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Phobos (moon): Characters, Physical characteristics & Orbital characteristics

Phobos (/ˈfoʊboʊs/) is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. Phobos is named after the Greek god of fear and panic, who is the twin brother of Deimos and son of Ares (Mars).

Language: English [EN]
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Phobos (moon) topic overview

The analysis highlights Characters, Physical characteristics and Orbital characteristics as prominent areas in the source structure around Phobos (moon).

Related topics
153
Source areas
6
Connected nodes
159
Extracted relationships
31
Concept neighborhoods
47
Bridge connections
159

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Exploration · 61 topics
Overview · 26 topics
Physical characteristics · 22 topics
Orbital characteristics · 16 topics
Origin · 16 topics
Discovery and etymology · 12 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

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

Adjectives
Phobian /ˈfoʊbiən/
Albedo
0.071 ± 0.012 at 0.54 μm
Apoapsis
9,517.58 km
Apparent magnitude
11.8
Average orbital speed
2.138 km/s
Axial tilt
0°

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Discovery and etymology

Physical characteristics

Orbital characteristics

Origin

Exploration

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.

How Phobos (moon) connects Entity context

The extracted context around Phobos (moon) shows recurring relationship patterns in the source. For example, Phobos (moon) → Phobian /ˈfoʊbiən/ Another extracted example is Phobos (moon) → 0.071 ± 0.012 at 0.54 μm. Use these groups to spot repeated connection types before inspecting the individual relationships.

Phobos (moon)

Top relations

Adjectives · 1
Phobos (moon) → Phobian /ˈfoʊbiən/
Albedo · 1
Phobos (moon) → 0.071 ± 0.012 at 0.54 μm
Apoapsis · 1
Phobos (moon) → 9,517.58 km
Apparent magnitude · 1
Phobos (moon) → 11.8
Average orbital speed · 1
Phobos (moon) → 2.138 km/s
Axial tilt · 1
Phobos (moon) → 0°
Designation · 1
Phobos (moon) → Mars I
Dimensions · 1
Phobos (moon) → 25.90 km × 22.60 km × 18.32 km (± 0.08 km × 0.08 km × 0.06 km)
Discovered by · 1
Phobos (moon) → Asaph Hall
Discovery date · 1
Phobos (moon) → 18 August 1877

Important terminology

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

Important terminology

phobos mars surface mission deimos orbit martian space would moon stickney km could grooves mi proposed tidal return moons crater

Phobos (moon) relationships Subject–Predicate–Object triples

TTTA extracted 31 structured relationships around Phobos (moon). Examples in this analysis include Phobos (moon) → Adjectives → Phobian /ˈfoʊbiən/ and Phobos (moon) → Albedo → 0.071 ± 0.012 at 0.54 μm. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Phobos (moon)AdjectivesPhobian /ˈfoʊbiən/1.00infobox
Phobos (moon)Albedo0.071 ± 0.012 at 0.54 μm1.00infobox
Phobos (moon)Apoapsis9,517.58 km1.00infobox
Phobos (moon)Apparent magnitude11.81.00infobox
Phobos (moon)Average orbital speed2.138 km/s1.00infobox
Phobos (moon)Axial tilt0°1.00infobox
Phobos (moon)DesignationMars I1.00infobox
Phobos (moon)Dimensions25.90 km × 22.60 km × 18.32 km (± 0.08 km × 0.08 km × 0.06 km)1.00infobox
Phobos (moon)Discovered byAsaph Hall1.00infobox
Phobos (moon)Discovery date18 August 18771.00infobox
Phobos (moon)Eccentricity0.01511.00infobox
Phobos (moon)Equatorial rotation velocity11.0 km/h (6.8 mph) (at longest axis)1.00infobox
Phobos (moon)Escape velocity11.39 m/s (41 km/h)1.00infobox
Phobos (moon)Inclination1.093° (to Mars's equator) 0.046° (to local Laplace plane) 26.04° (to the ecliptic)1.00infobox
Phobos (moon)Mass1.0638×1016 kg (3 σ)1.00infobox
Phobos (moon)Mean density1.861±0.011 g/cm31.00infobox
Phobos (moon)Mean radius11.08±0.04 km1.00infobox
Phobos (moon)Named afterΦόβος1.00infobox
Phobos (moon)Orbital period (sidereal)0.31891023 d (7 h 39 m 12 s)1.00infobox
Phobos (moon)Periapsis9,234.42 km1.00infobox
Phobos (moon)Pronunciation/ˈfoʊbɒs/ or /ˈfoʊbəs/1.00infobox
Phobos (moon)Satellite ofMars1.00infobox
Phobos (moon)Semi-major axis9,376 km (2.76 Mars radii/1.472 Earth radii)1.00infobox
Phobos (moon)Surface area1,640±8 km21.00infobox
Phobos (moon)Surface gravity0.0057 m/s2 (581.4 μ g)1.00infobox
Phobos (moon)Symbol(rare)1.00infobox
Phobos (moon)Synodic rotation periodSynchronous1.00infobox
Phobos (moon)Temperature≈ 233 K1.00infobox
Phobos (moon)Volume5,695±32 km31.00infobox

