  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 37m 04.6724s[1] |
| Declination | +26° 27′ 43.006″[1] |
| Apparent magnitude (V) | 5.590[2] |
| Characteristics | |
| Spectral type | B9 V[3][4] |
| B−Vcolor index | −0.050±0.004[5] |
| Astrometry | |
| Radial velocity (Rv) | −21.8±4.3[6] km/s |
| Proper motion (μ) | RA: 15.349±0.042[1]mas/yr Dec.: −11.775±0.040[1]mas/yr |
| Parallax (π) | 10.6692±0.0483 mas[1] |
| Distance | 306 ± 1 ly (93.7 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.65[5] |
| Details | |
| Mass | 2.77±0.03[4] M☉ |
| Radius | 3.1[7] R☉ |
| Luminosity | 75.0+4.8 −4.5[4] L☉ |
| Surface gravity (log g) | 3.781[8] cgs |
| Temperature | 10,789+50 −49[4] K |
| Metallicity[Fe/H] | −0.27±0.04[5] dex |
| Rotational velocity (v sin i) | 335[4] km/s |
| Other designations | |
| 27 Vul,BD+25° 4302,FK5 3649,HD 196504,HIP 101716,HR 7880,SAO 88903[9] | |
| Database references | |
| SIMBAD | data |
27 Vulpeculae is a single,[10] blue-whitestar in the northernconstellation ofVulpecula. It is a dim star, visible to the naked eye, with anapparent visual magnitude of 5.59.[2] An annualparallax shift of10.6692±0.0483 mas[1] provides a distance estimate of about 306 light-years. It is moving closer with a heliocentricradial velocity of −22 km/s,[6] and will makeperihelion passage at a distance of around 119 ly (36.56 pc) in 3.75 million years.[5]
This is aB-type main-sequence star with astellar classification of B9 V.[3] It is spinning rapidly, showing aprojected rotational velocity of 335.[4] The star has an estimated 2.77[4] times themass of the Sun and about 3.1[7] times theSun's radius. It is radiating 75[4] times theSun's luminosity from itsphotosphere at aneffective temperature of 10,789 K.[4]
