Research any topic before you write.

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

87 Sylvia: Characters & Measurement

87 Sylvia is one of the largest asteroids (approximately tied for 7th place, to within measurement uncertainties). It is the parent body of the Sylvia family and member of Cybele group located beyond the main asteroid belt (see minor-planet groups). Sylvia was the first asteroid known to possess more than one moon.

Language: English [EN]
Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.
100%
More settings
100% 100% 100% 100% 100%

87 Sylvia topic overview

The analysis highlights Characters and Measurement as prominent areas in the source structure around 87 Sylvia.

Related topics
26
Source areas
4
Connected nodes
30
Extracted relationships
83
Concept neighborhoods
15
Bridge connections
30

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.

Satellite system · 12 topics
Discovery and naming · 9 topics
Overview · 4 topics
Physical characteristics · 1 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.

Absolute magnitude (H)
6.94
Adjectives
Sylvian (/ˈsɪlviən/ SIL-vee-ən)
Alternative designations
A909 GA
Aphelion
3.81 AU (560 million km)
Argument of perihelion
263°
Average orbital speed
15.94 km/s[citation needed]

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 naming

Physical characteristics

Satellite system

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 87 Sylvia connects Entity context

The extracted context around 87 Sylvia shows recurring relationship patterns in the source. For example, 87 Sylvia → AstDyS-2, Asteroidal Satellite, Asteroids, August, Data, December, Discovery, Dubreuil, Dynamic SiteEphemeris, Ephemeris, ESO, First, Frappa, Her Twins, Includes, Instability, January, Johnston, Johnston's, JPL Small-Body DatabaseClose Another extracted example is 87 Sylvia → 6.94. Use these groups to spot repeated connection types before inspecting the individual relationships.

87 Sylvia

Top relations

related to External links · 51
87 Sylvia → AstDyS-2, Asteroidal Satellite, Asteroids, August, Data, December, Discovery, Dubreuil, Dynamic SiteEphemeris, Ephemeris, ESO, First, Frappa, Her Twins, Includes, Instability, January, Johnston, Johnston's, JPL Small-Body DatabaseClose
Absolute magnitude (H) · 1
87 Sylvia → 6.94
Adjectives · 1
87 Sylvia → Sylvian (/ˈsɪlviən/ SIL-vee-ən)
Alternative designations · 1
87 Sylvia → A909 GA
Aphelion · 1
87 Sylvia → 3.81 AU (560 million km)
Argument of perihelion · 1
87 Sylvia → 263°
Average orbital speed · 1
87 Sylvia → 15.94 km/s[citation needed]
Dimensions · 1
87 Sylvia → (363 × 249 × 191) ±5 km (MPCD) or (374 × 248 × 194) ±5 km (ADAM)
Discovered by · 1
87 Sylvia → Norman Robert Pogson
Discovery date · 1
87 Sylvia → 16 May 1866

Important terminology

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

Important terminology

sylvia discovery 87 asteroid romulus discovered satellites remus asteroids first pogson minor orbital main belt moon 1866 one cybele satellite

