S-56 (satellite)

S-56 was an American satellite launched by NASA on 4 December 1960 as part of the Explorers program.[1] The satellite was composed of a 3.66 meter (12 foot) diameter inflatable sphere, and was intended to study the density of the upper atmosphere. S-56 was launched on a Scout X-1 rocket, but failed to reach orbit due to the second stage not igniting. It was replaced by the identical Explorer 9 (S 56A) spacecraft.[2]

Citations

"S-56". Encyclopedia Astronautica.
"Explorer: AD". Gunter's Space Page.

Explorers Program

List of Explorers Program missions

Missions

1958–1992	Explorer 1 2^† 3 4 5^† S-1^† 6 (S-2) 7 (S-1A) S-46A^† 8 S-56^† 9 (S-56A) S-45^† 10 11 (S-15) S-45A^† S-55^† 12 (EPE-A) 13 (S-55A) 14 (EPE-B) 15 (EPE-C) 16 (S-55B) 17 (AE-A) 18 (IMP-A) 19 (AD-A) S-66A (BE-A)^† 20 (IE-A) 21 (IMP-B) 22 (BE-B) 23 (S-55C) 24 (AD-B) 25 (Injun 4, IE-B) 26 (EPE-D) 27 (BE-C) 28 (IMP-C) 29 (GEOS-A) 30 (Solrad 8) 31 (DME-A) 32 (AE-B) 33 (IMP-D) 34 (IMP-F) 35 (IMP-E) 36 (GEOS-B) 37 (Solrad 9) 38 (RAE-A) 39 (AD-C) 40 (Injun 5) 41 (IMP-G) 42 (Uhuru, SAS-A) 43 (IMP-H) 44 (Solrad 10) 45 (SSS-A) 46 (MTS) 47 (IMP-I) 48 (SAS-B) 49 (RAE-B) 50 (IMP-J) 51 (AE-C) 52 (Hawkeye 1) 53 (SAS-C) 54 (AE-D) 55 (AE-E) DADE-A^† DADE-B^† 56 (ISEE-1) 57 (IUE) 58 (HCMM) 59 (ICE) 60 (SAGE) 61 (Magsat) 62 (DE-1) 63 (DE-2) 64 (SME) 65 (CCE) 66 (COBE) 67 (EUVE)
MIDEX	69 (RXTE) 71 (ACE) 77 (FUSE) 78 (IMAGE) 80 (WMAP) FAME 84 (Swift) 85–89 (THEMIS) 92 (WISE) 95 (TESS) 96 (ICON) SPHEREx
SMEX	68 (SAMPEX) 70 (FAST) 73 (TRACE) 74 (SWAS) 75 (WIRE)^† 81 (RHESSI) 83 (GALEX) 90 (AIM) 91 (IBEX) 93 (NuSTAR) 94 (IRIS) GEMS IXPE PUNCH TRACERS
UNEX/MO/I	HETE-1^† 72 (SNOE) 76 (TERRIERS)^† 79 (HETE-2) INTEGRAL 82 (CHIPSat) CINDI Suzaku TWINS Hitomi^† NICER GOLD GUSTO XRISM AWE SunRISE CASE

Proposals

Proposals	FINESSE Arcus OHMIC ASTRE EXCEDE

Green titles indicates active current missions
Grey titles indicates cancelled missions
Italics indicate missions yet to launch
Symbol ^† indicates failure en route or before intended mission data returned

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