Soyuz 28

USSR

International Flight nº: 66

Earth orbit Flight nº: 63

USSR launch Flight nº: 35

First Interkosmos mission

Launch & orbit data:

Designation	10694 / 78023A
Launch date - time	02 Mar 1978 - 15:28:10 UT
Launch site	Baikonur, LC1
Launch vehicle	Soyuz 11A511U
OKB name - S/N°	Soyuz 7K-T s/n 45
Basic shape	Sphere-cylinder + 2 wings
Dimension (m)	7.5 long, 2.3 dia
Mass (kg)	6570? kg
Flight Crew (EP-2)	Gubarev, Aleksei A. (CDR) Remek, Vladimir (CR)
Call Sign	Zenit (Zenith)
Backup crew	Rukavishnikov N., Pelczak O.
Earth orbit on Mar 2.9:
- Perigee / Apogee	192 x 246 km
- Eccentricity	0.004
- Inclination	51.63°
- Period	88.82 min

Docking & landing data:

Docking date - time	03 Mar 1978 -17:09:30 UT
Target spacecraft/port	Salyut 6/ aft
Docking orbit on Mar 3.9:
- Perigee / Apogee	334 x 353 km
- Eccentricity	0.001
- Inclination	51.62°
- Period	91.35 min
Undocking date - time	10 Mar 1978 - 10:23:30 UT
Deorbit burn date - time	10 Mar 1978 - 12:54:34 UT
Landing date - time	10 Mar 1978 - 13:44:40 UT
Landing location	51°N, 67°E 135 km N of Arkalyk
Flight Duration (d:hr:min)	07d 22h 16m 30s (7.93 days)
Nbr orbits	125

Flight Crew

Nr.	Surname	Given name	Job	Duration
1	Gubarev	Aleksei Aleksandrovich	Commander	7d 22h 16m
2	Remek	Vladimír	Research cosm. - Czech	7d 22h 16m

Backup Crew: Pelczak & Rukavishnikov.

Mission details:

First Intercosmos-Mission with a Czech-Slowakian cosmonaut on board; docking on Salyut 6; crystall-growing experiments.
Soyuz 28 docked with Salyut 6 (2nd airlock) on 1978 Mar 3.715, with one Russian and one Czechoslovak cosmonaut; undocked 1978 Mar 10.43
Delivery to the Salyut-6 station of the first international 'Intercosmos' team consisting of A.A. Gubarev (USSR) and V. Remek (Czechoslovak Socialist Republic) to carry out scientific research and experiments jointly developed by Soviet and Czechoslovak specialists.

Salyut 6.

Astrophilately covers:

Launch cancel Baikonur.

Cosmic Mail: Cover on board of Salyut 6, with special Czech Post Office boardcancel. Signed by the Soyuz 26 and Soyuz 28 crew

Cosmic Mail: Cover on board of Salyut 6, with special Czech Post Office boardcancel. On 8 March Grechko used the Soviet and Czech cancellation on selected items. The cancel with date “-8 -3 78“ was the only on board of Salyut 6. signed by the Soyuz 26 and Soyuz 28 crew

Cosmic Mail: Cover on board of Salyut 6, special Poczta Post Office boardcancel. On 8 March Grechko used the Soviet and Czech cancellation on selected items. The cancel with date “-8 -3 78“ was the only on board of Salyut 6. signed by the Soyuz 26 and Soyuz 28 crew

Special Interkosmos cancel with undocking date: 10 03 78 boardcancel. Cancel only 1 day used in Praha.

Ceskoslovensko cover with special stamps and special Czech Post Office

Ref.: #1, #2, #4, #7, #8, #16, #125, #206, #210 - update: 05.09.25

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