Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 38m 31.9139s [1] |
Declination | +24° 06′ 57.4433″ [1] |
Apparent magnitude (V) | 5.05 [2] |
Characteristics | |
Evolutionary stage | Subgiant |
Spectral type | B5IV [3] |
U−B color index | −0.53 [4] |
B−V color index | −0.14 [4] |
Astrometry | |
Radial velocity (Rv) | −22.6±1.2 [5] km/s |
Proper motion (μ) |
RA: 10.317±0.273
[1]
mas/
yr Dec.: −6.940±0.253 [1] mas/ yr |
Parallax (π) | 5.8740 ± 0.1760 mas [1] |
Distance | 560 ± 20
ly (170 ± 5 pc) |
Absolute magnitude (MV) | −0.96 [5] |
Details | |
Mass | 5.0 [2] M☉ |
Luminosity | 713 [2] L☉ |
Surface gravity (log g) | 3.77 [6] cgs |
Temperature | 15,200 [2] K |
Metallicity [Fe/H] | +0.02±0.04 [6] dex |
Rotational velocity (v sin i) | 285 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
28 Vulpeculae is a single [9] star in the northern constellation of Vulpecula. It lies approximately 560 light years away and is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.047. [2] The star is moving closer to the Sun with a heliocentric radial velocity of −23 km/s, and may come as close as 198 light-years in 5.9 million years. [5]
This is a subgiant star with a spectral class of B5 IV, [3] indicating a hot massive star that has started to evolve away from the main sequence after exhausting it core hydrogen. It has been included in a list of the least variable stars observed with the Hipparcos satellite; its brightness varied by no more than 0.0005 magnitudes in the Hipparcos passband. [10] The star has five [2] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 285 km/s. [7] It is radiating 713 times the Sun's luminosity from its photosphere at an effective temperature of 15,200 K. [2]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 38m 31.9139s [1] |
Declination | +24° 06′ 57.4433″ [1] |
Apparent magnitude (V) | 5.05 [2] |
Characteristics | |
Evolutionary stage | Subgiant |
Spectral type | B5IV [3] |
U−B color index | −0.53 [4] |
B−V color index | −0.14 [4] |
Astrometry | |
Radial velocity (Rv) | −22.6±1.2 [5] km/s |
Proper motion (μ) |
RA: 10.317±0.273
[1]
mas/
yr Dec.: −6.940±0.253 [1] mas/ yr |
Parallax (π) | 5.8740 ± 0.1760 mas [1] |
Distance | 560 ± 20
ly (170 ± 5 pc) |
Absolute magnitude (MV) | −0.96 [5] |
Details | |
Mass | 5.0 [2] M☉ |
Luminosity | 713 [2] L☉ |
Surface gravity (log g) | 3.77 [6] cgs |
Temperature | 15,200 [2] K |
Metallicity [Fe/H] | +0.02±0.04 [6] dex |
Rotational velocity (v sin i) | 285 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
28 Vulpeculae is a single [9] star in the northern constellation of Vulpecula. It lies approximately 560 light years away and is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.047. [2] The star is moving closer to the Sun with a heliocentric radial velocity of −23 km/s, and may come as close as 198 light-years in 5.9 million years. [5]
This is a subgiant star with a spectral class of B5 IV, [3] indicating a hot massive star that has started to evolve away from the main sequence after exhausting it core hydrogen. It has been included in a list of the least variable stars observed with the Hipparcos satellite; its brightness varied by no more than 0.0005 magnitudes in the Hipparcos passband. [10] The star has five [2] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 285 km/s. [7] It is radiating 713 times the Sun's luminosity from its photosphere at an effective temperature of 15,200 K. [2]