| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h58m 16.34942s[1] |
| Declination | +22° 19′ 33.2638″[1] |
| Apparent magnitude (V) | 5.31[2] |
| Characteristics | |
| Spectral type | K3.5 III[2] |
| B−V color index | 1.419±0.005[3] |
| Astrometry | |
| Radial velocity (Rv) | −25.23±0.24[3] km/s |
| Proper motion (μ) | RA: −2.327[1] mas/yr Dec.: −4.511[1] mas/yr |
| Parallax (π) | 6.5257 ± 0.1689 mas[1] |
| Distance | 500 ± 10 ly (153 ± 4 pc) |
| Absolute magnitude (MV) | −0.41[3] |
| Details | |
| Radius | 35.34+1.13 −2.22[1] R☉ |
| Luminosity | 333.7±9.9[1] L☉ |
| Surface gravity (log g) | 1.91[4] cgs |
| Temperature | 4,070[4] K |
| Metallicity [Fe/H] | −0.12[4] dex |
| Other designations | |
33 Vul, BD+21° 4424, FK5 1549, HD 199697, HIP 103511, HR 8032, SAO 89332[5] | |
| Database references | |
| SIMBAD | data |
33 Vulpeculae is a single[6] star located around 500 light-years away from the Sun in the northern constellationofVulpecula. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.31.[2] The object is drifting closer to the Earth with a heliocentric radial velocity of −25 km/s.[3]
This is an evolved giant star with a stellar classification of K3.5 III,[2] having exhausted the supply of hydrogen at it its core and expanded to 35[1] times the Sun's radius. It serves as a spectral standard for stars of its particular class.[7] This star is radiating 334[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,070 K.[4]
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