Mir EO-5

Mission type| Mir expedition
Mission duration| 166 days, 6 hours, 58 minutes (launch to landing)
Orbits completed| 2,631
Expedition
Space Station| Mir
Began| 7 September 1989, 22:25:26 (1989-09-07UTC22:25:26Z) UTC
Ended| 19 February 1990, 01:06:20 (1990-02-19UTC01:06:21Z) UTC
Arrived aboard| Soyuz TM-8
Departed aboard| Soyuz TM-8
Crew
Crew size| Two
Members| Alexander Viktorenko
Aleksandr Serebrov

Long-term Mir expeditions

<- EO-4

EO-6 ->

MIR configuration in 1989

Mir EO-5 was the 5th long duration expedition to the space station Mir, which lasted from September 1989 to February 1990. The two person crew was launched and landed in the spacecraft Soyuz TM-8, which remained docked to Mir throughout the mission. The crew are often referred to as the Soyuz TM-8 crew.

## Contents

* 1 Crew
* 2 Background
* 3 Mission Highlights
* 3.1 Launch and arrival
* 3.2 Spacewalks
* 3.3 Science activities
* 3.4 Soyuz TM-9 and landing
* 4 References

## Crew

The crew consisted of two Soviet cosmonauts. They had both been in space, but only Viktorenko had previously been to Mir, which was a 7-day visit during Mir EP-1.[1]

Mir EO-5 | Name | Spaceflight | Launch | Landing | Duration

|
|
|
|
|

Commander  |  Alexander Viktorenko  | Second  | 5 September 1989
Soyuz TM-8 | 19 February 1990
Soyuz TM-8  | 166 days
Flight Engineer  |  Aleksandr Serebrov | Third

The backup crew for the mission were Anatoly Solovyev (Commander) and Aleksandr Balandin (Flight Engineer), who ended up being the crew of the following expedition, EO-6.[2]

## Background

The EO-5 mission was originally scheduled to launch in April 1989.[3] However, in March 1989, the Soyuz spacecraft that was intended to be utilized for the mission was seriously damaged during testing in a vacuum chamber.[3] As a result, the crew of Mir EO-4, which was then in orbit, landed in April as planned, and left Mir unmanned until the arrival of EO-5 in September of the same year.[3]

## Mission Highlights

### Launch and arrival

Both crew members arrived via the spacecraft Soyuz TM-8, which launched on 5 September 1989. The crew had to perform a manual docking to the space station as the Kurs rendezvous and docking system malfunctioned.

### Spacewalks

During their stay on Mir, the crew members performed 5 EVAs. These took place on 8 January 1990 (2h 56m) to mount two star sensors for navigation on the Kvant-module, 11 January (2h 54m) to attach tools and remove a space exposure experiment rack, 26 January (3h 2m) using the new Orlan-DMA spacesuits. The cosmonauts attached a mooring post to the outside of the airlock compartment and removed a Kurs antenna so it could not interfere with future EVAs. The fourth EVA took place on 1 February (4h 59m) to test 'Ikar', a maneuvering unit. The final EVA was on 5 February (3h 45m).

### Science activities

While on Mir, the crew took part in experiments in the fields of medicine, geophysics, space technology, earth observation, astronomy and materials sciences.

### Soyuz TM-9 and landing

On 13 February, Soyuz TM-9 arrived at the station carried the next long duration crew members, EO-6.[2] Docking was uneventful, but prior to docking the EO-6 crew had noticed that some thermal insulation blankets on the Soyuz TM-9 descent module were loose. Procedures were developed to ensure the spacecraft maintained an appropriate temperature, and once ground control considered the situation manageable, the EO-5 crew returned to Earth.

The expedition officially ended on 19 February 1990 as the 2 crew members returned on Soyuz TM-8. Landing occurred a few hours after undocking, 55 km northeast of Arkalyk.[4] During their stay upon Mir, the crew completed 2631 orbits of Earth, and the mission in total lasted 166d 06h 58m from launch to landing.

## References

1. ↑ Mark Wade. "Mir EP-1". Encyclopedia Astronautica. Archived from the original on 29 November 2010. https://web.archive.org/web/20101129180139/http://astronautix.com/flights/mirep1.htm. Retrieved 6 November 2010.
2. ↑ 2.0 2.1 Mark Wade. "Mir EO-5". Encyclopedia Astronautica. Archived from the original on 9 April 2007. https://web.archive.org/web/20070409191451/http://astronautix.com/flights/mireo5.htm. Retrieved 6 November 2010.
3. ↑ 3.0 3.1 3.2 Hendrickx, Vis, p. 243
4. ↑ "Soyuz TM-8". Spacefacts. http://www.spacefacts.de/mission/english/soyuz-tm8.htm. Retrieved 6 November 2010.

* Bart Hendrickx, Bert Vis, "Energiya-Buran: the Soviet space shuttle", Springer Praxis books, 2010, p. 526.

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Expeditions to Mir

Long-term|

* EO-1
* EO-2
* EO-3
* EO-4
* EO-5
* EO-6
* EO-7
* EO-8
* EO-9
* EO-10
* EO-11
* EO-12
* EO-13
* EO-14
* EO-15
* EO-16
* EO-17
* EO-18
* EO-19
* EO-20
* EO-21
* EO-22
* EO-23
* EO-24
* EO-25
* EO-26
* EO-27
* EO-28

Short-term|

* EP-1
* EP-2
* EP-3 ...

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