8 Vulpeculae
8 Vulpeculae is star located about 457 light years away in the northern constellation of Vulpecula. It lies just 7′ from Alpha Vulpeculae and the two form an optical double. 8 Vulpeculae is visible to the naked eye as a faint, yellow-orange hued star with an apparent visual magnitude of 5.82. It is moving closer to the Earth with a heliocentric radial velocity of −29 km/s.
α and 8 Vulpeculae form a pair at top center | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 28m 57.08327s |
| Declination | 24° 46′ 07.2656″ |
| Apparent magnitude (V) | 5.82 |
| Characteristics | |
| Spectral type | K0 III |
| B−V color index | 1.023±0.005 |
| Astrometry | |
| Radial velocity (Rv) | −28.58±0.20 km/s |
| Proper motion (μ) | RA: 8.750 mas/yr Dec.: 16.334 mas/yr |
| Parallax (π) | 7.1397 ± 0.0739 mas |
| Distance | 457 ± 5 ly (140 ± 1 pc) |
| Absolute magnitude (MV) | −0.16 |
| Details | |
| Mass | 3.07 M☉ |
| Radius | 13.8+0.2 −0.4 R☉ |
| Luminosity | 100.5±1.3 L☉ |
| Surface gravity (log g) | 2.63 cgs |
| Temperature | 4,915+71 −30 K |
| Metallicity [Fe/H] | +0.11 dex |
| Age | 324 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K0 III, which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is 324 million years old with three times the mass of the Sun and has expanded to 14 times the Sun's radius. The star is radiating 100 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,915 K.