Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 18h 44m 48.19919s [1] |
Declination | +37° 35′ 40.5585″ [1] |
Apparent magnitude (V) | 5.74 [2] |
Characteristics | |
Spectral type | F0 IVn [3] or F1Vnn [4] |
U−B color index | +0.06 [2] |
B−V color index | +0.29 [2] |
Astrometry | |
Radial velocity (Rv) | −25.0±3.7 [5] km/s |
Proper motion (μ) |
RA: +23.969
[1]
mas/
yr Dec.: +23.461 [1] mas/ yr |
Parallax (π) | 20.6386 ± 0.0443 mas [1] |
Distance | 158.0 ± 0.3
ly (48.5 ± 0.1 pc) |
Absolute magnitude (MV) | +2.34 [6] |
Details | |
Mass | 1.74 [7] M☉ |
Radius | 2.03±0.02 [1] R☉ |
Luminosity | 9.5±0.1 [1] L☉ |
Surface gravity (log g) | 3.94 [7] cgs |
Temperature | 7,257+37 −3 [1] K |
Metallicity [Fe/H] | −0.36 [1] dex |
Rotational velocity (v sin i) | 212 [8] km/s |
Age | 1.223 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Zeta2 Lyrae is a single, [10] white-hued star in the northern constellation of Lyra. It is a dim star that is just visible to the naked eye with an apparent visual magnitude of 5.74 [2] An annual parallax shift of 20.6 mas as seen from Earth provides a distance estimate of about 158 light years from the Sun. It is moving closer to the Sun with a radial velocity of −25 km/s. [5]
This star has a stellar classification of F0 IVn, [3] suggesting it is an F-type subgiant star that is evolving away from the main sequence as its supply of hydrogen at the core has been consumed. The n suffix indicates "nebulous" lines caused by its rotation. It is spinning rapidly with a projected rotational velocity of 212 km/s. [8] This is giving the star an oblate shape with an equatorial bulge that is an estimated 29% larger than the polar radius. [11] The star is radiating approximately 9.6 times the Sun's luminosity from the photosphere at an effective temperature of about 7,000 K. [1] It has 1.7 [7] times the mass of the Sun, twice the Sun's radius, [1] and is about 1.2 [7] billion years old.
It is a suspected variable. [9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 18h 44m 48.19919s [1] |
Declination | +37° 35′ 40.5585″ [1] |
Apparent magnitude (V) | 5.74 [2] |
Characteristics | |
Spectral type | F0 IVn [3] or F1Vnn [4] |
U−B color index | +0.06 [2] |
B−V color index | +0.29 [2] |
Astrometry | |
Radial velocity (Rv) | −25.0±3.7 [5] km/s |
Proper motion (μ) |
RA: +23.969
[1]
mas/
yr Dec.: +23.461 [1] mas/ yr |
Parallax (π) | 20.6386 ± 0.0443 mas [1] |
Distance | 158.0 ± 0.3
ly (48.5 ± 0.1 pc) |
Absolute magnitude (MV) | +2.34 [6] |
Details | |
Mass | 1.74 [7] M☉ |
Radius | 2.03±0.02 [1] R☉ |
Luminosity | 9.5±0.1 [1] L☉ |
Surface gravity (log g) | 3.94 [7] cgs |
Temperature | 7,257+37 −3 [1] K |
Metallicity [Fe/H] | −0.36 [1] dex |
Rotational velocity (v sin i) | 212 [8] km/s |
Age | 1.223 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Zeta2 Lyrae is a single, [10] white-hued star in the northern constellation of Lyra. It is a dim star that is just visible to the naked eye with an apparent visual magnitude of 5.74 [2] An annual parallax shift of 20.6 mas as seen from Earth provides a distance estimate of about 158 light years from the Sun. It is moving closer to the Sun with a radial velocity of −25 km/s. [5]
This star has a stellar classification of F0 IVn, [3] suggesting it is an F-type subgiant star that is evolving away from the main sequence as its supply of hydrogen at the core has been consumed. The n suffix indicates "nebulous" lines caused by its rotation. It is spinning rapidly with a projected rotational velocity of 212 km/s. [8] This is giving the star an oblate shape with an equatorial bulge that is an estimated 29% larger than the polar radius. [11] The star is radiating approximately 9.6 times the Sun's luminosity from the photosphere at an effective temperature of about 7,000 K. [1] It has 1.7 [7] times the mass of the Sun, twice the Sun's radius, [1] and is about 1.2 [7] billion years old.
It is a suspected variable. [9]