Doppler monitoring Tianwen 2's frequency with @amsat-dl.org's 20m dish in Bochum shows a frequency jump on 11 June, which means that a small manoever happened on that date.

We think a Tianwen-2 manoever happened early 7 June, as expected. With the Bochum telescope (@amsat-dl.org) and the Dwingeloo telescope, we observe that a) Tianwen-2 is close to the asteroid on the sky and b) the change in the line-of-sight velocity (Doppler) now almost matches that of the asteroid.

Tracking #tianwen2 for a few days, we see that the Chinese spacecraft is clearly getting closer to the asteroid Kamo'oalewa. According to online rumors (see wikipedia's reference to a post from Andrew Jones), it would arrive 7 June 2026. That seems consistent with our observations so far.

The Dwingeloo telescope is currently tracking the Chinese spacecraft Tianwen-2, which is on its way to asteroid Kamo'oalewa. We're live streaming our reception to websdr.camras.nl:8901?tune=8428158

New blog post: Decoding Tianwen-2. I analyze the telemetry decoded from recent @radiotelescoop.bsky.social recordings of Tianwen-2. Compared to Tianwen-1, there is not much in the telemetry. There are not that many fields and most are mainly static. Read more: destevez.net/2026/05/deco...

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

With the 25m Dwingeloo radio telescope, we just tracked #Tianwen-2 on X-band. It was at an offset of 1.1 degrees from asteroid Kamo'oalewa, which it is going to visit. We recorded IQ data, maybe others can decode this (@destevez.net, @aang23.satdump.org?). Data at data.camras.nl/satellites/r....

It's the anniversary of the Dwingeloo radio telescope: it was opened by Queen Juliana on 17 april 1956. We celebrated this during the lunch break by reenacting the opening ceremony, with Roelie as her majesty and Michel as Professor Oort. We used the original button, which we recently rediscovered.

We just observed the Return Trajectory Correction Burn 2 of #Artemis II in Doppler tracking. We saw a ~3 Hz jump, corresponding to a line-of-sight velocity change of about 0.4 m/s.

Using the Dwingeloo telescope (which predates spaceflight!) we are tracking the carrier frequency of #Artemis II. Maneuvers cause slight changes in that frequency. We annotated the timestamps of Day 1's proximity operations demonstration and we are measuring velocity changes of just a few m/s!

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.

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!

In preparation for Artemis II, the Bochum and Dwingeloo radio telescopes, configured as an interferometer, jointly observed quasar J2136+0041 at S-band. (Team: @radiotelescoop.bsky.social @telkamp.eu Bochum Observatory, Peter Gülzow DB2OS)

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

The LOFAR survey of the low-frequency radio sky required a tremendous amount of effort. 12,950 hours of observation. 20 million hours of computer processing to extract 18.6 petabytes of data. The end result is a cosmic map unlike any seen before. 🔭🧪 www.arxiv.org/abs/2602.15949

Great aurora visible in Dwingeloo yesterday!

Keep an eye on our website (www.camras.nl) and this account for the official announcement of the CAMRAS-seminar which takes place 14 March. The title is 'Waterstof in je achtertuin', the subject is amateur observing of the neutral hydrogen line. The event will be mainly in Dutch. #savethedate

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

Vanavond speelt de radiotelescoop mee in het muziekstuk "Le noir de l'étoile", dat in Freiburg wordt uitgevoerd. Wij sturen live het tikken van pulsar B0329+54 door naar de concertzaal, waar zes percussionisten het ritme van de pulsar overnemen. www.rtvdrenthe.nl/nieuws/17957...

Wij doen mee met de #nachtvandenacht op zaterdagavond 25 oktober. Op deze avond geven we rondleidingen in de radiotelescoop, bij helder weer staan er optische kijkers buiten, en er zijn doorlopende lezingen in het Mullerhuis. Reserveren kan via www.camras.nl

RTV Drenthe maakte naar aanleiding van 75 jaar @astron de driedelige documentaire 'Gefluister uit het duister'. In deel 1 is de radiotelescoop Dwingeloo uitgebreid in beeld. Vanavond verschijnt deel 2. Terugkijken kan via www.rtvdrenthe.nl/tv/programma...

Knap mistig in Dwingeloo! Foto: Arno Schoenmakers.

Thomas Telkamp, PA8Z, presented @radiotelescoop.bsky.social at the Bochum Space Days, and we just looked at Voyager-1 downlink signal with the ourv20m dish in Bochum again after first receive in 2006.

Morgen, zondag 14 september, is de telescoop open voor #openmonumentendag. In de vroegere directeurswoning, ook een monument, hebben we historische elektronica opgesteld. Wees welkom om van dichtbij te kijken! Voor een rondleiding in de telescoop is een reservering nodig, via www.camras.nl

Some passers-by at the telescope today.

