Tuesday, April 14, 1992

Gemini 6A

 1965-104A


The planned GTA-6 (Gemini Titan Agena 6) mission was cancelled when the Agena docking target failed to reach orbit. In the replacement mission, Gemini Titan 6A, Spacecraft 6 would use Spacecraft 7 as a rendezvous target,without a docking. As Gemini 7 passed overhead, GT-6A sat on the pad ready for launch on Dec 12, 1965. But the Titan engines shut down 1.2s after ignition, before liftoff, and the launch was aborted. Crew commander Schirra decided not to eject, saving the mission for a second attempt 3 days later.

The Dec 15 launch went off smoothly at 1337. Six hours later, Schirra and Stafford had achieved the first ever rendezvous in space, stationkeeping a mere 37 metres from Gemini VII as both flew around the Earth. Finally, Schirra brought his spacecraft nose to nose with Borman's at a distance of only 0.3 metres. At 0051 on Dec 16, a brief engine firing saw the end of the rendezvous, and the Gemini VI-A crew left Borman and Lovell to continue their marathon flight. Schirra and Stafford splashed down later that day in the Atlantic at 23 25 N 67 50 W, and were recovered by the USS Wasp. Retrofire was 94 m/s aft, 35m/s down. 


GT-6A 
 

DateTimeEventOrbit  

1965 Dec 12  1454:06  Launch abort on pad 
 1533  Crew extracted from GT6 
1965 Dec 15  1337:26  Launch  
 1340:03  BECO 62 km  -5912 x 114 x 29.6 
 1340:03  T+2:36 Stage 1 sep 
 1343:02  T+5:36 SECO 
 1343:02  Orbit insertion 
 1343:20  T+5:56 Titan stage 2 sep  161 x 250 
 1343:20  IVAR burn  161 x 262 x 29 
 1343:34  T+6:08 IVAR off 
 1343:35  T+6:09 Fairings sep 
 1511:28  NH TCM height adjust, correct apo 24s 4m/s  161 x 272 x 29 
 1555:25  NCL TCM phase adjust 18m/s 77s 224 x 272 x 29 
 1619:33  10m/s 40s TCM plane change (node)  223 x 272 x 28.9 
 1640:45  0.2m/s 1s TCM height adjust (apo 2)  223 x 271 x 28.9 
 1725:03  TCM NSR coelliptic 13m/s 53s (apo 3)  270 x 274 x 28.9 
 1849  Tally ho GT7 
 1853  TPI (terminal phase) 10m/s 41s 
 1909  Terminal phase burn 
 1921  Terminal phase burn 
 1924  At 3 km 
 1927  At 750m 
 1929  At 250m 
 1931  At 35m, begin stationkeep 
 1933:26  Rendezvous with GT7 
 1934  At 35m 
 1943  At 6m 
 1948  At 3 m 
 2031  At 6m, night s'keep 
 0040?  At 20m, prepare to sep 
1965 Dec 16  0051:55  Sep burn 15s 3m/s 
 0303:18  3m/s 11s posigrade mvr  90.54 283 x 312 x 28.89 
 1452:54? Adapter module sep  270 x 274? x 28.9 
 1453:24  Retrofire 6N 180W 
 1453  Retrofire complete  -14 x 295 x 28.89  
 1454?  Retro jet 
 1454?  Docking bar jet 
 1513:34  Entry 400k 
 1528:47  Splashdown  
 1546Recovered by USS Wasp 

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