1958-007
The second ARPA/USAF/STL probe was launched at 0842 from 1958 Oct 11 by Thor Able from Canaveral. The second stage cut off too soon, and final velocity was 0.26 km/s short of the planned 10.74 km/s. Pioneer I reached an apogee of 113840 km. It reentered on Oct 13.
The vernier rockets fired; they failed to separate on command. They probably added about 20m/s to the velocity. The apogee motor firing would have put Pioneer in Earth orbit but ignition failed due to low battery temperatures.
There were 8 verniers with a total impulse of 1.89 kNs.
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| Pioneer 1 |
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| Date | Time | Event | Orbit |
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| 1958 Oct 11 | 0842:13 | Launch by Thor Able |
| | 0844:49 | T+2:36 Thor MECO 95 km 4.854 Vi | -5100 x 451 x 32.7 |
| | 0844:50? | Able burn |
| | 0846:36 | T+4:23 Able SECO 333 km | 72.65 -2807 x 1585 x 31.60 |
| | 0846:37? | Altair X248A3 burn |
| | 0847:20 | T+5:05 Altair burnout 445 km | |
| | 0850:02? | T+7:49? Altair sep |
| | | | -870 x 105600? x 35.9 |
| | 0850? | Vernier burn |
| | | | -870 x 113341 x 35.89 |
| | | T+12:55? Verniers jettison failed |
| 1958 Oct 12 | 0640? | Apogee |
| 1958 Oct 13 | 0359 | Reentry 21S 88.1W |
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Payload: