V1331 Cygni
Star in constellation Cygnus
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V1331 Cygni (also known as V1331 Cyg) is a young star in the located 1,950 light years from Earth on the constellation of Cygnus. V1331 Cyg is located in the dark nebula LDN 981.[4]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 01m 09.20684s[1] |
| Declination | +50° 21′ 44.8033″[1] |
| Apparent magnitude (V) | 11.99[2] |
| Characteristics | |
| Evolutionary stage | pre-main sequence[3] |
| 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☉ |
| Luminosity | 21 L☉ |
| Temperature | 5200 K |
| Other designations | |
| V1331 Cyg, GSC 03596-00959, 2MASS J21010920+5021445 | |
| Database references | |
| SIMBAD | data |
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.[6] 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][5]
Gallery
Dark nebula LDN 981 and V1331 Cygni (top center) by the Mount Lemmon SkyCenter
