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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 01/10/2026

Aanstaande zondag 4 oktober zijn wij onderdeel van de Open Dag van ASTRON (@astronnl.bsky.social). Met een pulsar in de telescoop, een nieuwe 2m-telescoop, waterraketten lanceren, een Morse-workshop en veel meer! Wees welkom, de open dag is van 12:00-16:00, zie www.astron.nl #weekendvandewetenschap

Aankondiging Weekend van de Wetenschap bij ASTRON. Ontdek het universum tijdens de open dag bij ASTRON, 4 oktober 12 - 16 uur, Dwingeloo. Ruim 30 activiteiten: telescoop besturen, waterraketten schieten, augmented reality spel, infrarood licht demo, zwarte gaten ontdekken, fluisterschotels proberen en nog veel meer.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 01/09/2026

Last Sunday, we observed the flaring source Cyg X-3 with VLBI between the amateur radio telescopes in Stockert and Dwingeloo. We had to observe low above the horizon (2˚) making calibration hard, but it's still quite bright - a few Jansky, as was noted in Astronomer's Telegram 18003 on 24 August.

Graph showing a strong correlation on Cygnus X-3 between Dwingeloo - Stockert, 2026-08-30, 120 seconds integration time. On an offset of 0 seconds, the correlation magnitude is 1500 (uncalibrated).

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Edda Heinsman @edda.bsky.social · 05/07/2026

Rondleiding @radiotelescoop.bsky.social Dwingeloo: aanrader!

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 14/06/2026

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.

Graph showing time on x axis (7 June to 14 June 2026), frequency on y axis (900 to 1500Hz). The data shows a jump on 11 June. Graph title: "Frequency residual w.r.t. Kamo'oalewa, base freq 8428.200 MHz)."

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 08/06/2026

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.

Sky plot showing the location where the Dwingeloo telescope measured the Tianwen-2 spacecraft, with a 0.1 degree field of view. On 7 June, the spacecraft is apparently within 0.1 degree of the asteroid.

Frequency residual w.r.t. Kamo'oalewa, with an estimated base freq of 8428.201 MHz. On 4-6 June the residual is between 13800 and 14300 Hz, increasing. From 7 June, the line is almost flat, changing only a few Hz in hours. This shows the change in line-of-sight velocity is now close to that of Kamo'oalewa.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 31/05/2026

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.

Dwingeloo observations of Tianwen-2. A star plot (DSS background) with a blue line showing the coordinates of Kamo'oalewa over time and red dots showing the Dwingeloo radio telescope localizations of the spacecraft. A fit through the localizaions shows that the spacecraft is getting closer to the asteroid.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 27/05/2026

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

websdr.camras.nl

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Daniel Estévez @destevez.net · 27/05/2026

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...

A screenshot of a GNU Radio flowgraph GUI demodulating the signal from Tianwen-2, which has rather high SNR.

A raster map of one of the decoded Space Packet APIDs. We can see a few fields changing values, but most of the contents are fairly static.

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Aang23 @aang23.satdump.org · 26/05/2026

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

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 25/05/2026

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....

Screenshot showing spectra of Tianwen-2, amongst others in SatDump. In SatDup, the Tianwen-1 decoder was used. It shows a clean constellation and a synced Viterbi decoder, but the deframer says 'NOSYNC'

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 17/04/2026

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.

Left: a black-and-white photo from 17 april 1956 with telescope, Queen Juliana and Professor Oort. Right: color photo from 17 april 2026 with the same setting.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 10/04/2026

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.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 06/04/2026

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!

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 02/04/2026

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.

Graph with time on x axis, frequency on y axis. A distinct change in frequency is seen around 03:25 UTC, indicating a burn.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 02/04/2026

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.

Chart with horizontal time, vertical doppler shift. Wobbles show when the spacecraft manoevers.

