13 Vulpeculae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| 13 Vulpeculae A | |
| Right ascension | 19h 53m 27.6957s |
| Declination | 24° 04′ 46.608″ |
| Apparent magnitude (V) | 4.584±0.008 |
| 13 Vulpeculae B | |
| Right ascension | 19h 53m 27.6102s |
| Declination | 24° 04′ 46.077″ |
| Characteristics | |
| Spectral type | B9.5III |
| Apparent magnitude (U) | 4.404±0.012 |
| Apparent magnitude (B) | 4.536±0.010 |
| Astrometry | |
| 13 Vulpeculae A | |
| Radial velocity (Rv) | −28.10 km/s |
| Proper motion (μ) | RA: 22.325±0.065 mas/yr Dec.: 36.510±0.072 mas/yr |
| Parallax (π) | 9.6342±0.0902 mas |
| Distance | 339 ± 3 ly (103.8 ± 1.0 pc) |
| Absolute magnitude (MV) | −0.48 |
| 13 Vulpeculae B | |
| Proper motion (μ) | RA: 14.037±0.135 mas/yr Dec.: 32.954±0.131 mas/yr |
| Parallax (π) | 9.8828 ± 0.1524 mas |
| Distance | 330 ± 5 ly (101 ± 2 pc) |
| Orbit | |
| Period (P) | 615.25±104.12 yr |
| Semi-major axis (a) | 1.555±0.241″ |
| Eccentricity (e) | 0.079±0.042 |
| Inclination (i) | 85.9±1.5° |
| Longitude of the node (Ω) | 68.1±0.3° |
| Periastron epoch (T) | 2027.82±94.79 |
| Argument of periastron (ω) (secondary) | 169.7±4.4° |
| Details | |
| 13 Vul A | |
| Radius | 1.3 R☉ |
| Luminosity | 180 L☉ |
| Temperature | 8,801 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 45.0 km/s |
| Other designations | |
| 13 Vul, BD+23°3820, GC 27544, HD 188260, HIP 97886, HR 7592, SAO 87883, CCDM J19535+2405AB, WDS J19535+2405AB, 2MASS J19532768+2404464 | |
| Database references | |
| SIMBAD | data |
13 Vulpeculae is a blue giant with a stellar classification of class B9.5III in the northern constellation Vulpecula. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.57 and it is approximately 339 light years away from the Sun based on parallax. The star is radiating 180 times the luminosity of the Sun from its photosphere at an effective temperature of 8,801 K.
There is one reported companion, designated component B, with a magnitude of 7.37, an orbital period of roughly 615 years, and an angular separation of 1.55″. The system is moving closer to the Earth with a heliocentric radial velocity of −28 km/s.