20 Vulpeculae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 12m 00.70176s |
| Declination | +26° 28′ 43.6989″ |
| Apparent magnitude (V) | 5.91 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B7 Ve |
| B−V color index | −0.107±0.003 |
| Astrometry | |
| Radial velocity (Rv) | −22.0±4.3 km/s |
| Proper motion (μ) | RA: +4.096 mas/yr Dec.: −9.524 mas/yr |
| Parallax (π) | 2.7904±0.0726 mas |
| Distance | 1,170 ± 30 ly (358 ± 9 pc) |
| Absolute magnitude (MV) | −2.13 |
| Details | |
| Mass | 4.02±0.14 M☉ |
| Radius | 3.0 R☉ |
| Luminosity | 460+88 −74 L☉ |
| Surface gravity (log g) | 2.90 cgs |
| Temperature | 12,050+168 −165 K |
| Rotational velocity (v sin i) | 236 km/s |
| Other designations | |
| 20 Vul, BD+26°3828, HD 192044, HIP 99531, HR 7719, SAO 88339 | |
| Database references | |
| SIMBAD | data |
20 Vulpeculae is single star located around 1,170 light years away in the northern constellation of Vulpecula. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.91. The object is moving closer to the Earth with a heliocentric radial velocity of −22 km/s.
This is a Be star with a stellar classification of B7 Ve. It is spinning rapidly with a projected rotational velocity of 236 km/s (compared to a critical velocity of 332 km/s) and has an estimated polar inclination of 71.1°. The star has four times the mass of the Sun and is radiating around 460 times the Sun's luminosity from its photosphere at an effective temperature of 12,050 K.