UGC 668
E514341
UGC 668 is a dwarf irregular galaxy in the Local Group, better known as IC 1613, notable for its relative isolation and use in calibrating the cosmic distance scale.
All labels observed (1)
| Label | Occurrences |
|---|---|
| UGC 668 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5363207 — 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: UGC 668 Context triple: [IC 1613, catalogDesignation, UGC 668]
-
A.
UGC 6669
UGC 6669 is a dwarf galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
-
B.
UGC 6850
UGC 6850 is a dwarf galaxy located in the nearby M81 Group in the constellation Ursa Major.
-
C.
UGC 6456
UGC 6456 is a dwarf irregular galaxy located in the constellation Ursa Major and is a member of the nearby M81 Group of galaxies.
-
D.
UGC 5666
UGC 5666 is a dwarf irregular galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
-
E.
UGC 6549
UGC 6549 is a dwarf galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
- 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: UGC 668 Target entity description: UGC 668 is a dwarf irregular galaxy in the Local Group, better known as IC 1613, notable for its relative isolation and use in calibrating the cosmic distance scale.
-
A.
UGC 6669
UGC 6669 is a dwarf galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
-
B.
UGC 6850
UGC 6850 is a dwarf galaxy located in the nearby M81 Group in the constellation Ursa Major.
-
C.
UGC 6456
UGC 6456 is a dwarf irregular galaxy located in the constellation Ursa Major and is a member of the nearby M81 Group of galaxies.
-
D.
UGC 5666
UGC 5666 is a dwarf irregular galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
-
E.
UGC 6549
UGC 6549 is a dwarf galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf | dwarf irregular galaxy ⓘ |
| absoluteMagnitudeV | about −15.3 ⓘ |
| alsoKnownAs |
Caldwell 51
ⓘ
IC 1613 ⓘ |
| angularSize | about 16.2 × 14.5 arcminutes ⓘ |
| apparentMagnitudeV | about 9.9 ⓘ |
| belongsTo | Local Group dwarf galaxies ⓘ |
| catalog |
Caldwell
ⓘ
IC ⓘ UGC ⓘ |
| catalogNumber |
Caldwell 51
ⓘ
IC 1613 ⓘ UGC 668 ⓘ |
| contains |
Cepheid variable stars
ⓘ
H II regions ⓘ RR Lyrae variable stars ⓘ red giant branch stars ⓘ |
| declination | +02° 07′ 04″ ⓘ |
| discoveredBy | Max Wolf ⓘ |
| discoveryYear | 1906 ⓘ |
| distanceFromEarth |
about 224 kiloparsecs
ⓘ
about 730000 light-years ⓘ |
| galaxyType | Magellanic-type irregular galaxy ⓘ |
| hasNeutralHydrogenMass | on the order of 10^8 solar masses ⓘ |
| hasProperty |
gas-rich
ⓘ
low internal extinction ⓘ low metallicity ⓘ relatively isolated galaxy ⓘ well-resolved stellar population ⓘ |
| hasStarFormation | ongoing ⓘ |
| inclination | about 38 degrees ⓘ |
| locatedInConstellation | Cetus ⓘ |
| memberOf | Local Group ⓘ |
| metallicity | about 1/10 solar ⓘ |
| morphologicalType | IB(s)m ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| positionAngle | about 58 degrees ⓘ |
| radialVelocity | about −234 km/s ⓘ |
| rightAscension | 01h 04m 47s ⓘ |
| stellarMass | on the order of 10^8 solar masses ⓘ |
| usedFor |
Cepheid period–luminosity relation calibration
ⓘ
RR Lyrae distance calibration ⓘ Tip of the Red Giant Branch distance calibration ⓘ calibration of the cosmic distance scale ⓘ studies of stellar evolution in low-metallicity environments ⓘ |
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: UGC 668 Description of subject: UGC 668 is a dwarf irregular galaxy in the Local Group, better known as IC 1613, notable for its relative isolation and use in calibrating the cosmic distance scale.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.