LightSail 2
E221846
LightSail 2 is a small experimental spacecraft developed by The Planetary Society to demonstrate controlled solar sail propulsion in Earth orbit.
All labels observed (2)
| Label | Occurrences |
|---|---|
| LightSail 2 canonical | 3 |
| LightSail 1 | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T1979742 — 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: LightSail 2 Context triple: [STP-2, notablePayload, LightSail 2]
-
A.
Earthlight
Earthlight is a science fiction novel by Arthur C. Clarke that explores political tension and scientific discovery in a future human civilization spread across the Moon and the Solar System.
-
B.
Helios 2
Helios 2 was a German–French military reconnaissance satellite launched during the Cold War to provide high-resolution imaging intelligence from orbit.
-
C.
Cygnus spacecraft
The Cygnus spacecraft is an uncrewed commercial cargo vehicle developed by Northrop Grumman to deliver supplies and scientific equipment to the International Space Station.
-
D.
Orion spacecraft
The Orion spacecraft is NASA’s next-generation crewed space vehicle designed to carry astronauts beyond low Earth orbit on deep-space missions, including journeys to the Moon and eventually Mars.
-
E.
The Centaurus
The Centaurus is a prominent mixed-use complex in Islamabad, Pakistan, featuring high-rise towers that house a shopping mall, residential apartments, offices, and a hotel.
- 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: LightSail 2 Target entity description: LightSail 2 is a small experimental spacecraft developed by The Planetary Society to demonstrate controlled solar sail propulsion in Earth orbit.
-
A.
Earthlight
Earthlight is a science fiction novel by Arthur C. Clarke that explores political tension and scientific discovery in a future human civilization spread across the Moon and the Solar System.
-
B.
Helios 2
Helios 2 was a German–French military reconnaissance satellite launched during the Cold War to provide high-resolution imaging intelligence from orbit.
-
C.
Cygnus spacecraft
The Cygnus spacecraft is an uncrewed commercial cargo vehicle developed by Northrop Grumman to deliver supplies and scientific equipment to the International Space Station.
-
D.
Orion spacecraft
The Orion spacecraft is NASA’s next-generation crewed space vehicle designed to carry astronauts beyond low Earth orbit on deep-space missions, including journeys to the Moon and eventually Mars.
-
E.
The Centaurus
The Centaurus is a prominent mixed-use complex in Islamabad, Pakistan, featuring high-rise towers that house a shopping mall, residential apartments, offices, and a hotel.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
CubeSat
ⓘ
solar sail spacecraft ⓘ spacecraft ⓘ |
| attitudeControl |
magnetorquers
ⓘ
reaction wheels ⓘ |
| communicationSystem | radio communications in amateur radio bands ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dataDownlink | telemetry and images transmitted to ground stations ⓘ |
| demonstratedCapability | orbit raising using solar radiation pressure ⓘ |
| deploymentEvent | solar sail deployed in orbit on 2019-07-23 ⓘ |
| developer | The Planetary Society ⓘ |
| engineeringLead | David Bruggeman (among others) ⓘ |
| fundingModel | public donations ⓘ |
| hasImagingSystem | onboard cameras for sail imaging and Earth views ⓘ |
| height | approximately 10 centimeters (stowed) ⓘ |
| inclination | approximately 24 degrees ⓘ |
| launchDate | 2019-06-25 ⓘ |
| launchMass | about 5 kilograms ⓘ |
| launchServiceProvider | SpaceX ⓘ |
| launchSite |
Kennedy Space Center Launch Complex 39A
ⓘ
surface form:
Kennedy Space Center LC-39A
|
| launchVehicle |
Falcon Heavy rocket
ⓘ
surface form:
Falcon Heavy
|
| length | approximately 30 centimeters (stowed) ⓘ |
| massWithSailDeployed | about 5 kilograms ⓘ |
| missionDuration | over 3 years in orbit ⓘ |
| missionStatus | completed ⓘ |
| missionType |
solar sail propulsion demonstration
ⓘ
technology demonstration ⓘ |
| notableAchievement | first small spacecraft to demonstrate controlled solar sailing in Earth orbit ⓘ |
| onboardComputer | CubeSat-class avionics ⓘ |
| operator | The Planetary Society ⓘ |
| orbitPeriod | about 90 minutes ⓘ |
| orbitType | low Earth orbit ⓘ |
| powerSource | solar panels ⓘ |
| precededBy |
LightSail 2
self-linksurface differs
ⓘ
surface form:
LightSail 1
|
| primaryObjective | demonstrate controlled solar sailing in Earth orbit ⓘ |
| program | LightSail program ⓘ |
| projectLeader |
William Sanford Nye
ⓘ
surface form:
Bill Nye (as CEO of The Planetary Society)
|
| projectScientist | Bruce Betts ⓘ |
| reentry | spacecraft reentered Earth’s atmosphere in 2022 ⓘ |
| sailArea | about 32 square meters ⓘ |
| sailConfiguration | square sail with four triangular quadrants ⓘ |
| sailMaterial | Mylar ⓘ |
| scientificOutreach | used for public engagement in space exploration and solar sailing ⓘ |
| spacecraftBus | Prox-1-based 3U CubeSat form factor ⓘ |
| sponsor | crowdfunded by members and donors of The Planetary Society ⓘ |
| usesPropulsion | solar radiation pressure on reflective sail ⓘ |
| width | approximately 10 centimeters (stowed) ⓘ |
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: LightSail 2 Description of subject: LightSail 2 is a small experimental spacecraft developed by The Planetary Society to demonstrate controlled solar sail propulsion in Earth orbit.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
LightSail 1
this entity surface form:
LightSail 1