Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 21h 01m 09.20684s[1] |
Declination | +50° 21′ 44.8033″[1] |
Apparent magnitude (V) | 11.99[2] |
Characteristics | |
Spectral type | G7-K0IV[3] |
Astrometry | |
Proper motion (μ) | RA: 0.980[1] mas/yr Dec.: −3.783[1] mas/yr |
Parallax (π) | 1.6760 ± 0.0237 mas[1] |
Distance | 1,950 ± 30 ly (597 ± 8 pc) |
Details[3] | |
Mass | 2.8 M☉ |
Radius | 5 R☉ |
Temperature | 5200 K |
Other designations | |
Database references | |
SIMBAD | data |
V1331 Cygni (also known as V1331 Cyg) is a young star in the constellation Cygnus. V1331 Cyg is located in the dark nebula LDN 981.[4]
V1331 Cygni is most noted for having an arc-like reflection nebula surrounding it. This circumstellar disc is a great birthplace for young stars, which form in the cloud.[5] V1331 Cygni is heavily obscured by dust, so the properties of the central star are hard to deduce; however, it is estimated to have a radius five times that of the Sun and a mass of 2.8 M☉.[3]
The General Catalog of Variable Stars classifies V1331 Cygni as an "INST" type variable, meaning a T Tauri star which shows rapid light variations.[7][8] Its visual band brightness varies from magnitude 13.08 to 10.58.[7] It is sometimes classified as a pre-FUOR star.[9] A semi-regular period of ~449 days has been reported.[9] Unlike many T Tauri stars, the mean brightness of V1331 Cygni remains nearly constant over long time periods.[10][6]
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