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Russia Launches ISS Module

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Russia Launches ISS Module

Old 25th Jul 2021, 09:58
  #21 (permalink)  
 
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Originally Posted by DuncanDoenitz View Post
In general, I thought that objects intended to rendezvous with the ISS would appear to approach from in-advance, rather than from the rear. In order to "pursue" the ISS, it would have to first achieve ISS-orbital-velocity plus overtake-velocity, which will clearly consume more energy. By initially positioning itself in front of the ISS, it only as to achieve orbital velocity as the ISS catches up to it. Similarly, on undocking, it will appear to lag the ISS's orbit.

Obviously, I'm not the proverbial scientist .....
Not sure if there's a ISS traditional way of doing this but the general answer is that it depends because there are various ways of doing this... putting the active vehicle into a lower orbit and approaching the passive vehicle from below/behind is one popular option but putting the active vehicle in a higher orbit than the target and then when appropriate descending from that to approaching the target from above is another

The permutations are almost endless.

i should add that what we're seeing here in the way of maneuvering is a bit atypical- Normal resupply missions/re-crewing missions to the ISS don't usually hang around in orbit for 8 days prior to docking...I haven't followed this in great detail but it looks like Nauka was put in an orbit that allows the Russians to road test it, so to speak, for few days before committing to going anywhere near ISS.




Last edited by wiggy; 25th Jul 2021 at 12:11. Reason: Tidying iPhone induced errors
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Old 25th Jul 2021, 21:35
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Due over UK about 2245z tonight. Bit cloudy though so slim chance.


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Old 25th Jul 2021, 21:53
  #23 (permalink)  
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Cloudy here too, I'm going to turn in...
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Old 26th Jul 2021, 01:30
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Well I got a good sighting of the ISS but nothing before or after.
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Old 26th Jul 2021, 06:40
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FWIW according to several sources, including the space flight forum mentioned upthread, the two vehicles are now almost literally half the globe apart.

Fingers crossed we get clearer skies where I am tonight, in Europe, and in anticipation I just checked the “heavens-above” predictions.

It is calculating that there’s more than 20 minutes between the transit times of the two objects. Given that both Nuaka and the ISS are in orbits with periods of or slightly greater than 90 minutes that would tend to confirm the magnitude of the separation.

Last edited by wiggy; 26th Jul 2021 at 08:08.
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Old 26th Jul 2021, 08:25
  #26 (permalink)  
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https://forum.nasaspaceflight.com/in...627#msg2267627

Looking at the TLE's and Jonathan's image, I think we have a few days of coasting:…..

Nauka should be gaining 15.661-15.488 = ~0.173 of a revolution a day; if I'm reading the image correctly, it's is a little more than half an orbit behind, so at this rate it will catch up in somewhere around 3 days. Somewhat consistent with the next maneuver being on July 27th…..
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Old 26th Jul 2021, 09:05
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That analysis from that forum makes sense to me, hopefully the major systems checks are done, it’s now a long game of catch up..
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Old 26th Jul 2021, 21:14
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Hurrah…a good old fashioned non virtual real “spot” at last…..

Nauka just went past shortly before 2300 local, on the schedule and on the predicted track that the heavens-above website had calculated, about 35 minutes after the ISS….(yep, pretty much half a world behind the ISS…)

Pretty cruddy skies (southern France) with cirrus around and some light pollution to the north so it wasn’t the easiest spot, even with binoculars.

As you’d expect because of relative size it’s nowhere near as bright as the ISS, from where I was it tracked through the constellation of Cassiopeia and was about the same brightness as the top left star of the “W”, epsilon Cassiopeia, which gave it a apparent magnitude on this transit of about +3….middlingly bright, nowhere as obvious as the ISS usually is.

Last edited by wiggy; 26th Jul 2021 at 21:56.
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Old 27th Jul 2021, 01:28
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Progress MS-16 (With Pirs module attached) were de-orbited the other day, and Canadarm-2 used to inspect Zvezda docking port for Nauka arrival on Thursday.



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Old 28th Jul 2021, 19:08
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This evening Nauka will only 7 minutes or in trail of the ISS (cloudy again here so won’t see it), so catching up fast.

Docking planned for tomorrow afternoon, around 1324 UTC.
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Old 29th Jul 2021, 17:07
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To follow on with the thread..

After much tweaking and adjustments, the module has successfully docked to the ISS, using automated control (the English commentator mistakenly saying the final few moments were manually controlled).

I suspect the sigh of relief and exhales of air was global, many instruments and experiments relying on the success of this mission, a very long time in the making.

Twas better viewed on the Internetz than with binoculars.

Next I think it is off to the moon with Luna-25. Subject of another thread on humanity reaching past the skies, to go boldly where they have not gone before.
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Old 29th Jul 2021, 17:43
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Twas better viewed on the Internetz than with binoculars.
Darned yoof of today..”everything’s better on TV”

I think I might have struggled to see today’s event through bins though and I do agree the TV footage was indeed mighty spectacular….
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Old 29th Jul 2021, 20:16
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It's all hands on deck this evening. Uncommanded thruster activity from Nauka (apparently propellant now exhausted) crew ordered to close hatch and shutter windows, and station temporarily placed into free drift. Starliner launch may be delayed.
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Old 29th Jul 2021, 20:58
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Bloody hell! That sounds dodgy.
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Old 29th Jul 2021, 22:08
  #35 (permalink)  
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I refer you to post #16, reference leaky seals.

Root cause or something different*? If so, it would seem someone took a chance. I imagine questions will be being asked….

Russia Launches ISS Module

* https://arstechnica.com/science/2021...space-station/

Last edited by ORAC; 30th Jul 2021 at 08:08.
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Old 30th Jul 2021, 15:46
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Story of what went on last night, seems to be, as I understand it, open to correction etc.

Immediately on docking Nauka’s attitude control system was meant to have been in effect disabled TFN. Initially that seemed to have happened.

Well after docking, for some reason (software fault onboard/on ground?) Nauka’s attitude control system became active again and there then began an attitude tug of war as Nauka decided it wanted to point in a certain direction and the ISS, not wanting to budge, fought back using the attitude control system on one of the other docked vehicles.

Battle finally ended when Nauka’s system was shut down /? ran out of fuel.

In public statements Russians are being somewhat blasé about what happened…don’t see need for enquiry.

NASA not saying much in public….being diplomatic…in public…

Last edited by wiggy; 30th Jul 2021 at 16:05.
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Old 1st Aug 2021, 19:35
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Is it just me or did Nauka's skin look like already being damaged on ISS arrival? Like having had some overheat event or similar?

Like here, look at the lower left hand side please:
https://www.businessinsider.com/russ...station-2021-7

Last edited by Less Hair; 1st Aug 2021 at 19:56.
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Old 1st Aug 2021, 21:18
  #38 (permalink)  
 
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Just found a diagram - the area I think you are referring to is according to some diagrams occupied by some of the attitude control thrusters ..it’s mostly recessed, irregular in profile, and covered in a thermal blanket of some sort so it’s not a rigid panel, and there are a few nozzles sticking out through the blanket…, there certainly appears to be some discoloration, perhaps due to thermal effects or chemical effects but no idea if it was expected - wouldn’t be completely surprised if it was normal.

There still some debate going on about the attitude excursions that went on post docking……………
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