohja Observation number 116590

Visibility I / V

Jari Virtanen, Ursa (Etelä-Suomi)

The BROR exam in Kiruna was planned for 12-22.3, but the weather prevented the start and the top. starting company and ilm. the last such batch was added on 23.3. On Thursday 16.3, I was already at the shooting location, until the departure was interrupted 1/2 hour before the departure based on the data of the weather balloon sent. After a week I was at the same place for the second time. I followed the departure with my cell phone and when the rocket was launched, I looked at the sky and there it was already first. barium cloud in the sky! Fortunately, I already started the cameras 10 minutes earlier. The telephoto lens was in the right direction, but after a few more barium clouds I had to hastily raise it to fit the uppermost clouds into the field of view. Fortunately, the cloud situation was good enough that the test could be seen from 860 km away. As far as I know, first the barium clouds were released into the ionosphere at an altitude of about 100 km, but I have not found any information about the altitude at which the highest barium balls were released. It was mentioned somewhere that this rocket combination reaches up to 250 km.

K.1 5. cloud.

Vid.1. Timelapse body tele at 20:20-20:34. 2 s , 6 s inside. ISO 3200, f/2.8.

Vid. 2. Timelapse body 20 mm. from 20:22 to 20:57. 4 sts, 5 sts inside. ISO 2000, f/2.2. Images processed to make the clouds stand out better. The Cha Cha Cha of the Aurora Borealis wasn't quite so green as a wrapper to the naked eye...

Vid. 3. A close-up timelapse showing the movement of the rocket itself in many pictures and apparently also another object in several frames near it.

Q.2. A single image, a rocket at the top and a 2nd target next to it.

Vid.4. The final stages of the barium cloud dances. at 20:34 - 20:45.

K.3. Of the cameras, the D800 was right on time, but the D7500's clock was 16 seconds behind. I measured this the next day from the EXIF time by taking a cartoon of the combination PC+ VTT's virall. time web page + tablet (ntp app) + phone (ntp app).

Estimated cloud times: 20:24:21 - 20:29:30 so that the release intervals were 25, 25, 35, 35, 130, 35 and 25 s.

I finally decided to estimate the release heights of the clouds. Helped by the PhotoPills app (Esrange et. 861 km, 3.5 deg below the horizon), Stellarium (I removed the refraction correction for the stars), position of nearby stars and estimated et. 865 to 921 km. Release altitudes: 116 - 145 - 175 - 207 - 230 - 209 - 186 - 163 km. The apogee of the runway is approx. 237 km.

More similar observations
Additional information
  • Havainto
    • Rocket-related clouds
  • Cloud coverage in the sky
    • Covered 1/8 of the sky
  • Rocket launch
    • Rocket phase visible in the sky info
    • Barium cloud info

      Barium clouds have very rarely been seen in the sky during rocket launches. Typically a space organization has done an experiment in which a barium cloud is released into the upper atmosphere.


Comments: 1 pcs
Tero Sipinen - 9.6.2023 at 20.15 Report this

Todella upea setti bariumkokeesta! Onneksi pilvisyystilanne oli suosiollinen, onnittelut!

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