Cosmos-1686 also known asTKS-4, was a heavily modified TKS spacecraft which docked unmanned
to the Soviet space station Salyut 7 as part of tests to attach scientific expansion modules to stations in Earth orbit.
Date of launch
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1985.09.27 08:41:42 UTC
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General characteristics
|
Orbit parameters
|
Total weight
|
20000 kg/44092 lb
|
Apogee
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284 km
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Launch vehicle
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"Proton-K 331-01"
|
Perigee
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280 km
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Launch type
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Ground
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Inclination
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51,6o
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Active life period
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1 year
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Equipment characteristics
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Scientific equipment weight
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1255 kg/2767 lb
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Purpose
Cosmos-1686 NSSDC / COSPAR ID: 1985-086A NORAD ID: 16095.
It was launched from Baiconur cosmodrom (USSR) and it was orbiting at altitudes 350 km
(till November 1986) and 480 km (since December 1986).
Cosmos1686 data collected from February to December 1986 is available.
Instrument package ELECTRON-4 (developed in SINP MSU) onboard Cosmos-1686 is capable of measuring high energy electrons with energy
>40 keV in 6 energy ranges and protons with energy >0.9 MeV in 3 energy ranges.
ELECTRON-4 Instrument Package
Dr. Yu.V. Mineev
The ELECTRON-4 instrument package onboard COSMOS-1686 satellite was created
in D.V. Skobeltsin Institute of Nuclear Physics Moscow State University (SINP MSU).
ELECTRON-4 consists of two simple instruments: ELECTRON-4A1 and ELECTRON-4A2.
The instruments are oriented in two orthogonal directions.
The orientation of COSMOS-1686 satellite is not fixed so the orientation of the detectors is undefined.
ELECTRON-4A1 and ELECTRON-4A2 consist of a similar telescopes
for observation of energetic charged particle spectra, and of similar packages of gas-discharge counters
for observation of low energy particles. Each telescope consists of 4 axial semiconductor n-p detectors
(n-p1, n-p2, n-p3 and n-p4 50mm, 2mm, 2mm and 2mm thick respectively) under aluminium passive shield
(about 2.7 g/cm2 thick) with field of view about 20 degrees.
The geometric factor of each telescope is 0.1 cm2×sr.
The gas-discharge counter package consists of two gas-discharge counters (gdc1 and gdc2)
under different passive shields (15 mg/cm2 and 1.1 mg/cm2, respectively).
Electrons
Electron energy [MeV] | Field of view [degrees] |
Effective Geometric Factor [cm2×sr] | Detector |
Passive shield [g/cm2] |
Ee>0.04 + Ep>0.5 | 46 | 0.04 | GDC1 | 0.81 |
Ee>0.1 + Ep>2.0 | 46 | 0.04 | GDC2 | 0.81 |
0.3÷0.6 | 20 | 0.08 | n-p2 + n-p3 | 2.7 |
0.6÷0.9 | 20 | 0.08 | n-p2 + n-p3 | 2.7 |
0.9÷1.2 | 20 | 0.06 | n-p2 + n-p3 | 2.7 |
1.2÷2.0 | 20 | 0.05 | n-p2 + n-p3 | 2.7 |
Protons
Proton energy [MeV] | Field of view [degrees] | Effective Geometric Factor [cm2×sr] | Detector | Passive shield [g/cm2] |
0.9÷8.0 | 20 | 0.1 | n-p1 | 2.7 |
2.0÷8.0 | 20 | 0.1 | n-p1 + n-p2 + n-p3 - n-p4 | 2.7 |
Ep>30.0 + Ee>2.0* | 20 | 0.1 | n-p4 | 0.81 |
* this channel of telescope on ELECTRON-4A2 is not operating.