Cees Bassa

I've tried to explain this in this thread bsky.app/profile/cbas... For each image pixels along a vertical line from (approximately) South to North are taken and concatenated. The 15 seconds cadence is then averaged to once a minute. In the yearlong keogram each daily keogram is averaged to 4 pixels.

We bounced a radio signal off Venus' surface! On 17+18 Oct the Dwingeloo Radio Telescope transmitted and Astropeiler Stockert received the echoes, 42 million km each way. We decoded a 10-character message from the echo. We're not finished yet: more echos on 24+25 Oct. www.camras.nl/en/blog/2026...

New blog post: X-engine correlator on a Ryzen NPU. A few months ago I posted about the basics of NPUs in Ryzen AI chips. I wanted to tackle a real-world problem to get more experience, so I've implemented an X-engine correlator like the ones used in radio astronomy.

As a result of the recent news, we have received an extraordinary number of messages, and it has been incredibly moving to read so many heartfelt expressions of support. www.jodrellbank.net/explore/stor...

CCSDS 8192-bits CADUs, RSS 223/255 I=4

We're still tracking #Artemis II with the Dwingeloo radio telescope, with four very enthousiastic amateurs staying up all night in the control room. We just witnessed the Orion upper stage separation burn in our doppler tracking.

A first view on Artemis II from South America on 2026-04-02, 01:57:58 UTC

We are tracking #Artemis II with the historic Dwingeloo radio telescope. In the doppler shift of the carrier signal we see the manual manoevers that the astronauts perform while flying formation with the upper stage.

We have AOS from #Artemis II!

The #fireball of 8 March was captured on camera by DAARO! on the roof of ASTRON.

What is the origin of 1LHAASO J0343+5254u? by @hen_edler, @itsMariaArias, myself, @cbassa.bsky.social Our multi-band analysis suggests that the PWN candidate previously proposed to be its origin is actually an obscured galaxy cluster, unrelated to the LHAASO emission arxiv.org/abs/2603.03164

It still seems unreal to me that humans will soon be flying back to the moon! They will be returning to Earth at a speed of 40.000 km/h, the fastest ever reentry of a crewed spacecraft. This remastered video shows a similar reentry from the #Artemis 1 mission back in 2022 at 9x speed. 🔭🧪

Great aurora visible in Dwingeloo yesterday!

An absolutely awesome display of Northern Lights over the Netherlands during the past hour! Red glow in the North and a green curtain passing over whose motion was very obvious with the naked eye. This is 1 hour worth of 15 second exposures with my all sky camera from 21to 22UTC. #auroraBorealis

Picking up the old hobby of catching radio signals from newly launched satellites. These are 5 satellites from the Space X launch that happened less than 3 hours ago. Signals from 4 CONNECTA IOT satellites on 401.5MHz and 2240MHz, as well as CarbSAR at 2243.333MHz.

Last Thursday, a group of European radio telescopes (HyperFlash / ÉCLAT) detected a flash from the repeating Fast Radio Burst discovered end of December. We also detected this burst! Our detection came in too late to be included in the telegram, but here it is! www.astronomerstelegram.org?read=17588

Snow in Dwingeloo. #bluesky

I put together a mosaic of 2025 from the timelapse camera on my roof jwheare.com/year-mosaic/... (not a keogram, but inspired by @cbassa.bsky.social)

Happy new year! My all sky camera imaged the sky every 15 seconds and this picture shows what happened in the sky in 2025. It shows the length of the night and day with the hourglass shape, the monthly lunar cycle with the diagonal bands, the elevation of the Sun at local noon, and lots of clouds.

It's cleared up in Sydney and I can see the shadow creeping across the Moon! 🥳🌚🔭

💥Greater (partial) success for #amateurradio and #amsat satellite operators in dispute with AST Spacemobile over commercial use of the 430-440 MHz amateur radio band for TT&C! 💥 In its reference Attachment to the recent grant, dated August 29, 2025, the FCC imposes clear limits ⬇️

NOAA-15 was decommissioned today at 15:26 UTC, with its AVHRR/3 Instrument still in better state than the last 2 remaining on MetOp-B & C. It wouldn't be so disappointing if this wasn't done for the wrong reasons... Makes you wonder what happened to NOAA.

Here, strf was used by the UVSQSat-NG team : - at the beginning of the mission to optimize the preliminary TLEs so that the university could establish the most reliable communication possible, - for monitoring purposes since refined TLEs have become available... Thank you for the great work!

Unfortunately the surface of the Moon is also quite hard.

We lost HAKUTO-R M2 signal suddenly

We have lost signal of Hakuto-R M2 Resilience! We saw the signal and its Lunar reflection close to each other before LOS, indicating that it was very close to the surface when the signal disappeared. Space is hard!

We are now tracking the landing attempt of #Hakuto-R Mission 2 #Resilience. Check our livestream at www.youtube.com/live/C7-MQ2U...

On the occasion of the @unesco.org International Day of Light, we created a 'light painting' using the Dwingeloo Telescope by mounting a light bulb at the focus for half an hour. #lightday2025 @idlofficial.bsky.social

And Magritte fans 😀

Two days too late and perhaps only funny for those speaking Dutch. (H/T Gemma Janssen.)