| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 28m 57.08327s[1] |
| Declination | 24° 46′ 07.2656″[1] |
| Apparent magnitude (V) | 5.82[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−Vcolor index | 1.023±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −28.58±0.20[2] km/s |
| Proper motion (μ) | RA: 8.750[1]mas/yr Dec.: 16.334[1]mas/yr |
| Parallax (π) | 7.1397±0.0739 mas[1] |
| Distance | 457 ± 5 ly (140 ± 1 pc) |
| Absolute magnitude (MV) | −0.16[2] |
| Details | |
| Mass | 3.07[4] M☉ |
| Radius | 13.8+0.2 −0.4[1] R☉ |
| Luminosity | 100.5±1.3[1] L☉ |
| Surface gravity (log g) | 2.63[4] cgs |
| Temperature | 4,915+71 −30[1] K |
| Metallicity [Fe/H] | +0.11[4] dex |
| Age | 324[5] Myr |
| Other designations | |
| 8 Vul,BD+24 3761,HD 183491,HIP 95785,HR 7406,SAO 87267[6] | |
| Database references | |
| SIMBAD | data |
8 Vulpeculae isstar located about 457[1] light years away in the northernconstellation ofVulpecula.[6] It lies just7′ fromAlpha Vulpeculae and the two form anoptical double.[7] 8 Vulpeculae is visible to the naked eye as a faint, yellow-orange hued star with anapparent visual magnitude of 5.82. It is moving closer to the Earth with a heliocentricradial velocity of −29 km/s.[2]
This is an aginggiant star with astellar classification of K0 III,[3] which indicates it has exhausted the hydrogen supply at itscore andevolved away from themain sequence. It is 324[5] million years old with three[4] times themass of the Sun and has expanded to 14[1] times theSun's radius. The star is radiating 100[1] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,915 K.[1]
