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Reposted by Eelke Visser

Marco Langbroek @marcolangbroek.bsky.social · Sep 5

The secretive X-37B #Spaceplane #OTV 8 (brightest trail) passing over my house in Leiden in twilight about half an hour ago.
Second fainter trail is unidentified object in a higher orbit, unrelated to OTV 8.
Canon EOS 80D + Samyang 1.4/35 mm at F2.0, 4 sec, 800 ISO.

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Eelke Visser @eelkevisser.bsky.social · Sep 5

OTV-8 has just passed my camera. It was 2 seconds early. @marcolangbroek.bsky.social @dutchspace.bsky.social

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Reposted by Eelke Visser

Marco Langbroek @marcolangbroek.bsky.social · Sep 4

The X-37B spaceplane OTV 8 earlier this evening from Leiden, the Netherlands:

trail of OTV 8 amidst the stars (framestack of 231 frames)

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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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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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Eelke Visser @eelkevisser.bsky.social · Jun 23

There appear to be 6 ICEYEs on this launch. Do you know which one is the Dutch one? ICEYE-X52 to ICEYE-X57.

Eelke Visser @eelkevisser.bsky.social · Apr 2

Yes, I have seen it too. I picked it up at low elevation with the binoculars. Beautiful sight!

Reposted by Eelke Visser

DutchSpace @dutchspace.bsky.social · Mar 30

Update: looks like the launch-pad survived !

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Reposted by Eelke Visser

Marco Langbroek @marcolangbroek.bsky.social · Mar 26

I observed the #NROL69 payload (only one found so far), USA 498, earlier this evening, in a 64-degree inclined orbit not far from my search orbit.
Footage (from Leiden, the Netherlands)

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Eelke Visser @eelkevisser.bsky.social · Mar 26

Have just observed #NROL-69, in a 64° inclined orbit. Thanks to the seesat members for finding it! @marcolangbroek.bsky.social @tomppa77.bsky.social

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Eelke Visser @eelkevisser.bsky.social · Mar 9

That 'Possibly' makes me think about alternatives that Astron is involved with. Haven't I read somewhere that the first cell of SKA was being tested?

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Eelke Visser @eelkevisser.bsky.social · Mar 9

@cbassa.bsky.social Lofar?

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Eelke Visser @eelkevisser.bsky.social · Mar 6

That is a challenge. If you find the right ground station, the rms error will be very low. If the frequency is to low/high you need to look for a point east/west, that has the right line of sight velocity, due to Earth's rotation. Then find all ground station in that part of the world and just try.

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Eelke Visser @eelkevisser.bsky.social · Mar 6

Nice stable carrier since landing of #Athena, one and a half hour ago.

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Eelke Visser @eelkevisser.bsky.social · Mar 6

Great analysis of Scott, comparing my Doppler data to his GMAT model of the scheduled IM2 landing!

Scott Tilley @coastal8049.bsky.social · Mar 6

It appears @Int_Machines IM-2 landed on time and largely to the trajectory they planned. @eelkevisser.bsky.social @amsat-dl.org

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Eelke Visser @eelkevisser.bsky.social · Mar 6

Just observed the Moon landing of @intuitivemachines.bsky.social #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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Eelke Visser @eelkevisser.bsky.social · Mar 4

Received a nice Doppler curve of Athena #IM2 of
@intuitivemachines.bsky.social. 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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Eelke Visser @eelkevisser.bsky.social · Mar 2

Observed Athena #IM2 of
@intuitivemachines.bsky.social
again today. It was also groundlocked to India. Ignored the trajectory correction of march 1 and fitted the orbit.

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Reposted by Eelke Visser

Cees Bassa @cbassa.bsky.social · Mar 2

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 Eelke Visser

Cees Bassa @cbassa.bsky.social · Mar 2

Tracking the @firefly-aerospace.bsky.social Blue Ghost MIssion 1 #BGM1 lunar landing with @radiotelescoop.bsky.social. The effects of the descent burn are becoming visible in the Doppler data.

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Eelke Visser @eelkevisser.bsky.social · Mar 1

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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Eelke Visser @eelkevisser.bsky.social · Mar 1

Also took a look at @firefly-aerospace.bsky.social 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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Eelke Visser @eelkevisser.bsky.social · Mar 1

Observed Athena of @intuitivemachines.bsky.social 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.bsky.social forum. Thanks @coastal8049.bsky.social for the hints to the GS.

Eelke Visser @eelkevisser.bsky.social · Mar 1

Sometimes this 'Goon' feels very silly or should I say 'hilly'...

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Eelke Visser @eelkevisser.bsky.social · Feb 28

I'll look again tomorrow! Good luck hunting Odin!

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