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Remember that the hold-downs do not have to handle the full thrust of the engines. They have to handle amount by which the thrust exceeds the weight of the object on the launch mount. The highest of those loads would be a Booster without a Ship, IF they static-fire all engines at full thrust. I doubt they would fire the Booster without a full load of propellant.

They also need to handle keeping the thing upright in the wind and that load is highest with both stages stacked.
SLS will be freestanding without holdown of any type for days prior to launch. I realize the Space X stack is taller, but its support base is also wider in certain vectors than SLS resting solely on its SRBs.  the SRB mass is always there unlike the SS/Booster prop. mass delta loaded vs. inert.
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Space Science Coverage / Re: Astronomy & Planetary Science Thread
« Last post by Star One on Today at 04:48 pm »
The discovery of the 528.6 Hz accreting millisecond X-ray pulsar MAXI J1816-195

We present the discovery of 528.6 Hz pulsations in the new X-ray transient MAXI J1816-195. Using NICER, we observed the first recorded transient outburst from the neutron star low-mass X-ray binary MAXI J1816-195 over a period of 28 days. From a timing analysis of the 528.6 Hz pulsations, we find that the binary system is well described as a circular orbit with an orbital period of 4.8 hours and a projected semi-major axis of 0.26 light-seconds for the pulsar, which constrains the mass of the donor star to 0.10−0.55M⊙. Additionally, we observed 15 thermonuclear X-ray bursts showing a gradual evolution in morphology over time, and a recurrence time as short as 1.4 hours. We did not detect evidence for photospheric radius expansion, placing an upper limit on the source distance of 8.6 kpc.

https://arxiv.org/abs/2208.04721
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Indian Launchers / Re: GSLV Mk III - Chandrayaan-3 - Q1 2023
« Last post by vyoma on Today at 04:46 pm »
https://www.financialexpress.com/defence/isro-likely-to-launch-chandrayaan-3-and-aditya-l1-mission/2635422/ [18 Aug 2022]

Quote
Somanath S, Secretary DOS / Chairman ISRO, in an exclusive interaction told Financial Express Online said “We are targeting to accomplish the mission in the beginning of 2023. The Chandrayaan-3 mission is under development. It is going through a phase with many critical tests to ensure design ruggedness.”

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This seems caught up somewhere between 'don't bet against Elon' and it'll happen, just on 'Elon time'.

My prediction is either it happens, just with a 90% of losing starship on re-entry, or they switch to a F9/FH.
I presume you mean 90% chance of losing the Starship during its first dozen launches or so.  They will lose a few while they work out the kinks in EDL, but after that?  They lost a few F9s while learning how to return them, but now they've recovered the F9 booster from 62 launches in a row, and over a hundred times in all.  I see no reason to believe it will be otherwise with Starship.
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Missions To The Moon (HSF) / Re: Artemis 1 Discussion Thread
« Last post by haywoodfloyd on Today at 04:41 pm »
I read somewhere that the Orion capsule won't have a working life support system for this mission.
Is this true?
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Chinese launch schedule
August 20 - CZ-2D (Y80) - XSLC, LC3
                    Yaogan-35 Group 04

What is the source for Y80 ?
Typically Mikezang though the post seems to have been pulled or is in another thread and didn't get pulled out. Other times private messages can be the result.
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https://www.financialexpress.com/defence/isro-likely-to-launch-chandrayaan-3-and-aditya-l1-mission/2635422/ [18 Aug 2022]

Looks like ISRO is still waiting for VELC payload from IIAP:

Quote
Giving an update on the launch of Aditya L1 mission, Somanath S, Chairman ISRO said, “The spacecraft is currently being integrated. A critical payload is undergoing testing and integration. Full spacecraft is yet to be assembled and tested. The present schedule for launch is the beginning of 2023.”
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L-1 weather forecast.  50% 'Go' for August 19.  70% 'Go' for August 20.  All Additional Risk Criteria are Low.

Note: Yesterday's L-2 weather forecast was not posted publicly.
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Chinese launch schedule
August 20 - CZ-2D (Y80) - XSLC, LC3
                    Yaogan-35 Group 04

What is the source for Y80 ?
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Why did NASA decide to conduct the rollout for the SLS rocket for the Artemis 1 mission a bit sooner than initially planned?

Per the NSF stream, NASA rolled out SLS early for launch weather reasons. Also to give workers another 24 hours for prelaunch preps.
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