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Reposted by Cees Bassa

Dr Laura Driessen @astrolaura.com · Sep 7

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

Dr Laura Driessen @astrolaura.com · Sep 5

Lunar eclipse fans, there's a total lunar eclipse this weekend! All of Australia (and a bunch of other countries) will be able to see all the best bits. The eclipse will be in the evening of Sunday the 7th or the morning of Monday the 8th of September 🧪🔭🌝
www.abc.net.au/news/science...

When and where can I see Monday's total lunar eclipse from Australia?

A total lunar eclipse, also known as a "blood moon", will be visible across all of Australia next week. Here's what you need to know to get the best view and snap the best photo.

www.abc.net.au

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AMSAT-DL @amsat-dl.org · Sep 6

💥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 ⬇️

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Eelke Visser @eelkevisser.bsky.social · Sep 4

Last night the Spaceplane X-37B, OTV-8 was observed. It appeared super bright. @marcolangbroek.bsky.social @dutchspace.bsky.social

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Aang23 @aang23.satdump.org · Aug 19

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.

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Eelke Visser @eelkevisser.bsky.social · Jun 29

Last night, several satellites of the Transporter 14 launch were optically observed. For more information see the @satnogs.bsky.social forum:
community.libre.space/t/transporte...

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Dr. Kelley Hess @khesser.bsky.social · Jun 16

#skao2025 Federico Di Vruno on impact of satellites on #RadioAstronomy from intended emissions (strong enough to saturate receivers) & unintended electromagnetic radiation (originating from on satellite electronics). In future 🛰️ constellations could impact 25% of our observing time! 🔭📡🧪

Slide modelling the orbits of satellites and how often they enter a telescope’s field of view.

Slide 2 about modelling the orbits of satellites and how often they enter a telescope’s field of view.

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Michele Bannister @astrokiwi.bsky.social · Jun 10

New paper day! In 'Near-future rocket launches could slow ozone recovery', we show that scaling up use of launch vehicles 🚀 has a point where the healing of the ozone layer is affected 🧪🛰️
Open access, free to read & share

Near-future rocket launches could slow ozone recovery

npj Climate and Atmospheric Science - Near-future rocket launches could slow ozone recovery

rdcu.be

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Cees Bassa @cbassa.bsky.social · Jun 7

Glad to hear you found the software useful!

Reposted by Cees Bassa

adrelys.com @adrelys.com · Jun 7

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!

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Mark Panning @markpanning.seismology.space · Jun 5

Unfortunately the surface of the Moon is also quite hard.

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AMSAT-DL @amsat-dl.org · Jun 5

We lost HAKUTO-R M2 signal suddenly

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Jun 5

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 · Jun 5

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

Livestream CAMRAS Radiotelescoop

YouTube video by CAMRAS Radiotelescoop

www.youtube.com

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Cees Bassa @cbassa.bsky.social · Jun 4

It looks like not just Satdump was used as the software for this project! I recognize the spectrogram plots. I hope STRF has been useful as well.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · May 16

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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Paula Surridge @psurridge.bsky.social · May 9

And Magritte fans 😀

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Cees Bassa @cbassa.bsky.social · May 9

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

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Jonathan McDowell @planet4589.bsky.social · Apr 30

Maybe the upper stage failure ended up tumbling the spacecraft fast enough to break it up?

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Jonathan McDowell @planet4589.bsky.social · Apr 30

Following up on @marcolangbroek.bsky.social 's post on the upcoming Venera capsule reentry, I've done a writeup describing my own analysis of this object, which I first got interested in a quarter century ago!
planet4589.org/space/debris...

Probe No. 670 was boosted to solar orbit and named Venera-8 ("Venus-8"). It was launched on 1972 Mar 27 and successfully landed on Venus on 1972 Jul 22, surviving for 50 minutes on the surface.

planet4589.org

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Cees Bassa @cbassa.bsky.social · Apr 30

Thanks for the write up. One thing I've not seen discussed is why the descent stage would've separated in Earth orbit. I assume the whole probe would've needed a cruise stage for the trip to Venus of which it would have to separate. Have you come across any information that might explain that?

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Ingrid Stairs @ingridhstairs.bsky.social · Apr 29

Time for some science again... We are finding new pulsars with CHIME by stacking data over multiple days to boost sensitivity. As always, a huge effort by multiple postdocs, students and programmers.

arxiv.org/abs/2504.16293

CHIME All-sky Multiday Pulsar Stacking Search (CHAMPSS): System Overview and First Discoveries

We describe the CHIME All-sky Multiday Pulsar Stacking Search (CHAMPSS) project. This novel radio pulsar survey revisits the full Northern Sky daily, offering unprecedented opportunity to detect highl...

arxiv.org

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Daniel Estévez @destevez.net · Apr 25

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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tammo80.bsky.social @tammo80.bsky.social · Apr 20

Great work! This is why we put our IQ on the web :)
One remark on why Dwingeloo is less sensitive: we have a relay in front of the first LNA, because Dwingeloo also transmits in experiments like this one. Apart from that, we may also need a better LNA.

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Cees Bassa @cbassa.bsky.social · Apr 20

My solution for this has been to use SPKCPO to get the state vector of the center of Venus, and then use SXFORM and MXVG to convert surface positions on Venus to offset positions and velocities in the observer frame. This works but the delay/doppler needs to be computed separately for each position.

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Cees Bassa @cbassa.bsky.social · Apr 20

And thanks for the discussion of the SPICE functions you used. This is something I struggled with as well as it appears there is no SPICE function that'll compute the state vector between a surface position on a target body and a surface position on an observing body.

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