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🚨 QUEQIAO-2 loud and clear on S-band. Using likely the same primary TT&C as QUEQIAO-1 as it's Doppler is just a bit lower at the moment while close to Earth... On the usual direct ascent approach to the Moon used by other Chinese missions so launch appears successful.

Scott Tilley 🇺🇦 🇨🇦

24,272 subscribers

12,662 Aufrufe • vor 2 Jahren •via X (Twitter)

Wissenschaft & Technologie

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5 Kommentare

Profilbild von Scott Tilley 🇺🇦

Scott Tilley 🇺🇦vor 2 Jahren

Wide spectra view of QUEQIAO-2 signal.

Profilbild von Scott Tilley 🇺🇦

Scott Tilley 🇺🇦vor 2 Jahren

At present the rest of S-band is vacant of emissions from QUEQIAO-2. QUEQIAO-1 has used a number of frequencies on S-band, but 2234.5MHz has been the primary TT&C channel. Earth bound relay downlink on 2287MHz the usually reported signal when it runs just a high power carrier.

Profilbild von Scott Tilley 🇺🇦

Scott Tilley 🇺🇦vor 2 Jahren

QUEQIAO-2 appears locked with a ground station. Most likely one of China's many in South America. The much higher slope than predicted is your first clue. Fitting the data to estimated orbit is the next clue...

Profilbild von xiaoqianWX

xiaoqianWXvor 2 Jahren

Can confirm it's the main antenna, the main antenna deployed only minutes after separation from launch vehicle.

Profilbild von Scott Tilley 🇺🇦

Scott Tilley 🇺🇦vor 2 Jahren

This is TT&C of Queqiao-2, the main antenna is unlikely to be in use presently even if deployed as the spacecraft is far to close to Earth. The SNR is too low for a 4.5m antenna at this range as well. All is consistent with usual TT&C levels of earlier Chinese missions to Moon.

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