Phoenix lander
E417568
The Phoenix lander was a NASA spacecraft that successfully touched down in Mars’ polar region in 2008 to study the planet’s water ice and soil chemistry in search of habitable conditions.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Phoenix lander canonical | 2 |
| Mars Phoenix Lander mission | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4140272 — 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: Phoenix lander Context triple: [Mars Exploration Program, notableMission, Phoenix lander]
-
A.
InSight Mars lander
The InSight Mars lander was a NASA robotic mission designed to study the interior structure and seismic activity of Mars to better understand the formation and evolution of rocky planets.
-
B.
Mars Pathfinder
Mars Pathfinder was a NASA mission that successfully landed a stationary base and the Sojourner rover on Mars in 1997, demonstrating innovative low-cost technologies for planetary exploration.
-
C.
Spirit rover
Spirit rover was a NASA robotic exploration vehicle that conducted geological studies on the surface of Mars as part of the Mars Exploration Rover mission.
-
D.
Rover Environmental Monitoring Station
The Rover Environmental Monitoring Station is a weather and climate instrument suite aboard NASA’s Curiosity Mars rover that measures atmospheric conditions such as temperature, pressure, humidity, wind, and radiation on the Martian surface.
-
E.
Moon Impact Probe
The Moon Impact Probe was a small Indian lunar probe designed to detach from the Chandrayaan-1 spacecraft and intentionally crash onto the Moon’s surface to conduct scientific measurements and demonstrate landing technologies.
- 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: Phoenix lander Target entity description: The Phoenix lander was a NASA spacecraft that successfully touched down in Mars’ polar region in 2008 to study the planet’s water ice and soil chemistry in search of habitable conditions.
-
A.
InSight Mars lander
The InSight Mars lander was a NASA robotic mission designed to study the interior structure and seismic activity of Mars to better understand the formation and evolution of rocky planets.
-
B.
Mars Pathfinder
Mars Pathfinder was a NASA mission that successfully landed a stationary base and the Sojourner rover on Mars in 1997, demonstrating innovative low-cost technologies for planetary exploration.
-
C.
Spirit rover
Spirit rover was a NASA robotic exploration vehicle that conducted geological studies on the surface of Mars as part of the Mars Exploration Rover mission.
-
D.
Rover Environmental Monitoring Station
The Rover Environmental Monitoring Station is a weather and climate instrument suite aboard NASA’s Curiosity Mars rover that measures atmospheric conditions such as temperature, pressure, humidity, wind, and radiation on the Martian surface.
-
E.
Moon Impact Probe
The Moon Impact Probe was a small Indian lunar probe designed to detach from the Chandrayaan-1 spacecraft and intentionally crash onto the Moon’s surface to conduct scientific measurements and demonstrate landing technologies.
- F. None of above. chosen
Statements (62)
| Predicate | Object |
|---|---|
| instanceOf |
Mars lander
ⓘ
NASA spacecraft ⓘ robotic space probe ⓘ |
| causeOfMissionEnd | onset of Martian winter and lack of solar power ⓘ |
| communicationLost | 2008-11-02 ⓘ |
| communicationSystem | X-band radio ⓘ |
| confirmed | presence of water ice at its landing site ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| destination | Mars ⓘ |
| detected | perchlorate salts in Martian soil ⓘ |
| discovered | water ice in the Martian subsurface ⓘ |
| endOfMission | 2008-11-02 ⓘ |
| found |
alkaline Martian soil
ⓘ
soil containing magnesium, sodium, potassium, and chloride ions ⓘ soil with pH around 8 to 9 ⓘ |
| heritage | based on Mars Surveyor 2001 Lander design ⓘ |
| landingCoordinates | approximately 68.22°N 234.25°E ⓘ |
| landingDate | 2008-05-25 ⓘ |
| landingRegion | north polar region of Mars ⓘ |
| landingSite |
Utopia Planitia
ⓘ
surface form:
Vastitas Borealis
|
| launchDate | 2007-08-04 ⓘ |
| launchSite | Cape Canaveral Air Force Station Space Launch Complex 17A ⓘ |
| launchVehicle |
Delta II
ⓘ
surface form:
Delta II 7925
|
| manufacturer |
Lockheed Martin Space
ⓘ
surface form:
Lockheed Martin Space Systems
|
| massAtLaunch | about 664 kilograms ⓘ |
| massOnMars | about 350 kilograms ⓘ |
| missionDurationAchieved | about 157 sols ⓘ |
| missionDurationPlanned | 90 sols ⓘ |
| missionObjective |
analyze Martian soil chemistry
ⓘ
characterize the history of water in the Martian arctic ⓘ search for habitable conditions on Mars ⓘ study Martian climate and weather at the landing site ⓘ study Martian water ice ⓘ |
| missionResult |
constrained habitability of Martian near-surface environment
ⓘ
improved understanding of Martian arctic climate ⓘ provided first direct observations of Martian water ice by a lander ⓘ |
| missionType |
Mars surface mission
ⓘ
in-situ resource investigation mission ⓘ planetary science mission ⓘ |
| namedAfter | mythological Phoenix bird symbolizing rebirth ⓘ |
| notableEvent | first successful landing in Martian polar region ⓘ |
| operator |
Jet Propulsion Laboratory
ⓘ
NASA ⓘ |
| powerSource | solar panels ⓘ |
| principalInvestigator | Peter H. Smith ⓘ |
| program | NASA Scout Program ⓘ |
| projectManagement | Jet Propulsion Laboratory ⓘ |
| relatedMission |
Mars Odyssey
NERFINISHED
ⓘ
Mars Reconnaissance Orbiter NERFINISHED ⓘ |
| spaceAgency | NASA ⓘ |
| status | inactive on Mars surface ⓘ |
| targetBody | Mars ⓘ |
| usedFor | entry, descent, and landing technology demonstration in polar terrain ⓘ |
| usedInstrument |
Lidar
ⓘ
MECA wet chemistry lab ⓘ Meteorological Station ⓘ Microscopy, Electrochemistry, and Conductivity Analyzer ⓘ Robotic Arm ⓘ Robotic Arm Camera ⓘ Surface Stereo Imager ⓘ TEGA ovens ⓘ SAM gas chromatograph ⓘ
surface form:
Thermal and Evolved Gas Analyzer
|
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: Phoenix lander Description of subject: The Phoenix lander was a NASA spacecraft that successfully touched down in Mars’ polar region in 2008 to study the planet’s water ice and soil chemistry in search of habitable conditions.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
University of Arizona
this entity surface form:
Mars Phoenix Lander mission