Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Luna 4

Luna 4, or E-6 No.4 (Ye-6 series), sometimes known in the West as Lunik 4, was a Soviet spacecraft launched in 1963 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 before…

Art, Background & Mission

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Luna 4. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Apoapsis altitude
89,250 km (55,460 mi)
Closest approach
April 5, 1963, 13:25 UT
COSPAR ID
1963-008B
Distance
8,400 kilometres (5,200 mi)
Epoch
April 2, 1963
Last contact
April 15, 1963

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Background

Spacecraft

Mission

Results and status

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Luna 4

Nodes44
Edges43
Triples58
Avg. degree1.95
Density0.045455
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Luna 4

Top relations

related to Mission · 16
Luna 4 → After, April, Baikonur Cosmodrome, December, February, January, Launch, Launches, LEO, Luna, Luna E-6 No, Molniya-L, Simferopol, Site, UTC, Ye-6
related to Results and status · 15
Luna 4 → April, Because Luna, Earth, Earth's, February, French, Italian, Luna, MHz, Moon, Russia, Sun, The, The Ye-6, Though Luna
related to Spacecraft · 10
Luna 4 → I-100, Isayev, Luna, Mars, Molniya, SAN, The, The Ye-6, This, Venera
Apoapsis altitude · 1
Luna 4 → 89,250 km (55,460 mi)
Closest approach · 1
Luna 4 → April 5, 1963, 13:25 UT
COSPAR ID · 1
Luna 4 → 1963-008B
Distance · 1
Luna 4 → 8,400 kilometres (5,200 mi)
Epoch · 1
Luna 4 → April 2, 1963
Last contact · 1
Luna 4 → April 15, 1963
Launch date · 1
Luna 4 → April 2, 1963, 08:04:00 (1963-04-02UTC08:04Z) UTC

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

luna spacecraft moon mission ye-6 landing lander would program first orbit lunar soviet mi launch ft control launched 1963 successful

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Luna 4Apoapsis altitude89,250 km (55,460 mi)1.00infobox
Luna 4Closest approachApril 5, 1963, 13:25 UT1.00infobox
Luna 4COSPAR ID1963-008B1.00infobox
Luna 4Distance8,400 kilometres (5,200 mi)1.00infobox
Luna 4EpochApril 2, 19631.00infobox
Luna 4Last contactApril 15, 19631.00infobox
Luna 4Launch dateApril 2, 1963, 08:04:00 (1963-04-02UTC08:04Z) UTC1.00infobox
Luna 4Launch mass1,422 kilograms (3,135 lb)1.00infobox
Luna 4Launch siteBaikonur 1/51.00infobox
Luna 4ManufacturerOKB-11.00infobox
Luna 4Mission duration13 days (launch to last contact)1.00infobox
Luna 4Mission typeLunar lander1.00infobox
Luna 4OperatorSoviet space program1.00infobox
Luna 4Periapsis altitude690,000 km (430,000 mi)1.00infobox
Luna 4RocketMolniya-L 8K78/E61.00infobox
Luna 4SATCAT no.5661.00infobox
Luna 4SpacecraftYe-6 No.41.00infobox

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.