Efir

Soviet scientific spacecraft based on the Vostok/Zenit design; "Efir" is Russian for "ether". They were used to measure the energy spectrum and charge composition of primary cosmic rays with energy above 2 TeV. The Efirs were announced under the catchall Cosmos designation.

Related category

• SATELLITES AND SPACE PROBES

spacecraft	launch date	launch vehicle	site	orbit	duration	mass
Cosmos 1543	Mar. 10, 1984	Soyuz-U	Plesetsk	214 × 401 km × 62.8°	26 days	6,300 kg
Cosmos 1713	Dec. 27, 1985	Soyuz-U	Plesetsk	215 × 397 km × 62.8°	26 days	6,300 kg

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