Op zo 6 juli is de landelijke #zonnekijkdag. We geven demonstraties met de radiotelescoop, en een zonne-expert van ASTRON geeft een korte lezing. Er is bepaald geen blue sky voorspeld, dus misschien is de radiotelescoop wel de enige locatie waar we de zon live waarnemen. Reserveer via www.camras.nl

Same in Bochum.. shortly after the end of braking and start of pitching maneuver.. 😢

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...

An excellent thread with measurements of radio recombination lines with the historic Dwingeloo radio telescope. These are the first such measurements since the restoration of the telescope.

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

Just listening to the Voyager 1 signal on a Wednesday evening. More than 23 light hours away (25 billion km). Of course with the historic @radiotelescoop.bsky.social!

After fixing this mistake, the frequency difference is on the order of 1 Hz. This is about 0.7 ppb, so it is within the accuracy that we could expect for the GPSDO at Bochum. So mystery solved!

Op zondag 27 april geven we weer demonstraties van de radiotelescoop Dwingeloo. Op het programma staat altijd live-signaal van onze 'huispulsar' B0329+54, meestal een ver sterrenstelsel, een supernovarestant of gewoon de zon. De ruimte is beperkt, dus reserveren is nodig, via www.camras.nl

The signal can be detected both in the Dwingeloo and Stockert 25 m radio telescopes, but the performance of Dwingeloo is poorer. The observed Doppler spread is on the order of ±0.75 Hz, which is a bit less than the spread model I made. Read more: destevez.net/2025/04/anal...

New blog post: Analysis of the CAMRAS Venus radar experiment. A deep dive into the Earth-Venus-Earth L-band radar experiment done in March by @radiotelescoop.bsky.social, Astropeiler Stockert, the Deep Space Exploration Society, and Open Research Institute. 🧵

A bit late, but here is some additional analysis of the Earth-Venus-Earth radar experiments with @radiotelescoop.bsky.social from March 22nd, 2025. It takes the 4 recordings at the Dwingeloo and Stockert telescopes and searches in Doppler frequency and Doppler rates for the radar reflections.

The data we collected during our successful Earth-Venus-Earth experiment is now available at data.camras.nl/venus/, including an example notebook by @telkamp.eu showing how the reflection of our signal off the surface of Venus can be detected in this data.

Duitse astronaute Rabea Rogge is nu onderweg naar het ISS. Ze geeft 9:25 (nu dus) vanuit de capsule een interview aan de TU Berlin. Wij luisteren met de telescoop mee en stream naar websdr.camras.nl:8901?tune=437550fm . Livestream van de TU Berlin: www.youtube.com/live/qaL-D4d...

De maan was vandaag niet de enige die een 'hapje uit de zon' nam. #zonsverduistering

We hebben vandaag de gedeeltelijke #zonsverduistering ook met de radiotelescoop waargenomen. De periode dat de radioruis van de zon afnam doordat de maan ervoor zat, was iets langer dan de optische eclips. Dat komt doordat de radiogolven van de zon ook uit de corona rondom de zon komen.

This was quite the project to have been involved in (if only minor). Thanks to @telkamp.eu and other volunteers at @radiotelescoop.bsky.social for doing the heavy lifting to make this extremely cool experiment possible!

We used the historic Dwingeloo telescope to bounce a signal off the surface of Venus, and receive its echo! This marks only the second time that amateurs have achieved an 'EVE' (Earth-Venus-Earth) bounce. Venus was about 40 million kilometers from Earth. www.camras.nl/en/blog/2025...

Deze zonsverduistering gaan we in Dwingeloo bekijken! Terwijl de radiotelescoop de afname van radiogolven van de zon volgt, kijken we buiten met een optische kijker. Er zijn eclipsbrilletjes te leen, wees welkom.

For the second time this week, the @radiotelescoop.bsky.social had a front row seat on a lunar landing attempt. This time by @intuitivemachines.bsky.social #IM-2 lunar lander. We listed to Doppler effect on the S-band signals at 2210.6MHz during its successful descent to the lunar surface.

As everyone else, we are curious about the status of @intuitivemachines.bsky.social's #IM2 Moon lander. The raw data which we recorded during our livestream is available at data.camras.nl/im2/ , we will put more data there as we extract it from the raw recordings.

Second Moon landing in a week! We will try to track the Moon landing of @intuitivemachines's landing of #IM2 #Athena with the Dwingeloo radio telescope. We will live stream our signal (the frequency of the carrier), starting around 6 March 16:45 UTC. www.youtube.com/watch?v=K0we...