Editing Project Mercury (section)

===Canceled===
[[File:Jupiter_atlas_redstone_rockets_comparison.jpg|alt=Mercury-Jupiter (center) compared with Redstone (left) and Atlas (right).|thumb|Mercury-Jupiter (center) compared with Redstone (left) and Atlas (right).]]
Nine of the planned flights were canceled. 

Mercury-Jupiter was a proposed suborbital launch configuration consisting of a [[PGM-19 Jupiter|Jupiter missile]] carrying a Mercury capsule. Two flights were planned in support of [[Project Mercury]]. The Mercury-Jupiter 1 flight would have been a heat shield test. The Mercury-Jupiter 2 flight was planned as a maximum dynamic pressure qualification test of the production Mercury spacecraft with a chimpanzee on board.<ref>{{cite web |title=Mercury-Jupiter MJ-2 |url=http://astronautix.com/flights/merr2mj2.htm |archive-url=https://web.archive.org/web/20111013154511/http://astronautix.com/flights/merr2mj2.htm |archive-date=2011-10-13 |website=Encyclopedia Astronautica}}</ref> On July 1, 1959, less than a year after the October, 1958 program start date, the flights were canceled due to budget constraints.<ref>{{cite web |last=Grimwood |first=James M. |title=Project Mercury – A Chronology – PART II (A) Research and Development Phase of Project Mercury |url=https://history.nasa.gov/SP-4001/p2a.htm |access-date=2024-03-01 |website=NASA |id=NASA SP-4001}}</ref> 

Suborbital flights were planned for four other astronauts but the number of flights was cut down gradually and finally all remaining were canceled after Titov's flight.{{sfn|Alexander & al.|1966|p=377}}{{sfn|Catchpole|2001|p=474}}{{refn|group=n|Within the Mercury Project organization the suborbital flights were from the start criticized as being of little value and even compared to a circus act.{{sfn|Alexander & al.|1966|p=100}}}} 

Mercury-Atlas 9 was intended to be followed by more one-day flights and even a three-day flight but with the coming of the Gemini Project it seemed unnecessary. The Jupiter booster was, as mentioned above, intended to be used for different purposes.

{| class="wikitable"
|-
! Mission
!Pilot
!  Planned Launch
!  Cancellation
|-
| Mercury-Jupiter 1
|
|
| July 1, 1959{{sfn|Grimwood|1963|p=81}}
|-
| Mercury-Jupiter 2
| Chimpanzee
| First quarter, 1960
| July 1, 1959{{sfn|Grimwood|1963|p=81}}{{refn|group=n|Proposed maximum dynamic pressure test for capsule.<ref name="MJ2" />}}
|-
| Mercury-Redstone 5
| Glenn (likely)
| March 1960{{sfn|Catchpole|2001|p=474}}
| August 1961{{sfn|Cassutt|Slayton|1994|p=104}}
|-
| Mercury-Redstone 6
|
| April 1960{{sfn|Catchpole|2001|p=474}}
| July 1961{{sfn|Cassutt|Slayton|1994|p=101}}
|-
| Mercury-Redstone 7
|
|May 1960{{sfn|Catchpole|2001|p=474}}
|
|-
|Mercury-Redstone 8
|
|June 1960{{sfn|Catchpole|2001|p=474}}
|
|-
| [[Mercury-Atlas 10]]
| Shepard
| October 1963
| June 13, 1963{{refn|group=n|Mercury-Atlas 10 was intended to be a three-day mission in November 1962 with extra supplies attached to the heat shield. Call-sign ''Freedom 7-II''. By January 1963, it was changed to a one-day back up mission for Mercury-Atlas 9. It was canceled after the success of the latter.{{sfn|Catchpole|2001|pp=385–386}}}}
|-
| Mercury-Atlas 11
| Grissom
| Fourth quarter, 1963
| October 1962<ref name="Mercury-Atlas 11"/>
|-
| Mercury-Atlas 12
| Schirra
| Fourth quarter, 1963
| October 1962<ref name="Mercury-Atlas 12"/>
|}