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AMSAT-DL @amsat-dl.org · 31/03/2026

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)

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 09/03/2026

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

Fireball, with the Dwingeloo radio telescope on the foreground

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Corey S. Powell @coreyspowell.bsky.social · 20/02/2026

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

Mosaic of deep-space images from the LOw Frequency ARray (LOFAR) Two-metre Sky Survey.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 12/01/2026

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

camras.nl

Radiotelescoop Dwingeloo | CAMRAS – Radiotelescoop Dwingeloo | PI9RD

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 10/01/2026

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

Graph titled "Dwingeloo Radio telescope detection of FRB 20251229A". Horizontal time (1 seconds total), vertical observing frequency 1300-1400MHz. A faint vertical line is visible around 210.1 seconds.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 14/11/2025

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...

rtvdrenthe.nl

Bijzonder moment voor Radiotelescoop Dwingeloo: 'Tweehonderd mensen luisteren naar het ritme van het restant van een ontplofte ster'

De historische radiotelescoop speelt vandaag een bijzondere rol in een internationaal muziekproject.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 17/10/2025

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

Nachtfoto van de radiotelescoop, met op de voorgrond iemand die door een optische sterrenkijker naar het sterrenbeeld Orion kijkt, dat tussen de wolken door te zien is.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 14/10/2025

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...

Titelbeeld van RTV Drenthe's Gefluister uit het duister, met op de achtergrond een beeld van de radiotelescoop Dwingeloo

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 29/09/2025

Knap mistig in Dwingeloo! Foto: Arno Schoenmakers.

Radiotelescoop Dwingeloo in de mist, met een zon die door de mist heen schijnt.

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AMSAT-DL @amsat-dl.org · 20/09/2025

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.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 13/09/2025

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

Een zaal met tafels met elektronica. Op de voorgrond een metalen constructie met een hoornantenne, die vroeger in de Dwingeloo telescoop zat.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 05/07/2025

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

Ontdek de zon tijdens de landelijke zonnekijkdag, 6 juli 2025

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AMSAT-DL @amsat-dl.org · 05/06/2025

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

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 05/06/2025

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!

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 05/06/2025

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

youtube.com

Livestream CAMRAS Radiotelescoop

YouTube video by CAMRAS Radiotelescoop

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 25/05/2025

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.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 16/05/2025

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

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Thomas Telkamp @telkamp.eu · 15/05/2025

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!

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Daniel Estévez @destevez.net · 25/04/2025

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!

A plot with the same title as before: Frequency difference between Bochum and Dwingeloo (with Doppler for Mare Crisium subtracted). The curve is now different. It is a noisy ramp that increases from -1.75 Hz to 0.75 Hz.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 22/04/2025

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

Drone-foto van de Radiotelescoop Dwingeloo

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Daniel Estévez @destevez.net · 20/04/2025

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...

A plot of the power spectral density of the signal as received in Stockert and Dwingeloo. The plot is normalized so that the noise has mean zero and standard deviation one, so the detection values in sigmas can be read directly. There is a continuous trace showing the measurement of the PFB spectrum analyzer with 0.5 Hz bins, and a dashed trace that is a moving average of 5 of these bins.

A plot of the power spectral density of the maximum ratio combining of the signals at Stockert and Dwingeloo. The Doppler spread model is also shown for comparison. The model predicts a slightly larger Doppler spread than what observed in practice. As in the previous plot, the spectrum is normalize so that noise has mean zero and standard deviation one, and both the spectrum in 0.5 Hz bins and a moving average of 5 bins are shown.

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Daniel Estévez @destevez.net · 20/04/2025

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. 🧵

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Cees Bassa @cbassa.bsky.social · 10/04/2025

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.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 01/04/2025

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.

Graph showing an Earth-Venus-Earth detection in one transmission transmitted with the Dwingeloo Telescope, received with the Stockert Telescope.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 01/04/2025

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...

websdr.camras.nl

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 29/03/2025

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

Foto van een opblaaszon met een hap eruit, en de hond die die hap genomen heeft.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 29/03/2025

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.

Grafiek waarin te zien is hoe de radioruis van de zon afneemt tijdens een gedeeltelijke zonsverduistering.

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Cees Bassa @cbassa.bsky.social · 24/03/2025

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!

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 24/03/2025

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...

Graphs showing EVE detections: 5.4 sigma for Dwingeloo-Dwingeloo, 8.5 sigma for Dwingeloo-Stockert, 9.2 sigma for combined Dwingeloo/Stockert

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 22/03/2025

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.

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