S/1899 S 1

E257501

S/1899 S 1 is the provisional discovery designation originally assigned to Phoebe, one of Saturn’s irregular outer moons.

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All labels observed (1)

Label Occurrences
S/1899 S 1 canonical 2

Statements (45)

Predicate Object
instanceOf irregular satellite
natural satellite
outer moon
satellite of Saturn
albedo low
alternateName Phoebe
axialTilt_degrees small
belongsToCategory Irregular satellites
Moons of Saturn
Retrograde satellites
belongsToDynamicalClass Phoebe group
belongsToPlanetarySystem Saturnian system
Solar System
density_g_per_cm3 approximately 1.6
discoverer William Henry Pickering
discoveryMethod ground-based telescope observations
discoveryYear 1899
escapeVelocity_m_per_s approximately 100
flybyYear_Cassini 2004
governingNamingAuthority International Astronomical Union
hasCrateredSurface true
hasOfficialName Phoebe
hasRetrogradeOrbit true
hasSpacecraftFlyby Cassini–Huygens
isFirstDiscoveredIrregularMoonOfSaturn true
isProvisionalDiscoveryDesignation true
likelyCapturedObject true
meanDiameter_km approximately 213
meanRadius_km approximately 106.5
namedAfter Phoebe from Greek mythology
notableCrater Jason
orbitalDirection retrograde
orbitalEccentricity approximately 0.163
orbitalInclination_degrees approximately 175
orbitalPeriod_days approximately 550
orbits Saturn
possibleOrigin captured Kuiper belt object or centaur
provisionalDesignationFor Phoebe
rotationPeriod_hours approximately 9.27
satelliteType irregular
semiMajorAxis_km approximately 12952000
shape irregular
spectralType C-type or D-type like
surfaceColor very dark gray
surfaceComposition dark, carbon-rich material

How these facts were elicited

The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.

Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10.

# Requirements
- If you don't know the subject at all, return an empty list.
- If the subject is not a named entity, return an empty list.
- Include at least one triple where predicate is "instanceOf".
- Do not get too wordy.
- Separate several objects into multiple triples with one object.
Input
Subject: S/1899 S 1
Description of subject: S/1899 S 1 is the provisional discovery designation originally assigned to Phoebe, one of Saturn’s irregular outer moons.

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

Phoebe catalogCode S/1899 S 1
Saturn IX alternativeName S/1899 S 1