Related concept clusters Concept neighborhoods

The concept neighborhoods around Phobos (moon) bring nearby vocabulary together. In this analysis, examples include Mission, Orbit and Proposed. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Phobos (moon)
    • Mission
    • Orbit
    • Proposed
    • Surface
    • Could
    • Space
    • Would
    • Gravity
    • Solar
    • Moon
    • Phobos
    • System
  • phobos (moon)
    • Material
    • Origin
    • Mission
    • Due
    • Surface
    • Orbit
    • Proposed
    • Solar
    • Stickney
    • Could
    • Space
    • Would
  • natural satellites of mars
    • Phobos
    • Orbit
    • Surface
    • Mission
    • Space
    • Body
    • Km
    • Deimos
    • Would
    • Around
    • Gravity
    • Material
  • deimos
    • Phobos
    • Mission
    • Solar
    • Proposed
    • Mars
    • Would
    • Density
    • Mars's
    • Named
    • Return
    • Orbit
    • Also
  • primary body
    • Km
    • Orbital
    • Tidal
    • Moons
    • Origin
    • Mars
    • Proposed
    • Moon
    • Space
    • Also
    • Density
    • Known
  • mars
    • Phobos
    • Orbit
    • Surface
    • Mission
    • Space
    • Body
    • Km
    • Deimos
    • Would
    • Around
    • Gravity
    • Material
  • mars reconnaissance orbiter
    • Phobos
    • Orbit
    • Surface
    • Mission
    • Space
    • Body
    • Km
    • Deimos
    • Would
    • Around
    • Gravity
    • Material
  • mars express
    • Phobos
    • Orbit
    • Surface
    • Mission
    • Space
    • Body
    • Km
    • Deimos
    • Would
    • Around
    • Gravity
    • Material

Connections between topic areas Semantic bridges

For Phobos (moon), one of the stronger structural bridges in this analysis connects Phobos (moon) with Exploration. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
Phobos (moon) — Exploration · splits 98 ⟂ 62
Phobos (moon) — Overview · splits 133 ⟂ 27
Phobos (moon) — Physical characteristics · splits 137 ⟂ 23
Phobos (moon) — Orbital characteristics · splits 143 ⟂ 17
Phobos (moon) — Origin · splits 143 ⟂ 17
Phobos (moon) — Discovery and etymology · splits 147 ⟂ 13

Map overview Semantic statistics

Phobos (moon)

Nodes160
Edges159
Triples31
Avg. degree1.99
Density0.0125
Components1

Source & methodology

TTTA analyzes the structure around Phobos (moon) to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Characters, Physical characteristics & Orbital characteristics, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Phobos (moon) · EN edition · Analysis: TopicsToTalkAbout

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