1974-019A
Kosmos-639 flew an 11 day polar orbital mission from Plesetsk at 81.3 deg, continuing the tradition of April ice monitoring flights.
| Kosmos-639 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1974 Apr 4 | 0830 | Launch by 11A57 | PL |
| 0834 | Blok-I burn | ||
| 0838 | Blok-I sep | ||
| 0948 | 88.79 205 x 224 x 81.3 | ||
| 1974 Apr 4 | 1200 | 88.85 206 x 226 x 81.31 (RAE) | |
| 1974 Apr 5 | 0036 | 88.77 205 x 222 x 81.3 | |
| Lower perigee | |||
| 1974 Apr 6 | 0751 | 88.79 181 x 247 x 81.3 | |
| 1974 Apr 6 | 1900 | 88.84 181 x 250 x 81.31 (RAE) | |
| 1974 Apr 8 | 1308 | 88.73 178 x 245 x 81.3 | |
| 1974 Apr 14 | 1658 | 88.54 174 x 230 x 81.3 | |
| 1974 Apr 14 | 2230? | Engine sep | 88.34 163 x 220 x 81.3 |
| 1974 Apr 15 | 0443? | Retrofire | |
| 0453? | PO sep | ||
| 0458? | Entry | ||
| 0511? | Landed after 10.8d | ||
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