| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 58m 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 | |
| Database references | |
| SIMBAD | data |
33 Vulpeculae is a single[6] star located around 500 light-years away from the Sun in the northern constellation of Vulpecula. 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]
GaiaDR2 was invoked but never defined (see the help page).perkins1989 was invoked but never defined (see the help page).Anderson2012 was invoked but never defined (see the help page).Soubiran2010 was invoked but never defined (see the help page).SIMBAD was invoked but never defined (see the help page).Eggleton2008 was invoked but never defined (see the help page).Keenan1988 was invoked but never defined (see the help page).