Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

Explorer-Program

Explorer 1 [NASA]

ICON (MIDEX 8) [Orbital ATK]

Explorer Name Date S LS Launch Vehicle Mass (kg) Remarks
1958
1 Explorer 1 01.02.1958 CC Juno-1 14
2 Explorer 2 05.03.1958 F CC Juno-1 14
3 Explorer 3 26.03.1958 CC Juno-1 14
4 Explorer 4 26.07.1958 CC Juno-1 17
5 Explorer 5 24.08.1958 F CC Juno-1 17
1959
(6) S 1 16.07.1959 F CC Juno-2 41
6 S 2 07.08.1959 CC Thor-DM18 Able-3 64
7 S 1a 13.10.1959 CC Juno-2 41
1960
(8) S 46 23.03.1960 F CC Juno-2 41
8 S 30 03.11.1960 CC Juno-2 41
(9) S 56 04.12.1960 F WI Scout-X1 36
1961
9 S 56a / AD 1 16.02.1961 WI Scout-X1 36
(10) S 45 25.02.1961 F CC Juno-2 34
10 P 14 25.03.1961 CC Delta 35
11 S 15 27.04.1961 CC Juno-2 43
(12) S 45a 24.05.1961 F CC Juno-2 41
(12) S 55 30.06.1961 F WI Scout-X1 85
12 EPE A / S 3 16.08.1961 CC Delta 38
13 S 55a 25.08.1961 P WI Scout-X1 85
14 EPE B / S 3a 02.10.1961 CC Delta-A 40
1962
15 EPE C / S 3b 27.10.1962 CC Delta-A 45
16 S 55b 16.12.1962 WI Scout-X3 101
1963
17 AE A / S 6 03.04.1963 CC Delta-B 184
18 IMP A / S 74 (IMP 1) 27.11.1963 CC Delta-C 62
19 AD A / S 56b 19.12.1963 Va Scout-X4 7
1964
(20) BE A / S 66 19.03.1964 F CC Delta-B 120
20 IE A / S 48 25.08.1964 Va Scout-X4 44
21 IMP B (IMP 2) 04.10.1964 CC Delta-C 62
22 BE B / S 66a 10.10.1964 Va Scout-X4 53
23 S 55c 06.11.1964 WI Scout-X4 134
24 AD B / S 56c 21.11.1964 Va Scout-X4 9 with IE B
25 IE B / Injun 4 40 with AD B
26 EPE D 21.12.1964 CC Delta-C 46
1965
27 BE C 29.04.1965 WI Scout-X4 60
28 IMP C (IMP 3) 29.05.1965 CC Delta-C 59
29 GEOS A 06.11.1965 CC Delta-E 175
30 SE A / Solrad 8 / IQSY 19.11.1965 WI Scout-X4 57
31 DME A 29.11.1965 Va Thor-DM21 Agena-B 98 with Alouette 2
1966
32 AE B 25.05.1966 CC Delta-C1 225
33 IMP D (AIMP 1) 01.07.1966 CC Delta-E1
1967
34 IMP F (IMP 4) 24.05.1967 Va Delta-E1 74
35 IMP E (AIMP 2) 19.07.1967 CC Delta-E1
1968
36 GEOS B 11.01.1968 Va Delta-E1 209
37 SE B / Solrad 9 05.03.1968 WI Scout-B 90
38 RAE A 04.07.1968 Va Delta-J 188
39 AD C 08.08.1968 Va Scout-X4 9 with IE C
40 IE C / Injun 5 71 with AD C
1969
41 IMP G (IMP 5) 21.06.1969 Va Delta-E1 79
1970
42 SAS A / Uhuru 12.12.1970 SM Scout-B 163
1971
43 IMP I (IMP 6) 13.03.1971 CC Delta-M6
44 SE C / Solrad 10 08.07.1971 WI Scout-B 118
45 SSS A, S-Cubed A 15.11.1971 SM Scout-B 52
1972
46 MTS A 13.08.1972 WI Scout-D1 90
47 IMP H (IMP 7) 23.09.1972 CC Delta-1604 390
48 SAS B 15.11.1972 SM Scout-D1 186
1973
49 RAE B 10.06.1973 CC Delta-1913
50 IMP J (IMP 8) 26.10.1973 CC Delta-1604 81
51 AE C 16.12.1973 Va Delta-1900 658
1974
52 IE D / Injun 6 / Hawkeye 03.06.1974 Va Scout-E1 27
1975
53 SAS C 07.05.1975 SM Scout-F1 195
54 AE D 06.10.1975 Va Delta-2910 676
55 AE E 20.11.1975 CC Delta-2910 721
(56) DAD A 06.12.1975 F Va Scout-F1 40 with DAD B
(57) DAD B 9 with DAD A
1976
1977
56 ISEE 1 22.10.1977 CC Delta-2914 340 with ISEE 2
1978
57 IUE 26.01.1978 CC Delta-2914 1479 / 669
58 HCMM (AEM 1) 26.04.1978 Va Scout-D1 134
59 ISEE 3 → ICE 12.08.1978 CC Delta-2914 469
1979
60 SAGE (AEM 2) 18.02.1979 WI Scout-D1 149
61 Magsat (AEM 3) 30.10.1979 Va Scout-G1 181
1980
1981
62 DE 1 03.08.1981 P Va Delta-3913 400 with DE 2
63 DE 2 400 with DE 1
64 SME 06.10.1981 Va Delta-2310 437 with OSCAR 9
1982
1983
1984
65 CCE (AMPTE 1) 16.08.1984 CC Delta-3924 240 with IRM, UKS
1985
1986
1987
1988
1989
66 COBE 18.11.1989 Va Delta-5920 2250
1990
1991
1992
67 EUVE 07.06.1992 CC Delta-6920-10 3256
68 SAMPEX (SMEX 1) 03.02.1992 Va Scout-G1 158
1993
1994
1995
69 XTE (RXTE) 30.12.1995 CC Delta-7920-10 3045
1996
70 FAST (SMEX 2) 21.08.1996 Va Pegasus-XL 180
1997
71 ACE 05.08.1997 CC Delta-7920-8 765
1998
72 SNOE (STEDI 1) 26.02.1998 Va Pegasus-XL 132 with Batsat
73 TRACE (SMEX 4) 02.04.1998 Va Pegasus-XL 225
74 SWAS (SMEX 3) 06.12.1998 WI Pegasus-XL 283
1999
75 WIRE (SMEX 5) 05.03.1999 Va Pegasus-XL 275
76 TERRIERS (STEDI 2) 18.05.1999 Va Pegasus-XL HAPS 121 with MUBLCOM
77 FUSE (MIDEX 0) 24.06.1999 CC Delta-7320-10C 1360
2000
78 IMAGE (MIDEX 1) 25.03.2000 Va Delta-7326 494
79 HETE 2 09.10.2000 Kw Pegasus-H 124
2001
80 MAP (WMAP, MIDEX 2) 30.06.2001 CC Delta-7425-10C 800
2002
81 HESSI (RHESSI, SMEX 6) 05.02.2002 CC Pegasus-XL 293
(Int) INTEGRAL 17.10.2002 Ba Proton-K Blok-DM-2 4100 Participation on INTEGRAL
2003
82 CHIPSat (UNEX 1) 13.01.2003 Va Delta-7320-10C 60 with ICESAT
83 GALEX (SMEX 7) 28.04.2003 CC Pegasus-XL 312
2004
84 Swift (MIDEX 3, Neil Gehrels Swift Observatory) 20.11.2004 CC Delta-7320-10C 1331
2005
(MoO) Astro E2 10.07.2005 Ka M-5 (2) 1700 Instrument on Astro E2
2006
(MoO) TWINS A 28.06.2006 Va Delta-4M+(4,2) Payload on Trumpet 4
2007
85 THEMIS P1 (MIDEX 5A) → ARTEMIS P1 17.02.2007 CC Delta-7925-10C 100 with THEMIS P2, P3, P4, P5
86 THEMIS P2 (MIDEX 5B) → ARTEMIS P2 100 with THEMIS P1, P3, P4, P5
87 THEMIS P3 (MIDEX 5C) 100 with THEMIS P1, P2, P4, P5
88 THEMIS P4 (MIDEX 5D) 100 with THEMIS P1, P2, P3, P5
89 THEMIS P5 (MIDEX 5E) 100 with THEMIS P1, P2, P3, P4
90 AIM (SMEX 9) 25.04.2007 Va Pegasus-XL 200
2008
(MoO) TWINS B 13.03.2008 Va Atlas-5(411) Payload on Trumpet 5
(MoO) CINDI 16.04.2008 Kw Pegasus-XL 395 Instruments on C/NOFS
91 IBEX (SMEX 10) 19.10.2008 Kw Pegasus-XL [Star-27] 105
2009
92 WISE (MIDEX 6) (ex NGSS) → NEOWISE 14.12.2009 Va Delta-7320-10C 532
2010
2011
2012
93 NuSTAR (SMEX 11) 13.06.2012 Kw Pegasus-XL 360
2013
94 IRIS (SMEX 12) 28.06.2013 Va Pegasus-XL 236
2014
2015
2016
(MoO) NeXT 07.02.2016 Ta H-2A-202 2700 Instrument on Astro H
2017
(MoO) NICER 03.05.2017 CC Falcon-9 v1.2 372 Instrument on ISS
2018
(MoO) GOLD 25.01.2018 Ko Ariane-5ECA 4423 Instrument on SES 14 comsat
95 TESS (MIDEX 7) 18.04.2018 CC Falcon-9 v1.2 365
2019
96 ICON (MIDEX 8) 11.10.2019 CC Pegasus-XL 288
2020



