Kosmos 154 Explained

Kosmos 154
Mission Type:Orbital test flight
Lunar flyby (failed)
Operator:Soviet space program
Cospar Id:1967-032A
Satcat:2745
Spacecraft:Zond L1P No.3
Spacecraft Type:Soyuz 7K-L1P
Manufacturer:OKB-1
Launch Mass:5375 kg
Launch Date:8 April 1967, 09:07:00 GMT
Launch Rocket:Proton-K/D
Launch Site:Baikonur 81/23
Launch Contractor:OKB-1
Disposal Type:Launch failure
Decay Date:10 April 1967
Orbit Epoch:8 April 1967
Orbit Reference:Geocentric
Orbit Regime:Highly elliptical Earth
Orbit Periapsis:183 km
Orbit Apoapsis:223 km
Orbit Inclination:51.6°
Orbit Period:88.5 minutes
Programme:Zond program
Previous Mission:Kosmos 146
Next Mission:Zond 1967A
Programme2:Kosmos (satellites)
Previous Mission2:Kosmos 153
Next Mission2:Kosmos 155

Kosmos 154 (Russian: Космос 154 meaning Cosmos 154), also known as Zond No.3P, was a Soviet test spacecraft launched from the Baikonur aboard a Proton-K rocket. It was a prototype Soyuz 7K-L1 launched by Proton. It was an uncrewed precursor to the Zond series.

History

The spacecraft was designed to launch a crew from the Earth to conduct a flyby of the Moon and return to Earth. The primary focus was a Soviet circumlunar flight, which help document the Moon, and also show Soviet power. The test ran from the Zond program from 1967-1970, which produced multiple failures in the 7K-L1's re-entry systems. The remaining 7K-L1s were scrapped, ultimately replaced by the Soyuz 7K-L3.

Objectives

Two test flights of the UR-500K/L1 system were performed in March and April 1967 under the designations Kosmos 146 and Kosmos 154. In April 1967, under the cover name Kosmos-154, the third model of the L-1 was placed into near-Earth orbit. Because of a control system failure that resulted in the premature jettisoning of the ullage motors, the main propulsion system of the Block-D did not ignite. Kosmos 154 was one of the first Zond attempts. It was supposed to flyby the Moon but achieved Earth orbit only.

Mission

Kosmos 154 was launched using a Proton-K carrier rocket, which flew from Site 81/23 at Baikonur. The launch occurred at 09:07 GMT on 8 April 1967. Kosmos 154 was operated in an Earth orbit, it had a perigee of, an apogee of, an inclination of 51.6° and an orbital period of 88.5 minutes. Kosmos 154 had a mass of .

Kosmos 154 reached Earth orbit but the Blok D translunar injection stage failed to fire (ullage rockets, which had to fire to settle propellants in tanks before the main engine fired, were jettisoned prematurely). Kosmos 154 burned up two days later when orbit decayed, on 10 April 1967.