Doesn't Russia threaten this like every year?
Quote from: bstrong on 04/20/2021 01:30 amQuote from: sdsds on 04/20/2021 01:16 am...And the Service Module (Zvezda) is where the presumed leak is located? So how many wires would need to be manually cut to jettison Zvezda and everything aft of there from the US segment?It just doesn't seem realistic to me that NASA could operate Zarya without Russian support and parts, even if they do own it. If they're going to let Russia walk away, they should ditch Zarya, too, and completely end the Russian dependency, IMO.Currently Zarya is needed to desaturate the USOS gyroscopes (CMGs), right? And of course it can handle attitude control if the CMG system is unavailable. Is it needed for anything else?
Quote from: sdsds on 04/20/2021 01:16 am...And the Service Module (Zvezda) is where the presumed leak is located? So how many wires would need to be manually cut to jettison Zvezda and everything aft of there from the US segment?It just doesn't seem realistic to me that NASA could operate Zarya without Russian support and parts, even if they do own it. If they're going to let Russia walk away, they should ditch Zarya, too, and completely end the Russian dependency, IMO.
...And the Service Module (Zvezda) is where the presumed leak is located? So how many wires would need to be manually cut to jettison Zvezda and everything aft of there from the US segment?
Russia says to launch own space station in 2025QuoteRussia's space agency said Tuesday it hoped to launch its own orbital station in 2025 as Moscow considers withdrawing from the International Space Station programme to go it alone.Roscosmos chief Dmitry Rogozin said work had begun on the fist module of a new station, after officials warned that Russia was considering pulling out of the ISS, one of the few successful examples of cooperation with the West.https://twitter.com/mattb0401/status/1384533094452109321QuoteStill no official announcement of Russian withdrawal from ISS in 2025, but here’s the Roscosmos chief teasing construction of a module to be used as the core of a new Russian station in 2025. This module actually was commissioned for ISS in 2024.Rogozin later explained that Russia isn’t talking about de-orbiting its ISS modules in 2025, but rather a gradual withdrawal from the project over time.But still no official anything, even though all signs indicate Russia really is tapping out.Maybe they’re saving the official announcement for Putin’s big speech tomorrow. If I was the writer of this timeline thats how I’d do it.
Russia's space agency said Tuesday it hoped to launch its own orbital station in 2025 as Moscow considers withdrawing from the International Space Station programme to go it alone.Roscosmos chief Dmitry Rogozin said work had begun on the fist module of a new station, after officials warned that Russia was considering pulling out of the ISS, one of the few successful examples of cooperation with the West.
Still no official announcement of Russian withdrawal from ISS in 2025, but here’s the Roscosmos chief teasing construction of a module to be used as the core of a new Russian station in 2025. This module actually was commissioned for ISS in 2024.Rogozin later explained that Russia isn’t talking about de-orbiting its ISS modules in 2025, but rather a gradual withdrawal from the project over time.But still no official anything, even though all signs indicate Russia really is tapping out.Maybe they’re saving the official announcement for Putin’s big speech tomorrow. If I was the writer of this timeline thats how I’d do it.
Zarya’s thrusters have been inactive since 2000.
Quote from: Danderman on 04/21/2021 03:47 amZarya’s thrusters have been inactive since 2000.But ... isn't control/coordination of thrust from other Russian modules and docked vehicles handled by Zarya?
Quote from: sdsds on 04/21/2021 04:10 amQuote from: Danderman on 04/21/2021 03:47 amZarya’s thrusters have been inactive since 2000.But ... isn't control/coordination of thrust from other Russian modules and docked vehicles handled by Zarya?I thought Zvezda took care of that.
I'm a bit confused by "since 2025" in the quote. Does that mean Russian involvement in the ISS ends (if this happens) in 2024 or in 2025?Quote from: russianhalo117 on 04/19/2021 08:23 pmThe final inclination selected for CSS prevents Russian involvement without taking prohibitive mass penalties.Wait, really?
The final inclination selected for CSS prevents Russian involvement without taking prohibitive mass penalties.
Quote from: soyuzu on 04/20/2021 07:12 amQuote from: strkiky on 04/20/2021 07:10 amQuote from: russianhalo117 on 04/19/2021 08:23 pmThe final inclination selected for CSS prevents Russian involvement without taking prohibitive mass penalties.Wait, really?I'm a bit curious on this statement as well, could someone clarify this.CSS uses a 42 deg inclination orbit, lower than the latitude of any Russian/Pre-USSR cosmodromes.Why is that prohibitive? 10-20 degree inclination changes happen all the time.
Quote from: strkiky on 04/20/2021 07:10 amQuote from: russianhalo117 on 04/19/2021 08:23 pmThe final inclination selected for CSS prevents Russian involvement without taking prohibitive mass penalties.Wait, really?I'm a bit curious on this statement as well, could someone clarify this.CSS uses a 42 deg inclination orbit, lower than the latitude of any Russian/Pre-USSR cosmodromes.
Quote from: russianhalo117 on 04/19/2021 08:23 pmThe final inclination selected for CSS prevents Russian involvement without taking prohibitive mass penalties.Wait, really?I'm a bit curious on this statement as well, could someone clarify this.
Zvezda is the C&C center of the ISS, akin to Mir's base block - and by extension of the RS. Most propellant storage is also located there, around the circumference of the transfer chamber that's been the infamous subject of the latest leak episodes.
With Zvezda undocked a temporary attached vehicle, such as a Progress, will be required for orbital maintenance. That is until a permanent orbital maintenance vehicle can be attached to Zarya. Possibly a PPE derivative.
Removal of Zvezda from ISS is only possible when done via a docked Progress vehicle. It also requires restoring the docking system - on the Zvezda-to-Zarya docking interface - to full operational status.With Zvezda undocked a temporary attached vehicle, such as a Progress, will be required for orbital maintenance. That is until a permanent orbital maintenance vehicle can be attached to Zarya. Possibly a PPE derivative.
This is basically an April 12 announcement. Once made, and then forgotten.
A slightly more pragmatic approach from Rogozin perhaps?
The Chinese space station (launching very soon) won't be reachable from either Baikonur nor Vostochny...
Quote from: Danderman on 04/21/2021 03:50 amThis is basically an April 12 announcement. Once made, and then forgotten.Sorry - does April 12 have special significance in Russia?
Not meaning to be contrarian, but could the propulsion needed for the separation be provided from the other end of the station, e.g. by a Dragon docked at Node 2 forward? This would use the same thrusters Dragon uses to undock itself, except with its hard-dock latches still firmly engaged so the whole USOS moved with it, away from the now unattached Zvezda.Is that theoretically unfeasible, or merely ... implausible?
April 12 is Cosmonautics Day, the anniversary of Gagarin's flight. There's a tradition of grand space announcements then.
There has never been discussion of undocking Zvezda as first it and it's docked modules acts as a counterweight... (Snip)