Planned:
 

Explorer Name Date Suc LS Launch Vehicle Mass (kg) Remarks
2021
IXPE (SMEX 14) xx.04.2021 CC Falcon-9 v1.2 (Block 5) 292 with ?
2022
(MoO) AWE 2022 Instrument on ISS
(MoO) Resolve 2022 Ta H-2A-202 2700 Instrument on XRISM (XARM)
2023
PUNCH-NFI (SMEX 15) xx.xx.2023
PUNCH-WFI 1 (SMEX 15)
PUNCH-WFI 2 (SMEX 15)
PUNCH-WFI 3 (SMEX 15)
TRACERS A (SMEX 16A)
TRACERS B (SMEX 16B)
SPHEREx (MIDEX 9) xx.xx.2023
(MoO) SunRISE 1 xx.xx.2023 ? ?
(MoO) SunRISE 2
(MoO) SunRISE 3
(MoO) SunRISE 4
(MoO) SunRISE 5
(MoO) SunRISE 6



Cancelled or status unclear:
 

Explorer Name Date Suc LS Launch Vehicle Mass (kg) Remarks
Owl 1 cancelled 1966 ? Va Scout-A 70
Owl 2 cancelled 1966 ? Va Scout-A 70
MSS A cancelled 197x ? WI Scout-B ? 36
CATSAT (STEDI 3) cancelled Va Delta-7320-10C 109 with ICESAT
IMEX (UNEX 2) cancelled CC Titan-402B IUS 159 with DSP 22
FAME (MIDEX 4) cancelled CC Delta-7425-10C
SPIDR (SMEX 8) cancelled 2003 Va Pegasus-XL [Star-26C]
GEMS (SMEX 13) cancelled 2012 CC Pegasus-XL * 267

* = Launch vehicle baselined