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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · 01/01/2026

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.

The image shows the hourglass shape of the length of the day and night over the 365 days in 2025. Diagonal bands indicate when the Moon was up in the night sky.

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Thomas Telkamp @telkamp.eu · 29/11/2025

We hadden het er net vandaag over (Dwingeloo)...

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Thomas Telkamp @telkamp.eu · 05/10/2025

In the graph on the laptop screen you see a small peak, this is the carrier transmitted by Voyager 1, that took more than 23 hours to reach us.

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Thomas Telkamp @telkamp.eu · 05/10/2025

Receiving Voyager 1 just two weeks ago at Sternwarte Bochum and @amsat-dl.org!

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Thomas Telkamp @telkamp.eu · 26/09/2025

As shown by @coastal8049.bsky.social, nice rotational Doppler on IMAP.

Frequency of IMAP signal as received in De Bilt.

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Thomas Telkamp @telkamp.eu · 21/09/2025

It was a great day! We tracked Voyager-1 Doppler for more than 4 hours. During that time, it stayed well within 1 Hz of predicted values from the published trajectory.

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Reposted by Thomas Telkamp

AMSAT-DL @amsat-dl.org · 05/06/2025

We lost HAKUTO-R M2 signal suddenly

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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

Thomas Telkamp @telkamp.eu · 25/05/2025

Measuring Radio Recombination Lines (RRL) with the Dwingeloo telescope (@radiotelescoop.bsky.social), in the Omega Nebula (M17/W38).

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Thomas Telkamp @telkamp.eu · 25/05/2025

At even higher excitation levels (n=252) we can measure the radio emission in the UHF band (408 MHz).

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Thomas Telkamp @telkamp.eu · 25/05/2025

These lines are weak and take a long integration time (30 minutes+) to become visible. For comparison, this is the H167⍺ RRL at M17 at the same scale as the neutral Hydrogen (HI) profile at M17.

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Thomas Telkamp @telkamp.eu · 25/05/2025

They are essentially the radio counterparts of the Balmer series of lines (n=2), which are visible light lines. In L-band we can detect 4 of these lines, from different energy levels.

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Thomas Telkamp @telkamp.eu · 25/05/2025

These are spectral lines in the radio spectrum that arise from the transitions of electrons between high energy levels in atoms (n>90), when electrons recombine with ions in ionized gas regions, like HII regions.

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Thomas Telkamp @telkamp.eu · 25/05/2025

Measuring Radio Recombination Lines (RRL) with the Dwingeloo telescope (@radiotelescoop.bsky.social), in the Omega Nebula (M17/W38).

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Thomas Telkamp @telkamp.eu · 18/05/2025

And the carrier still being received by the historic @radiotelescoop.bsky.social last week Wednesday!

Voyager carrier as received in Dwingeloo.

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Reposted by Thomas Telkamp

Chris Hadfield @cmdr-hadfield.bsky.social · 17/05/2025

Imagine starting a car that hadn't run in 21 years, that's 15 billion miles away in interstellar space. That's what the NASA team just did with Voyager's thrusters. People are amazing. jpl.nasa.gov/news/nasas-v...

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Thomas Telkamp @telkamp.eu · 18/05/2025

So impressive. And we can still receive the Voyager 1 carrier with the historic 25 meter dish in Dwingeloo @radiotelescoop.bsky.social, as we demonstrated last week Wednesday.

Voyager 1 carrier as received in Dwingeloo.

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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 02/04/2025

Just catching up on this excellent #RadioAstronomy work by ProAm group using the Dwingeloo Telescope. 🔭📡 They managed to fire a signal at Venus, and catch the reflection back on two antennas here on Earth! There is *lots* of nice working coming from this group! 👏👏👏 Blog + link to script below

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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

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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Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · 06/03/2025

Zooming in on the final minutes of the descent burn, we can see the braking burn transitioning into a hover around 17:28UTC and then a slower descent. At 17:28:45UTC there's a jump in frequency and then a slower leveling off to the Doppler frequency of the Moon. Congratulations on the landing!

