Monday, May 24, 1999

Globalstar 23

 1999-004A


Launch 1999 Feb by Starsem Soyuz-Ikar. Ikar flew over 30 missions as a spacecraft propulsion system. Used as Kometa propulsion. The dispenser was built by Aerospatiale/Aquitaine.

Ikar dry mass 820 kg, fuel 842 kg, dispenser 390 kg, satellites dry 1524 kg, fuel for satellites 288 kg, total 3864 kg. Ikar uses 17D61 N2O4/UDMH with 2943 N thrust (3383N including 4 side thrusters) Isp for Ikar is 326 s so Ve = 3197 m/s, mdot = 0.92 kg/s or 1.06 kg/s. (If all fuel used in 610s, mdot is 1.38 kg/s for T=4412N)

Burn 1 was 352s, so 372 kg, dV = ln 3864 / 3492 = 324 m/s. Actual more like 180m/s implies 211 kg used, for mdot of 0.6 kg/s and mean thrust 1.9 kN. This means Ikar mass now 820 + 390 + 631 = 1841 kg. Maybe inefficiencies used up more prop. Ikar is then 820 + 390 + 470 = 1680 kg.


Globalstar FM36 
 

DateTimeEventOrbit  

1999 Feb 9  0354:00  Launch by Soyuz-U  KB 
 0355:58 T+1:58 Blok B-D sep 
 0356:38  T+2:38 Fairing sep 
 0358:47  T+4:43 Blok A sep, 215 km 
 0358:56  T+4:56 Interstage sep 
 0402:45  T+8:45 MECO 
 0402:48  T+8:48 Stage 3 sep  236 x 884 x 52.0 
 0623:31  T+2:29:31 Ikar burn 
 0629:23  Ikar MECO after 5:52 
 0724:30  T+3:30:30 Sep from Ikar  915 x 947 x 52.0 
 0724:34  T+3:30:34 Sep KA-4   
1999 Feb 10  0546:48  Ikar deorbit burn 4:18 
 0633? Entry, Impact Pacific 50 55S 140 W 
1999 Feb 13    103.59 908 x 947 x 52.0 
1999 Feb 25    105.53 1004 x 1033 x 52.0 
1999 Mar 4    110.63 1240 x 1270 x 52.0 
1999 Mar 8    112.61 1336 x 1355 x 52.0 
1999 Mar 14    114.07 1410 x 1415 x 52.0

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