Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 11m 46.008s [2] |
Declination | +31° 17′ 00.44″ [2] |
Apparent magnitude (V) | 5.93 [3] |
Characteristics | |
Spectral type | B8 IIIp Si Sr [4] |
B−V color index | −0.062±0.004 [3] |
Variable type | α2 CVn [5] |
Astrometry | |
Radial velocity (Rv) | −30.1±2.9 [3] km/s |
Proper motion (μ) |
RA: −4.143
mas/
yr
[2] Dec.: −2.763 mas/ yr [2] |
Parallax (π) | 3.4213 ± 0.0417 mas [2] |
Distance | 950 ± 10
ly (292 ± 4 pc) |
Absolute magnitude (MV) | −1.24 [3] |
Details | |
Mass | 3.76±0.22 [6] M☉ |
Radius | 6.40 [7] R☉ |
Luminosity | 397.48 [3] L☉ |
Temperature | 11,194+501 −479 [6] K |
Rotational velocity (v sin i) | 35 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
19 Lyrae is a single [10] variable star located approximately 950 [2] light years away from the Sun in the northern constellation of Lyra. [9] It has the variable star designation V471 Lyr, while 19 Lyrae is the Flamsteed designation. This object is just bright enough to be visible to the naked eye, appearing as a dim, blue-white star with a baseline apparent visual magnitude of 5.93. [3] It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s, and may come as close as 167 light-years around 8.5 million years from now. [3]
This is a magnetic chemically-peculiar star [11] with a stellar classification of B8 IIIp Si Sr, [4] showing abundance anomalies in silicon and strontium. The light variations of this star were discovered by J. E. Winzer in 1974. [12] It is an Alpha2 Canum Venaticorum-type variable with a period of 1.160898 days (or 7.0980 days [12]), ranging in magnitude from a high of 5.91 down to 5.98. [5] The surface magnetic field has a strength of (111.3±56.9)×10−4 T [13]
19 Lyrae has a moderate rotation rate, showing a projected rotational velocity of 35 km/s. [8] Stellar models give it an estimated 3.8 [6] times the mass of the Sun and its girth is measured at 6.4 [7] times the Sun's radius. It is radiating 397 [3] times the luminosity of the Sun from its photosphere at an effective temperature of around 11,194 K. [6] The star has an absolute magnitude of −1.24, [3] which shows how bright the star would appear if it were located at a distance of 10 parsecs (33 ly) from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 11m 46.008s [2] |
Declination | +31° 17′ 00.44″ [2] |
Apparent magnitude (V) | 5.93 [3] |
Characteristics | |
Spectral type | B8 IIIp Si Sr [4] |
B−V color index | −0.062±0.004 [3] |
Variable type | α2 CVn [5] |
Astrometry | |
Radial velocity (Rv) | −30.1±2.9 [3] km/s |
Proper motion (μ) |
RA: −4.143
mas/
yr
[2] Dec.: −2.763 mas/ yr [2] |
Parallax (π) | 3.4213 ± 0.0417 mas [2] |
Distance | 950 ± 10
ly (292 ± 4 pc) |
Absolute magnitude (MV) | −1.24 [3] |
Details | |
Mass | 3.76±0.22 [6] M☉ |
Radius | 6.40 [7] R☉ |
Luminosity | 397.48 [3] L☉ |
Temperature | 11,194+501 −479 [6] K |
Rotational velocity (v sin i) | 35 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
19 Lyrae is a single [10] variable star located approximately 950 [2] light years away from the Sun in the northern constellation of Lyra. [9] It has the variable star designation V471 Lyr, while 19 Lyrae is the Flamsteed designation. This object is just bright enough to be visible to the naked eye, appearing as a dim, blue-white star with a baseline apparent visual magnitude of 5.93. [3] It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s, and may come as close as 167 light-years around 8.5 million years from now. [3]
This is a magnetic chemically-peculiar star [11] with a stellar classification of B8 IIIp Si Sr, [4] showing abundance anomalies in silicon and strontium. The light variations of this star were discovered by J. E. Winzer in 1974. [12] It is an Alpha2 Canum Venaticorum-type variable with a period of 1.160898 days (or 7.0980 days [12]), ranging in magnitude from a high of 5.91 down to 5.98. [5] The surface magnetic field has a strength of (111.3±56.9)×10−4 T [13]
19 Lyrae has a moderate rotation rate, showing a projected rotational velocity of 35 km/s. [8] Stellar models give it an estimated 3.8 [6] times the mass of the Sun and its girth is measured at 6.4 [7] times the Sun's radius. It is radiating 397 [3] times the luminosity of the Sun from its photosphere at an effective temperature of around 11,194 K. [6] The star has an absolute magnitude of −1.24, [3] which shows how bright the star would appear if it were located at a distance of 10 parsecs (33 ly) from the Sun.