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Star in the constellation Vulpecula From Wikipedia, the free encyclopedia
27 Vulpeculae is a single,[10] blue-white star in the northern constellation of Vulpecula. It is a dim star, visible to the naked eye, with an apparent visual magnitude of 5.59.[2] An annual parallax shift of 10.6692±0.0483 mas[1] provides a distance estimate of about 306 light-years. It is moving closer with a heliocentric radial velocity of −22 km/s,[6] and will make perihelion passage at a distance of around 119 ly (36.56 pc) in 3.75 million years.[5]
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−V color 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 | |
Database references | |
SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B9 V.[3] It is spinning rapidly, showing a projected rotational velocity of 335.[4] The star has an estimated 2.77[4] times the mass of the Sun and about 3.1[7] times the Sun's radius. It is radiating 75[4] times the Sun's luminosity from its photosphere at an effective temperature of 10,789 K.[4]
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