87 Sylvia relationships Subject–Predicate–Object triples

TTTA extracted 83 structured relationships around 87 Sylvia. Examples in this analysis include 87 Sylvia → Absolute magnitude (H) → 6.94 and 87 Sylvia → Adjectives → Sylvian (/ˈsɪlviən/ SIL-vee-ən). The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
87 SylviaAbsolute magnitude (H)6.941.00infobox
87 SylviaAdjectivesSylvian (/ˈsɪlviən/ SIL-vee-ən)1.00infobox
87 SylviaAlternative designationsA909 GA1.00infobox
87 SylviaAphelion3.81 AU (560 million km)1.00infobox
87 SylviaArgument of perihelion263°1.00infobox
87 SylviaAverage orbital speed15.94 km/s[citation needed]1.00infobox
87 SylviaDimensions(363 × 249 × 191) ±5 km (MPCD) or (374 × 248 × 194) ±5 km (ADAM)1.00infobox
87 SylviaDiscovered byNorman Robert Pogson1.00infobox
87 SylviaDiscovery date16 May 18661.00infobox
87 SylviaEccentricity0.0941.00infobox
87 SylviaGeometric albedo0.04351.00infobox
87 SylviaInclination10.9°1.00infobox
87 SylviaKnown satellites21.00infobox
87 SylviaLongitude of ascending node73°1.00infobox
87 SylviaMass(14.76±0.06)×1018 kg (14.6±0.1)×1018 kg1.00infobox
87 SylviaMean anomaly213°1.00infobox
87 SylviaMean density1.378±0.045 g/cm31.00infobox
87 SylviaMean diameter271±5 km (MPCD) or 274±5 km (ADAM)1.00infobox
87 SylviaMean motion0° 9m 6.48s / day1.00infobox
87 SylviaMinor planet categorymain belt · (outside core) Sylvia · Cybele1.00infobox
87 SylviaNamed afterRhea Silvia1.00infobox
87 SylviaNorth pole declination+83.5°±5°1.00infobox
87 SylviaNorth pole right ascension14.3°±5°1.00infobox
87 SylviaOrbital period (sidereal)6.5 a (2372 d)1.00infobox
87 SylviaPerihelion3.15 AU (480 million km)1.00infobox
87 SylviaPole ecliptic latitude+64.2°±5°1.00infobox
87 SylviaPole ecliptic longitude75.3°±5°1.00infobox
87 SylviaPronunciation/ˈsɪlviə/ SIL-vee-ə1.00infobox
87 SylviaSemi-major axis3.48 AU (520 million km)1.00infobox
87 SylviaSpectral typeX1.00infobox

Related concept clusters Concept neighborhoods

The concept neighborhoods around 87 Sylvia bring nearby vocabulary together. In this analysis, examples include System, Satellites and Romulus. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • cybele group
    • See
    • Main
    • References
    • Albedo
    • Axis
    • Image
    • Km
    • Known
    • Named
    • Naming
    • Physical
    • Volume
  • main asteroid belt
    • Main
    • Body
    • Cybele
    • See
    • Satellite
    • System
    • References
    • Albedo
    • Axis
    • First
    • Image
    • Km
  • albedo
    • References
    • Axis
    • Body
    • Cybele
    • Image
    • Km
    • Known
    • Named
    • Naming
    • Physical
    • See
    • Volume
  • discovery and naming
    • References
    • Satellites
    • Image
    • Km
    • Named
    • Naming
    • Physical
    • See
    • Volume
    • Density
    • Moons
    • Planet
  • n. r. pogson
    • Rhea
    • Silvia
    • References
    • See
    • Volume
    • Planet
    • Satellite
    • System
    • Remus
    • Romulus
    • Satellites
    • Sylvia
  • physical characteristics
    • Orbital
    • References
    • See
    • Volume
    • Planet
    • Rhea
    • Satellite
    • Silvia
    • System
    • Pogson
    • Satellites
    • Sylvia
  • satellite system
    • System
    • Planet
    • References
    • See
    • Volume
    • Sylvia
    • Rhea
    • Silvia
    • Pogson
    • Romulus
    • Satellites
  • rhea silvia
    • Silvia
    • Remus
    • Romulus
    • See
    • Volume
    • Planet
    • Satellite
    • System
    • Satellites
    • Sylvia

Connections between topic areas Semantic bridges

For 87 Sylvia, one of the stronger structural bridges in this analysis connects 87 Sylvia with Satellite system. 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
87 Sylvia — Satellite system · splits 18 ⟂ 13
87 Sylvia — Discovery and naming · splits 21 ⟂ 10
87 Sylvia — Overview · splits 26 ⟂ 5

Map overview Semantic statistics

87 Sylvia

Nodes31
Edges30
Triples83
Avg. degree1.94
Density0.064516
Components1

Source & methodology

TTTA analyzes the structure around 87 Sylvia to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Characters & Measurement, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — 87 Sylvia · EN edition · Analysis: TopicsToTalkAbout

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