Eelke Visser
@eelkevisser
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Real-time machine motion control software engineer. Loves science, electronics, RF and space stuff.
The Netherlands
Joined November 2017
Last night, several satellites of the Transporter 14 launch were optically observed. For more information see the @SatNOGS forum:
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Have just observed #NROL-69, in a 64° inclined orbit. Thanks to the seesat members for finding it!
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RT @coastal8049: I need to get in contact with someone in control of a large 137MHz antenna or array. Anyone got a contact?.
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RT @Ramanean: The crater walls seen in the IM2 image are marked in Red color and yellow box is where IM2 might have landed(My initial predi….
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Great analysis of Scott, comparing my Doppler data to his GMAT model of the scheduled IM2 landing!.
It appears @Int_Machines landed on time and largely to the trajectory they planned. @eelkevisser @amsatdl
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Just observed the Moon landing of @Int_Machines #Athena #IM2 with the Discovery Dish pointed at the moon! The Doppler shows a hard kink then gets weak, and suddenly settles to a Moon speed Doppler! 😃
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Received a nice Doppler curve of Athena #IM2 of.@Int_Machines. I matched a Astropy/Poliastro model to it, showing an altitude of 105km. The complete orbit is visible and it is currently not hiding behind the moon. It appears to be flying circles around the moon seen from Earth.
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Observed Athena #IM2 of @Int_Machines again today. It was also groundlocked to India. Ignored the trajectory correction of march 1 and fitted the orbit.
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RT @Firefly_Space: We have confirmation #BlueGhost stuck the landing! Firefly just became the first commercial company in history to achiev….
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Also another circular fit on the last 4 days gives a reasonable result. Not perfect, but i am happy with this first try! 🤓
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Also took a look at @Firefly_Space Blue Ghost with the Discovery Dish. It will land on the Moon tomorrow! The Doppler was fitted nicely on my Astropy/Poliastro model. Maybe not as accurate as GMAT, but it fits automatically! 😃
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Observed Athena of @Int_Machines on its way to the Moon. Got Doppler data on two days, and it matches nice on a fitted TLE, which was found at the @SatNOGS forum. Thanks @coastal8049 for the hints to the GS.
Before and after the Satdump look, I recorded the Doppler with STRF. I haven't worked on the orbit and the Ground Station I'd yet. It deviates from a predicted curve. I repositioned the Dish to get more signal in the second half of the second picture.
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Before and after the Satdump look, I recorded the Doppler with STRF. I haven't worked on the orbit and the Ground Station I'd yet. It deviates from a predicted curve. I repositioned the Dish to get more signal in the second half of the second picture.
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Trying to see the signal of @Int_Machines IM2, with the Discovery Dish and @aang254 Satdump. @amsatdl and @radiotelescoop posted nice confirmations on Bluesky, just when I needed it! See the little 2 dB spike on the left of the big DC-spike.
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Observed @Firefly_Space Blue Ghost again and got a full orbit of Doppler data. It looks like it is not hiding behind the moon anymore.
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The orbit is shown in Red as seen from the approximate position of Earth. During part of the pass Blue Ghost will hide behind the Moon and it can not be received. This matches my measurement! 🛑
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Comparison of the GMAT model to the measured curve shows a good match. I used a 100x150 km Moon orbit, and tuned the Epoch and RAAN to match.
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