Author Topic: Soyuz two-orbit rendezvous considered  (Read 1638 times)

Offline B. Hendrickx

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Soyuz two-orbit rendezvous considered
« on: 01/22/2017 08:06 PM »
RKK Energia is studying the possibility of introducing a two-orbit (three hour) rendezvous profile for Soyuz and Progress missions to the ISS. The two-orbit rendezvous is described in a paper that will be presented later this week at the Korolyov Readings in Moscow by RKK Energia’s Rafail Murtazin. The TASS news agency picked up on this and gave some details on the paper in this report (only in Russian) :

The idea is to launch Soyuz/Progress into a so-called "quasi co-planar” orbit. As described in the TASS report, the trick is to place the spacecraft into an orbit slightly different from that of the staton : “By an additional change in the orbit’s inclination a significantly smaller amount of propellant is needed for the subsequent matching of the orbit with that of ISS”.
The report says the technique may first be tried on a Progress-MS mission launched by the Soyuz 2-1a rocket in 2017 or 2018. A similar rendezvous profile may be used by the next-generation Federatsia spacecraft when it begins flying early next decade. It may also be used in the dual-launch profile currently envisaged for Russian circumlunar missions later in the 2020s.

Murtazin gave the same paper at the IAC 2016 congress in Mexico last September :

“Quasi-Coplanar Insertion to Implement Quick Two-Orbit Rendezvous Profile of Soyuz Spacecraft”

He wrote an article with a similar title for the TsNIIMash magazine “Kosmonavtika i Raketostroyeniye” in 2014, so the idea is clearly not new.


Offline mainmind

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Re: Soyuz two-orbit rendezvous considered
« Reply #1 on: 10/04/2017 08:34 PM »
Is this paper available anywhere besides the IAC website?

They will be attempting this rendezvous profile on Progress-68 on 12 October 2017.

Here's an interview with the author way back in 2013 discussing the faster approach profiles:

Offline rliebman

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Re: Soyuz two-orbit rendezvous considered
« Reply #2 on: 10/04/2017 08:50 PM »
likely a good concept.  can we / NSF team discuss applicability for crewed missions - Crewed Dragon and Starliner?  there must be significant pros and cons for the NASA and partners for this not to be part of their planning. 

Online Satori

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Re: Soyuz two-orbit rendezvous considered
« Reply #3 on: 10/04/2017 08:58 PM »
I think they will try it with Progress MS-07 to launch on October 12.

Offline russianhalo117

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Re: Soyuz two-orbit rendezvous considered
« Reply #4 on: 10/05/2017 02:16 AM »
I think they will try it with Progress MS-07 to launch on October 12.
according to anik in a another thread said final authorization to do so has not yet been given by Roscosmos but preparations by other entities are proceeding with the option to fall back to a 4 orbit plan.

EDIT: Approval was granted for the Progress only so far:
Two-orbit rendezvous was finally approved yesterday.
« Last Edit: 10/05/2017 02:41 PM by russianhalo117 »