1959-001A
The Vanguard cloud cover satellite flew again on SLV-4 on 1959 Feb 17. Before launch it was referred to as the "Cloud Cover Satellite". The launch was successful and the payload became Vanguard II. Its photocells sent back crude images of terrestrial cloud cover for 18 days. The third stage bumped into the satellite which made it wobble, limiting the usefulness of the images. Satellite mass was 10.8 kg.
| Vanguard 2 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1959 Feb 17 | 1555 | Launch by Vanguard SLV-4 | CC LC18A |
| 1557 | T+2:24 Stage 1 burnout, 64 km | ||
| 1557 | T+2:25 Stage 1 sep, St 2 ig. | ||
| 1557 | T+2:52 Fairing sep | ||
| 1559 | T+4:20 Stage 2 burnout, 208 km | ||
| 1603 | T+8:47 Stage 2 sep | -5328 x 558 x 32.8 | |
| 1604 | T+9:02 Stage 3 ignition, 545 km | ||
| 1604 | T+9:35 Stage 3 burnoutn (33s), 545 km | ||
| 1604 | T+9:40 Stage 2 apogee, 558 km | ||
| 1607 | T+12:52 Stage 3 sep | 559 x 3320 x 32.88 | |
| Stage 3 and payload collide | |||
| 1959 Mar 7 | End of transmissions | ||
Payload:
- 108 MHz transmitter
- Photocells (2) (USA SRDL/Ft Mon)
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