Sun-synchronous orbit
E259991
A Sun-synchronous orbit is a near-polar, low Earth orbit in which a satellite passes over any given point of the planet’s surface at the same local solar time, providing consistent lighting conditions for imaging and observation.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Sun-synchronous orbit canonical | 20 |
| Sun-synch orbit | 1 |
| Sun-synchronous LEO | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2372843 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Sun-synchronous orbit Context triple: [NEOSSat, orbitType, Sun-synchronous orbit]
-
A.
low Earth orbit
Low Earth orbit is the region of space relatively close to Earth’s surface, commonly used for satellites, space stations, and crewed missions due to its lower altitude and easier access.
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B.
Orbit
Orbit is a publishing imprint best known for releasing science fiction and fantasy books.
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C.
Orbit
Orbit is the fuzzy green alien mascot of the Houston Astros, known for his playful antics and fan-friendly entertainment at the team’s baseball games.
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D.
Sun–Earth L1 Lagrange point
The Sun–Earth L1 Lagrange point is a gravitationally stable location between the Earth and the Sun where spacecraft can maintain a relatively fixed position with minimal fuel, ideal for continuous solar and space weather observations.
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E.
Sun–Earth L2
Sun–Earth L2 is a gravitationally stable point in space located beyond Earth's orbit where the combined gravity of the Sun and Earth allows spacecraft, such as the James Webb Space Telescope, to maintain a relatively constant position with minimal fuel use.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Sun-synchronous orbit Target entity description: A Sun-synchronous orbit is a near-polar, low Earth orbit in which a satellite passes over any given point of the planet’s surface at the same local solar time, providing consistent lighting conditions for imaging and observation.
-
A.
low Earth orbit
Low Earth orbit is the region of space relatively close to Earth’s surface, commonly used for satellites, space stations, and crewed missions due to its lower altitude and easier access.
-
B.
Orbit
Orbit is a publishing imprint best known for releasing science fiction and fantasy books.
-
C.
Orbit
Orbit is the fuzzy green alien mascot of the Houston Astros, known for his playful antics and fan-friendly entertainment at the team’s baseball games.
-
D.
Sun–Earth L1 Lagrange point
The Sun–Earth L1 Lagrange point is a gravitationally stable location between the Earth and the Sun where spacecraft can maintain a relatively fixed position with minimal fuel, ideal for continuous solar and space weather observations.
-
E.
Sun–Earth L2
Sun–Earth L2 is a gravitationally stable point in space located beyond Earth's orbit where the combined gravity of the Sun and Earth allows spacecraft, such as the James Webb Space Telescope, to maintain a relatively constant position with minimal fuel use.
- F. None of above. chosen
Statements (58)
| Predicate | Object |
|---|---|
| instanceOf |
geocentric orbit
ⓘ
heliosynchronous orbit ⓘ low Earth orbit ⓘ near-polar orbit ⓘ |
| alsoKnownAs |
SSO
ⓘ
Sun-synch orbit ⓘ
linked to:
Sun-synchronous orbit
Sun-synchronous LEO ⓘ
linked to:
Sun-synchronous orbit
heliosynchronous orbit ⓘ |
| hasAdvantage |
consistent Sun elevation angle for images
ⓘ
good global coverage over time ⓘ predictable lighting conditions ⓘ simplified comparison of multi-temporal imagery ⓘ |
| hasAltitudeRange | approximately 500 to 1,000 kilometers ⓘ |
| hasDisadvantage |
higher inclination increases launch energy compared to equatorial LEO
ⓘ
limited revisit time for a single satellite ⓘ requires specific inclination and altitude combination ⓘ |
| hasKeyProperty |
orbit is retrograde
ⓘ
orbital plane precesses about 1 degree per day ⓘ precession of orbital plane matches apparent motion of the Sun ⓘ provides consistent lighting conditions for imaging ⓘ satellite passes over any given point at the same local solar time ⓘ |
| hasNodalPrecessionRate | approximately 360 degrees per year ⓘ |
| hasOrbitalPeriod | approximately 90 to 105 minutes ⓘ |
| hasTypicalAltitude | approximately 600 to 800 kilometers ⓘ |
| hasTypicalEccentricity |
low eccentricity
ⓘ
near-circular orbit ⓘ |
| hasTypicalInclination | approximately 96 to 99 degrees ⓘ |
| hasTypicalLocalTimeOfDescendingNode |
about 10:30 a.m. for many Earth observation missions
ⓘ
about 1:30 p.m. for some missions ⓘ |
| isCharacterizedBy |
fixed local solar time of ascending or descending node
ⓘ
ground track that shifts westward each orbit ⓘ near-polar inclination ⓘ regression of nodes due to Earth’s oblateness ⓘ |
| isDesignedFor |
Earth observation
ⓘ
cartography ⓘ climate research ⓘ disaster monitoring ⓘ environmental monitoring ⓘ land use monitoring ⓘ meteorological satellites ⓘ optical imaging ⓘ radar imaging ⓘ remote sensing ⓘ |
| isSubClassOf |
low Earth orbit
ⓘ
polar orbit ⓘ |
| isUsedBy |
Aqua satellite
ⓘ
ICESat-2 satellite ⓘ
linked to:
ICESat missions
Landsat satellites ⓘ SPOT satellites ⓘ
linked to:
SPOT Earth observation satellites
Sentinel Earth observation satellites ⓘ
linked to:
Sentinel satellites
Terra satellite ⓘ many weather and environmental satellites ⓘ |
| isUsedFor |
monitoring seasonal changes on Earth
ⓘ
multi-spectral imaging ⓘ synthetic aperture radar imaging ⓘ |
| requiresCondition |
nodal precession rate equals Earth’s mean motion around the Sun
ⓘ
specific combination of altitude and inclination to achieve Sun-synchronicity ⓘ |
| usesEarthOblateness | J2 perturbation causes nodal precession ⓘ |
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: Sun-synchronous orbit Description of subject: A Sun-synchronous orbit is a near-polar, low Earth orbit in which a satellite passes over any given point of the planet’s surface at the same local solar time, providing consistent lighting conditions for imaging and observation.
Referenced by (22)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Sun-synchronous orbit
linked to: Sun-synchronous orbit
subject linked to:
Akari (infrared satellite)