Country of originUnited States
Height22 metres (72 ft)
Diameter1.02 metres (3 ft 4 in)
Mass17,000 kilograms (37,000 lb)
Associated rockets
Launch history
Launch sitesPoint Arguello LC-D
Total launches1
UTC date of spacecraft launch1963-09-27
First stage – Algol 1D
Powered by1 solid
Maximum thrust440 kilonewtons (99,000 lbf)
Burn time44 seconds
Second stage – Castor 1A
Powered by1 solid
Maximum thrust286 kilonewtons (64,000 lbf)
Specific impulse247 sec
Burn time27 seconds
Third stage – Antares 2A
Powered by1 X-254
Maximum thrust93 kilonewtons (21,000 lbf)
Specific impulse293 sec
Burn time36 seconds
Fourth stage – Altair 2A
Powered by1 X-258
Maximum thrust22 kilonewtons (4,900 lbf)
Specific impulse266 sec
Burn time28 seconds

The Scout X-2B was an American expendable launch system which was flown during 1963. It was a four-stage rocket, based on the earlier Scout X-2, but with an Altair 2A fourth stage in place of the Altair 1A used on the X-2. It was a member of the Scout family of rockets.

The Scout X-2 was an all-solid rocket, with an Algol 1D first stagea Castor 1A second stage, an Antares 2A third stage, and an Altair 2A fourth stage. It made only one flight, which was launched from Launch Complex D at Point Arguello, carrying a P-35 weather satellites, P35-5. The launch occurred on 27 September 1963, and failed to achieve orbit.


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  • McDowell, Jonathan. "Scout". Orbital & Suborbital Launch Database. Jonathan's Space Page. Retrieved 2009-07-03.
  • Heyman, Jos; Parsch, Andreas (2007-07-09). "LTV SLV-1 Scout". Appendix 3: Space Vehicles. Directory of U.S. Military Rockets and Missiles. Retrieved 2009-07-03.