1993-017B
The first SEDS mission, the Tether Dynamics Experiment, was launched at 0309 on 1993 Mar 30. The Delta 219 stage entered a 184 x 746 km x 33.96 deg orbit. After separation of the PAM-D upper stage with its Navstar payload, Delta 219 coasted to apogee, where at 0412 the SEDS tether began to deploy. After 75 min of unreeling, at 0527 the dynamics of the 19 km long tether were monitored for 14 minutes. At this point the effective orbit of the End Mass Payload (EMP) was 164 x 726 km. At 0541 the tether was severed at the deployer end, leaving the end mass and attached tether in a -50 x 726 km x 34.0 deg orbit. The end mass (1993-17B) reentered over Baja California at an altitude of 100 km beginning at 0616. The tether is believed to have remained attached down to about 110 km. Meanwhile, the Delta perigee was raised by several km. At 0612, Delta 219 made its depletion burn and ended up in a 305 x 1300 km x 36.2 deg orbit.
| SEDS-1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1993 Mar 30 | 0309:00? | Launch by Delta 7925 | CC LC17 |
| 0310 | SRM sep | ||
| 0311 | SRM sep | ||
| Stage 1 sep | |||
| SES-1 | |||
| Fairing sep | |||
| 0319 | Delta SECO-1 | 185 x 185 | |
| 0329? | T+20? Delta SES-2 | ||
| 0329? | T+20? Delta SECO-2 | 184 x 746 x 33.96 | |
| 0330? | Delta/SEDS sep from GPS/PAM-D | ||
| 0412:00 | SEDS deploy | ||
| 0420 | Length 600m | ||
| 0429 | Length 1400m | ||
| 0500 | Perigee | ||
| 0528 | Active braking of tether deploy | ||
| 0529 | Tether deploy complete | ||
| 0545:31 | Tether release | ||
| 0545:31 | Tether free | -50 x 726 x 34.0 | |
| 0558 | 41 km separation | ||
| 0603 | 64 km separation | ||
| 0612 | Delta depletion | 305 x 1300 x 36.2 | |
| 0616 | Reentry | ||
| 0622:27 | Alt. 85 km | ||
| 0623:27 | Alt. 70 km | ||
| 0624:27 | Alt 56 km | ||
| 0624:40 | Breakup | ||
| 0625:21 | Last flare near 18.8N 106.8W at 42 km | ||
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