2026-244Latest orbital launch: Falcon 9 · Starlink Group 15-16 · Oct 27, 2026 · VandenbergLaunch record →
sci-techmaventhe history of spaceflight, in data
  1. Home
  2. Spacecraft
  3. Cosmos 399
// optical imaging · 1971

Cosmos 399

Cosmos 399 was launched on March 3, 1971 aboard a Voskhod 11A57 from Baikonur. Latest status in GCAT: landed (Mar 17, 1971).

COSPAR 1971-017ANORAD 5003Soviet Union

Identity

Name in GCAT
Kosmos-399
Common name
Cosmos 399
Payload designation
Rotor No. 20L
Other names
Zenit-4M No. 20L:P,11F691 No. 770-57-12-220:RA
International designator
1971-017A
NORAD catalog number
5003
GCAT identifier
S05003
UN registration
A/AC.105/INF.231

Mission

Mission type
Optical imaging
Use
Defense
Program
Zenit-4M
Country
Soviet Union
Builder
TsKBEM Filial No. 3
Platform (bus)
Zenit-4M

Launch

Date
March 3, 1971 · 09:30 UTC
Launch record
1971-017Success
Spaceport
Baikonur · pad LC31

Orbit and fate

Orbit class (GCAT)
LLEO/I
Perigee
197 km
Apogee
317 km
Inclination
65.00°
Status
Landed
Status date
March 17, 1971
Last known active
Mar 17, 1971
End of operations
Mar 17, 1971

Size

Mass
2,200 kg
Dry mass
2,200 kg
Total mass with attached objects
6,000 kg
Length
6.0 m
Diameter
2.20 m
Span
6.0 m

Source: GCAT payload, deep-space and lander catalogs, Jonathan C. McDowell (CC BY 4.0); Wikidata Q13566853 (CC0).