Scout X-4 Launch History
Every orbital and deep-space launch attempt by the Scout X-4, year by year, drawn from the GCAT launch catalog. It is one of the variants covered on the Scout family page.
Data current as of 2026-07-20.
Scout X-4 made 12 orbital and deep-space launch attempts between 1963 and 1965. It is part of the Scout family. Of those, 11 succeeded and 1 failed. The success rate comes to 92 percent. The busiest year was 1964, with 7 flights. The most recent flight in the catalog was in 1965.
12
Launch attempts
11
Successes
1
Failures
92%
Success rate
Launches per year
Successes
Failures
Each bar links to that year's full chronology.
Year by year
Launch sites used
Sites the Scout X-4 launched from, across every launch in the catalog.
| Site | Country | Launches | Successes | Failures |
|---|---|---|---|---|
| WI | 🇺🇸United States | 5 | 5 | 0 |
| VS | 🇺🇸United States | 4 | 4 | 0 |
| PA | 🇺🇸United States | 3 | 2 | 1 |
Launch chronology
Every Scout X-4 launch in the catalog, newest first.
| Date | Designator | Payloads | Site / Pad | Outcome |
|---|---|---|---|---|
| Dec 6, 1965 | 1965-101 | S139R : Altair Fairing, X-259A3, Castor +5 more, Algol 2A S139R, deb FR-1, FR-1 despin weight, Altair 2 X-258E6 RH-126, FR-1 | VS / PALC-D | Success |
| Nov 19, 1965 | 1965-093 | S138R : Altair Fairing, X-259A3, Castor +4 more, Algol 2A S138R, SR 8 expt. cover, Altair 2 X-258E6 RH-125, Solar Explorer A | WI / LA3A | Success |
| Apr 29, 1965 | 1965-032 | S136R : Altair Fairing, X-259A3, Castor +4 more, Algol 2A S136R, Explorer 27 despin weight, Altair 2 X-258C3 RH-81, Beacon Explorer C | WI / LA3A | Success |
| Dec 15, 1964 | 1964-084 | S137R : Altair Fairing, X-259A3, Castor +4 more, Algol 2A S137R, San Marco 1 attach clamp, Altair 2 X-258C2 RH-75, San Marco A | WI / LA3A | Success |
| Nov 21, 1964 | 1964-076 | S135R : Altair Fairing, X-259A3, Castor +6 more, Algol 2A S135R, deb Explorer XXIV, AD canister cover, Altair 2 X-258C2 RH-74, Injun 4, AD-B | VS / PALC-D | Success |
| Nov 6, 1964 | 1964-074 | S133R : Altair Fairing, X-259A3, Castor +6 more, Algol 2A S133R, Altair 2 X-258C2 RH-73, [or Skylab part], deb Explorer XXIII, Explorer 23 antenna, NASA S-55C | WI / LA3 | Success |
| Oct 10, 1964 | 1964-064 | S123R : Altair Fairing, X-259A3, Castor +4 more, Algol 2A S123RR, Explorer XXII despin weight, Altair 2 X-258C2 RH-72, Beacon Explorer B | VS / PALC-D | Success |
| Aug 25, 1964 | 1964-051 | S134R : Altair Fairing, X-259A3, Castor +5 more, Algol 2A S134R, deb X-258 RH-68, X-258 launch debris, Altair 2 X-258C1 RH-68, NASA S-48 | VS / PALC-D | Success |
| Jun 25, 1964 | 1964-F08 | S128R : Altair Fairing, X-259A3, Castor +3 more, Algol 2A S128R, Altair 2 X-258C1 RH-66N, AFCRL B | PA / LC-D | Failure |
| Jun 4, 1964 | 1964-026 | S125R : Altair Fairing, X-259A3, Castor +6 more, Algol 2A S125R, Transit VC insulation, deb Transit VC, Altair 2 X-258C1 RH-55L, Transit VC despin weight, Transit VC | PA / LC-D | Success |
| Dec 19, 1963 | 1963-053 | S122R : 1963-053J Mistag, Altair Fairing, X-259A3 +8 more, Castor, Algol 2A S122R, deb Explorer XIX, AD-A Canister, deb Explorer 19, Canister part, Altair 2 X-258B1 RH-61, AD-A | PA / LC-D | Success |
| Jun 28, 1963 | 1963-026 | S113 : Altair Fairing, X-259A3, Castor +3 more, Algol 2A S113, Altair 2 X-258B1 RH-48, AFCRL A | WI / LA3 | Success |