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Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · 06/03/2025

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.

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Thomas Telkamp @telkamp.eu · 05/03/2025

Yesterday bouncing Zadoff-Chu sequences off the moon!

Delay-Doppler plot of Zadoff-Church sequence bounced off the moon.

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Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · 02/03/2025

With the #BGM-1 lander from @firefly-aerospace.bsky.social now safely on the surface of the Moon, we've had some time to take a closer look at the @radiotelescoop.bsky.social's observation of the #BGM-1 signal during the landing, which shows several events during the landing sequence.

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Reposted by Thomas Telkamp

Cees Bassa @cbassa.bsky.social · 02/03/2025

With @radiotelescoop.bsky.social we've observed the failed landings of Beresheet and Chandrayaan-2 in 2019 and the partially successful landings of SLIM and IM-1 last year. This is the first landing that appears to have gone by the book. Thanks to Tammo Jan Dijkema and @telkamp.eu for helping today.

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Reposted by Thomas Telkamp

Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · 01/02/2025

The Spanish cubesat Uresat has finally deployed its antennas. Until it had, we were almost the only station that could receive it. We confirm that after antenna deployment, the signal is much stronger. Here's an FM snippet from yesterday's @satnogs.bsky.social pass: "EA1YO greeting from AO4URE".

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Thomas Telkamp @telkamp.eu · 18/01/2025

Same data, but now with a predicted Doppler profile based on the (outdated?) TLE and an uplink lock on the ESA Santa Maria ground station in the Azores. Matches quite well.

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Thomas Telkamp @telkamp.eu · 17/01/2025

Hakuto-R M2 Doppler measured over 7 hours last night from NL.

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Thomas Telkamp @telkamp.eu · 04/01/2025

Note that the galactic latitude and longitude in Fig. 3 above is using the 'old' galactic coordinates system, with Sagittarius A (the center of the Milky Way) at 327 deg. lon. This got updated in 1958, and in the NASA picture you see Sgr. A at 0 degrees. Ref: ui.adsabs.harvard.edu/abs/1960MNRA...

ui.adsabs.harvard.edu

The new I. A. U. system of galactic coordinates (1958 revision)

The definition of a new system of galactic coordinates was recently announced by Sub-Commission 33b on behalf of the I.A.U. The present paper is the first of a series of five, which together form the ...

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Thomas Telkamp @telkamp.eu · 04/01/2025

We used the Dwingeloo Radio Telescope to repeat its discovery of the 3 kpc Arm of the Milky Way in 1957. And we can confirm it's still there! Yesterday's measurements (red +) overlayed on the graph from the original paper.

3 kph Arm graph from 1957 paper, with new measurements overlayed.

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Thomas Telkamp @telkamp.eu · 30/12/2024

Juno (Jupiter, 623 million km) on a 1.5m dish, incl. Doppler tracking:

Juno Doppler tracking comparison to Horizons.

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Thomas Telkamp @telkamp.eu · 20/12/2024

The frequency axis shows the offset from our tuned center frequency, which is in the 8.4 GHz band. The power is uncalibrated, and only shows the difference between the signal and the averaged noise (in 1 Hz bandwidth).

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Thomas Telkamp @telkamp.eu · 20/12/2024

Unfortunately not, you need a much bigger dish (e.g. 70 meters) to be able to demodulate the data in the signal. We just see the carrier of the signal (which contains 25% of the power transmitted by the spacecraft).

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Thomas Telkamp @telkamp.eu · 11/12/2024

Nice setup! Of course Voyager 1 was still just around the corner back then, with 4.5 dB more signal :-)

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Thomas Telkamp @telkamp.eu · 10/12/2024

Yes! We received Voyager 1 on the Dwingeloo telescope! Not bad for a telescope from 1956 and spacecraft from 1977 📡🛰️ More at www.camras.nl/en/blog/2024...

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