Molniya orbit
E529484
A Molniya orbit is a highly elliptical, high-inclination Earth orbit designed to provide long-duration coverage over high latitudes, particularly useful for communications and observation of polar regions.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Molniya orbit canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T5595761 — 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: Molniya orbit Context triple: [Molniya-M, typicalOrbit, Molniya orbit]
-
A.
Clarke orbit
A Clarke orbit is a geostationary orbit directly above Earth's equator where a satellite appears fixed over one point on the surface, enabling continuous communication coverage.
-
B.
Sun-synchronous orbit
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.
-
C.
Earth-trailing orbit (STEREO-B)
Earth-trailing orbit (STEREO-B) is the heliocentric path followed by NASA’s STEREO-B spacecraft as it slowly lags behind Earth to provide a unique vantage point for stereoscopic observations of the Sun.
-
D.
Lissajous orbit
A Lissajous orbit is a stable, looping three-dimensional trajectory around a Lagrange point, commonly used by space observatories to maintain a relatively constant position with respect to Earth and the Sun.
-
E.
Mars orbit
Mars orbit is the elliptical path around the planet Mars followed by natural satellites and spacecraft such as Tianwen-1.
- 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: Molniya orbit Target entity description: A Molniya orbit is a highly elliptical, high-inclination Earth orbit designed to provide long-duration coverage over high latitudes, particularly useful for communications and observation of polar regions.
-
A.
Clarke orbit
A Clarke orbit is a geostationary orbit directly above Earth's equator where a satellite appears fixed over one point on the surface, enabling continuous communication coverage.
-
B.
Sun-synchronous orbit
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.
-
C.
Earth-trailing orbit (STEREO-B)
Earth-trailing orbit (STEREO-B) is the heliocentric path followed by NASA’s STEREO-B spacecraft as it slowly lags behind Earth to provide a unique vantage point for stereoscopic observations of the Sun.
-
D.
Lissajous orbit
A Lissajous orbit is a stable, looping three-dimensional trajectory around a Lagrange point, commonly used by space observatories to maintain a relatively constant position with respect to Earth and the Sun.
-
E.
Mars orbit
Mars orbit is the elliptical path around the planet Mars followed by natural satellites and spacecraft such as Tianwen-1.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Earth orbit
ⓘ
communications orbit ⓘ highly elliptical orbit ⓘ satellite orbit ⓘ |
| advantageOver | geostationary orbit for high-latitude coverage ⓘ |
| apoapsisLocation | high northern latitudes above Earth ⓘ |
| appliesTo | artificial Earth satellites ⓘ |
| benefit |
high elevation angles over target region
ⓘ
improved link budget for communications ⓘ long visibility periods from ground stations in high latitudes ⓘ reduced atmospheric attenuation at high latitudes ⓘ |
| designedFor |
communications in high-latitude regions
ⓘ
long-duration coverage over high latitudes ⓘ meteorological observation of high latitudes ⓘ military communications ⓘ observation of polar regions ⓘ television broadcasting to high latitudes ⓘ |
| developedBy | Soviet Union ⓘ |
| hasCharacteristic |
argument of perigee near 270 degrees
ⓘ
frozen argument of perigee at critical inclination ⓘ ground track concentrated over high latitudes ⓘ high eccentricity ⓘ high inclination ⓘ long dwell time over northern hemisphere ⓘ short time near perigee over southern hemisphere ⓘ |
| limitationOf | geostationary satellites at high latitudes ⓘ |
| namedAfter |
Soviet Molniya communications satellite program
ⓘ
linked to:
Molniya communications satellites
|
| periapsisLocation | southern hemisphere above Earth ⓘ |
| providesCoverage |
Arctic regions
ⓘ
linked to:
Arctic region
Russian territory at high latitudes ⓘ northern high-latitude regions ⓘ |
| relatedTo |
Tundra orbit
ⓘ
geosynchronous orbit ⓘ |
| requiresConstellationSize |
sometimes 2 satellites for partial coverage
ⓘ
typically 3 satellites for continuous coverage ⓘ |
| requiresStationKeeping | to maintain orbital parameters over time ⓘ |
| stabilityProperty | argument of perigee remains nearly fixed at critical inclination ⓘ |
| typicalApogeeAltitude | about 39,000 kilometers ⓘ |
| typicalEccentricity | high eccentricity ⓘ |
| typicalInclination |
63.3 degrees
ⓘ
63.4 degrees ⓘ |
| typicalOrbitalPeriod |
about 12 hours
ⓘ
half a sidereal day ⓘ |
| typicalPerigeeAltitude | about 500 to 1,000 kilometers ⓘ |
| usedBy |
Russian communications satellites
ⓘ
Soviet communications satellites ⓘ communications satellites for northern Canada ⓘ military early-warning satellites ⓘ |
| usesResonance | 2:1 resonance with Earth rotation ⓘ |
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: Molniya orbit Description of subject: A Molniya orbit is a highly elliptical, high-inclination Earth orbit designed to provide long-duration coverage over high latitudes, particularly useful for communications and observation of polar regions.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.