Sjur Refsdal
E819217
Sjur Refsdal was a Norwegian astrophysicist renowned for pioneering the use of gravitational lensing to measure cosmological parameters such as the Hubble constant.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sjur Refsdal canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9756503 — 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: Sjur Refsdal Context triple: [Svein Rosseland, notableStudent, Sjur Refsdal]
-
A.
Johan P. Olsen
Johan P. Olsen is a prominent Norwegian political scientist known for his influential work on organizational theory and institutionalism, often in collaboration with James G. March.
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B.
Svein Rosseland
Svein Rosseland was a Norwegian astrophysicist renowned for his pioneering work in radiative transfer and stellar structure, for which the Rosseland mean opacity is named.
-
C.
Kjetil Trædal Thorsen
Kjetil Trædal Thorsen is a Norwegian architect best known as a co-founder and leading figure of the international architecture and design firm Snøhetta.
-
D.
Christian M. Ravndal
Christian M. Ravndal was an American diplomat who served as the United States Ambassador to Hungary.
-
E.
Hans Peter Stilling
Hans Peter Stilling was a Danish newspaper publisher best known for establishing the influential regional newspaper The Jutland Post.
- 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: Sjur Refsdal Target entity description: Sjur Refsdal was a Norwegian astrophysicist renowned for pioneering the use of gravitational lensing to measure cosmological parameters such as the Hubble constant.
-
A.
Johan P. Olsen
Johan P. Olsen is a prominent Norwegian political scientist known for his influential work on organizational theory and institutionalism, often in collaboration with James G. March.
-
B.
Svein Rosseland
Svein Rosseland was a Norwegian astrophysicist renowned for his pioneering work in radiative transfer and stellar structure, for which the Rosseland mean opacity is named.
-
C.
Kjetil Trædal Thorsen
Kjetil Trædal Thorsen is a Norwegian architect best known as a co-founder and leading figure of the international architecture and design firm Snøhetta.
-
D.
Christian M. Ravndal
Christian M. Ravndal was an American diplomat who served as the United States Ambassador to Hungary.
-
E.
Hans Peter Stilling
Hans Peter Stilling was a Danish newspaper publisher best known for establishing the influential regional newspaper The Jutland Post.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
Norwegian scientist
ⓘ
astrophysicist ⓘ human ⓘ |
| academicDegree | PhD in astronomy ⓘ |
| citizenship | Norway NERFINISHED ⓘ |
| countryOfCitizenship | Norway ⓘ |
| dateOfBirth | 1935-12-30 ⓘ |
| dateOfDeath | 2009-01-29 ⓘ |
| educatedAt |
Hamburg Observatory
NERFINISHED
ⓘ
University of Oslo NERFINISHED ⓘ |
| employer |
Hamburg Observatory
NERFINISHED
ⓘ
Max Planck Institute for Astrophysics NERFINISHED ⓘ Nordic Institute for Theoretical Physics NERFINISHED ⓘ |
| familyName | Refsdal NERFINISHED ⓘ |
| fieldOfWork |
astrophysics
ⓘ
cosmology ⓘ gravitational lensing ⓘ |
| gender | male ⓘ |
| givenName | Sjur NERFINISHED ⓘ |
| hasWorkNamedAfter |
Refsdal method for Hubble constant determination
NERFINISHED
ⓘ
Refsdal supernova NERFINISHED ⓘ |
| honouredIn | naming of the multiply imaged supernova SN Refsdal ⓘ |
| influenced |
development of gravitational lensing as a cosmological tool
ⓘ
measurements of the Hubble constant via strong lensing ⓘ |
| knownFor | method to determine the Hubble constant using gravitational lensing time delays ⓘ |
| languageOfWorkOrName |
English
ⓘ
Norwegian ⓘ |
| memberOf | Norwegian Academy of Science and Letters NERFINISHED ⓘ |
| name | Sjur Refsdal NERFINISHED ⓘ |
| notableFor |
pioneering the use of gravitational lensing in cosmology
ⓘ
proposing time-delay measurements in gravitationally lensed quasars ⓘ using gravitational lensing to measure cosmological parameters ⓘ |
| notableIdea | using gravitational lensing as a cosmological probe ⓘ |
| placeOfBirth | Oslo NERFINISHED ⓘ |
| placeOfDeath | Hamburg NERFINISHED ⓘ |
| positionHeld | professor of astrophysics ⓘ |
| proposed | using time delays between multiple images in a gravitational lens to measure the Hubble constant ⓘ |
| residence |
Hamburg
NERFINISHED
ⓘ
Oslo NERFINISHED ⓘ |
| significantPublication | 1964 paper on gravitational lensing time delays ⓘ |
| workLocation |
Hamburg
NERFINISHED
ⓘ
Munich NERFINISHED ⓘ Oslo NERFINISHED ⓘ |
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: Sjur Refsdal Description of subject: Sjur Refsdal was a Norwegian astrophysicist renowned for pioneering the use of gravitational lensing to measure cosmological parameters such as the Hubble constant.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.