Kosmos 398

Kosmos 398 (Russian: Космос 398; meaning Cosmos 398), also known as T2K No.2, was the second uncrewed test flight of the Soviet LK lander, using the T2K version. It followed the same program as Kosmos 379, launching on February 26, 1971 into a 276 km by 196 km orbit. It main objective was to validate contingency abort-to-lunar orbit manoeuvres.

Kosmos 398

LK Lander
Mission type	Spacecraft test
Operator	Soviet space program
COSPAR ID	1971-016A
SATCAT no.	4966
Mission duration	24 years, 9 months and 14 days
Spacecraft properties
Spacecraft	T2K No.2
Manufacturer	OKB-1
Launch mass	7,255 kilograms (15,995 lb)
Start of mission
Launch date	26 February 1971, 12:14:00 (1971-02-26UTC12:14Z) UTC
Rocket	Soyuz-L
Launch site	Baikonur 31/6
End of mission
Decay date	10 December 1995
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Eccentricity	0.006043
Perigee altitude	196 kilometres (122 mi)
Apogee altitude	276 kilometres (171 mi)
Inclination	51.63°
Period	88.9 minutes
Epoch	25 February 1971, 19:00:00 UTC[1]
LK (spacecraft) ← T2K No.1 T2K No.3 → Kosmos (satellites) ← Kosmos 397 Kosmos 399 →

See also

• Spaceflight portal

• 1971 in spaceflight