Date
Mission
Thor-Delta Successful*
.
1-22
OSO 5
Yes
1-20
Isis I
Yes
2-5
Intelsat III F-3
Yes
2-26
ESSA 9
Yes
5-21
Intelsat III F-4
Yes
6-21
Explorer 41
Yes
6-28
Biosatellite 3
Yes
7-25
Intelsat III F-5
No; 3d stage malfunctioned (motor
case ruptured or nozzle failed)
8-9
OSO 6/Pac
Yes
8-27
Pioneer E/TETR C
No; 3d stage malfunctioned (vibrating
relief valve caused hydraulic oil leak)
11-21
Skynet I
Yes
1-14
Intelsat III F-6
Yes
1-23
Itos l/Oscar 5
Yes
3-20
NATO I
Yes
4-22
Intelsat III F-7
Partial; booster underperformed but
spacecraft thrusters helped put payload into proper
orbit
7-23
Intelsat III F-8
Yes
8-19
Skynet 2
Yes
12- 11
NOAA I /Cepe
Yes
2-2
NATO 2
Yes
3-13
Explorer 43
Yes
3-31
Isis 2
Yes
9-29
OSO 7/TETR 3
Partial; 2d stage anomaly led to
spacecraft separation at wrong pitch angle
10-21
Itos B
No; 2d stage malfunctioned (oxidizer
system leak)
1-31
HEOS 2
Yes
3-11
TD-IA
Yes
7-23
ERTS I
Yes
9-22
Explorer 47
Yes
10-15
NOAA2/Oscar 6
Yes
11-9
Anik I
Yes
12-10
Nimbus 5
Yes
4-20
Anik 2
Yes
6-10
Explorer 49
Yes
7-16
Itos E
No; 2d stage malfunctioned (hydraulic
pump failure)
10-25
Explorer 50
Yes
11-6
NOAA 3
Yes
12-15
Explorer 51
Yes
Date
Mission
Thor-Delta Successful*
.
1-18
Skynet 11 A
Yes
4-13
Westar I
Yes
5-17
SMS I
Yes
10-10
Westar 2
Yes
11-15
NOAA 4/lntesat/Amsat Oscar 7
Yes
11-22
Skynet II B
Yes
12-18
Symphonie I
Yes
1-22
Landsat 2
Yes
2-6
SMS 2
Yes
4-9
GEOS 3
Yes
5-7
Anik 3
Yes
6-12
Nimbus 6
Yes
8-8
COS B
Yes
8-27
Symphonie 2
Yes
10-6
Explorer 54
Yes
10- 16
GOES I
Yes
11-20
Explorer 55
Yes
12- 13
Satcom I
Yes
1-17
CTS I
Yes
2- 19
Marisat I
Yes
3-26
Satcom 2
Yes
4-22
NATO III A
Yes
5-4
Lageos
Yes
6-10
Marisat 2
Yes
7-8
Palapa I
Yes
7-29
NOAA 5
Yes
10- 14
Marisat 3
Yes
1-28
NATO III B
Yes
3- 10
Palapa 2
Yes
4-20
GEOS
No; 3d stage malfunctioned;
spacecraft apogee motor placed spacecraft into alternate
orbit after 3d stage failed to put payload into transfer
orbit
6-16
GOES 2
Yes
7-14
GMS
Yes
8-25
Sirio
Yes
10-22
ISEE l/ISEE 2
Yes
11-23
Meteosat
Yes
12-15
CS (Sakura)
Yes
Date
Mission
Thor-Delta Successful*
.
1-26
IUE
Yes
3-5
Landsat 3/Oscar 8
Yes
4-7
BSE
Yes
5-11
OTS 2
Yes
6-16
GOES 3
Yes
7-14
GEOS 2
Yes
8-12
ISEE 3
Yes
10-24
Nimbus 7/Cameo
Yes
11-13
HEAO 2
Yes
11-19
NATO III C
Yes
12- 16
Anik 4
Yes
* 7 failures-partial failures out of 84 attempts (91.6% successful).