Luna 4
Luna 4, or E-6 No.4 (Ye-6 series), sometimes known in the West as Sputnik 26, was a Soviet spacecraft launched as part of the Luna program to attempt the first soft landing on the Moon. Following a successful launch, the spacecraft failed to perform a course correction and as a result it missed the Moon, remaining instead in Earth orbit.
| Mission type | Lunar lander |
|---|---|
| Operator | Soviet Union |
| COSPAR ID | 1963-008B |
| SATCAT no. | 566 |
| Mission duration | 12 days (launch to last contact) |
| Spacecraft properties | |
| Spacecraft | Ye-6 No.4 |
| Manufacturer | OKB-1 |
| Launch mass | 1,422 kilograms (3,135 lb) |
| Start of mission | |
| Launch date | April 2, 1963, 08:04:00 UTC |
| Rocket | Molniya-L 8K78/E6 |
| Launch site | Baikonur 1/5 |
| End of mission | |
| Last contact | April 14, 1963 |
| Orbital parameters | |
| Reference system | Barycentric (Earth-Moon system) |
| Semi-major axis | 394,128 kilometres (244,900 mi) |
| Eccentricity | 0.772 |
| Periapsis altitude | 199 kilometres (124 mi) |
| Apoapsis altitude | 694,000 kilometres (431,000 mi) |
| Inclination | 65.0 degrees |
| Period | 24.21 days |
| Epoch | April 2, 1963 |
| Lunar flyby (failed landing) | |
| Closest approach | April 6, 1963, 1:24 UT |
| Distance | 8,336.2 kilometres (5,179.9 mi) |
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