13 Vulpeculae
Star in the constellation Vulpecula
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13 Vulpeculae is a blue giant with a stellar classification of class B9.5III[1] 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[1] and it is approximately 339 light years away from the Sun based on parallax. The star is radiating 180[1] times the luminosity of the Sun from its photosphere at an effective temperature of 8,801 K.[9]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula[1] |
| 13 Vulpeculae A | |
| Right ascension | 19h 53m 27.6957s[2] |
| Declination | 24° 04′ 46.608″[2] |
| Apparent magnitude (V) | 4.64[3] |
| 13 Vulpeculae B | |
| Right ascension | 19h 53m 27.6102s[4] |
| Declination | 24° 04′ 46.077″[4] |
| Apparent magnitude (V) | 7.34[3] |
| Characteristics | |
| 13 Vulpeculae A | |
| Spectral type | B9.5III[1] |
| Apparent magnitude (U) | 4.404±0.012[5] |
| Apparent magnitude (B) | 4.536±0.010[5] |
| Astrometry | |
| 13 Vulpeculae A | |
| Radial velocity (Rv) | −28.10[6] km/s |
| Proper motion (μ) | RA: 22.325±0.065[2] mas/yr Dec.: 36.510±0.072[2] mas/yr |
| Parallax (π) | 9.6342±0.0902 mas[2] |
| Distance | 339 ± 3 ly (103.8 ± 1.0 pc) |
| Absolute magnitude (MV) | −0.48[1] |
| 13 Vulpeculae B | |
| Proper motion (μ) | RA: 14.037±0.135[4] mas/yr Dec.: 32.954±0.131[4] mas/yr |
| Parallax (π) | 9.8828±0.1524 mas[4] |
| Distance | 330 ± 5 ly (101 ± 2 pc) |
| Orbit[7] | |
| 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[8] R☉ |
| Luminosity | 180[1] L☉ |
| Temperature | 8,801[9] K |
| Metallicity [Fe/H] | −0.11[1] dex |
| Rotational velocity (v sin i) | 45.0[10] 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[11] | |
| Database references | |
| SIMBAD | data |
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″.[12] The system is moving closer to the Earth with a heliocentric radial velocity of −28 km/s.[6]