Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 06m 37.7345s [1] |
Declination | +28° 37′ 42.941″ [1] |
Apparent magnitude (V) | 5.53 [2] |
Characteristics | |
Spectral type | F0III [3] or A7V [4] |
U−B color index | +0.04 |
B−V color index | 0.296±0.003 [2] |
Astrometry | |
Radial velocity (Rv) | −24.0±4.3 [5] km/s |
Proper motion (μ) |
RA: 75.662
[1]
mas/
yr Dec.: 85.291 [1] mas/ yr |
Parallax (π) | 24.3974 ± 0.0867 mas [1] |
Distance | 133.7 ± 0.5
ly (41.0 ± 0.1 pc) |
Absolute magnitude (MV) | 2.52 [2] |
Details | |
Mass | 1.54 [6] M☉ |
Radius | 1.83+0.10 −0.06 [1] R☉ |
Luminosity | 8.233±0.038 [1] L☉ |
Surface gravity (log g) | 4.21±0.14 [6] cgs |
Temperature | 7,220+126 −175 [1] K |
Metallicity [Fe/H] | 0.04 [7] dex |
Age | 498 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 178233 is a single [9] star in the northern constellation of Lyra. It is bright enough to be dimly visible to the naked eye with an apparent visual magnitude of 5.53, [2] making it a sixth magnitude star. The distance to HD 178233 is 134 light years based on parallax measurements, but it is drifting closer to the Sun with a radial velocity of approximately −24 km/s. [5]
The stellar classification of this star was determined to be F0III by A. Cowley and associates (1969), [3] matching an evolved F-type giant star. In contrast, D. R. Palmer and associates (1968) listed it as an A-type main-sequence star with a class of A7V. [4] It is about a half billion years old and is spinning rapidly with a projected rotational velocity of 165.0 km/s, which is giving the star an equatorial bulge that is ~24% wider than the polar radius. [10] The star has 1.5 [6] times the mass and 1.8 [1] times the mean radius of the Sun. It is radiating over eight times the luminosity of the Sun from its photosphere at an effective temperature of 7,220 K. [1]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 06m 37.7345s [1] |
Declination | +28° 37′ 42.941″ [1] |
Apparent magnitude (V) | 5.53 [2] |
Characteristics | |
Spectral type | F0III [3] or A7V [4] |
U−B color index | +0.04 |
B−V color index | 0.296±0.003 [2] |
Astrometry | |
Radial velocity (Rv) | −24.0±4.3 [5] km/s |
Proper motion (μ) |
RA: 75.662
[1]
mas/
yr Dec.: 85.291 [1] mas/ yr |
Parallax (π) | 24.3974 ± 0.0867 mas [1] |
Distance | 133.7 ± 0.5
ly (41.0 ± 0.1 pc) |
Absolute magnitude (MV) | 2.52 [2] |
Details | |
Mass | 1.54 [6] M☉ |
Radius | 1.83+0.10 −0.06 [1] R☉ |
Luminosity | 8.233±0.038 [1] L☉ |
Surface gravity (log g) | 4.21±0.14 [6] cgs |
Temperature | 7,220+126 −175 [1] K |
Metallicity [Fe/H] | 0.04 [7] dex |
Age | 498 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 178233 is a single [9] star in the northern constellation of Lyra. It is bright enough to be dimly visible to the naked eye with an apparent visual magnitude of 5.53, [2] making it a sixth magnitude star. The distance to HD 178233 is 134 light years based on parallax measurements, but it is drifting closer to the Sun with a radial velocity of approximately −24 km/s. [5]
The stellar classification of this star was determined to be F0III by A. Cowley and associates (1969), [3] matching an evolved F-type giant star. In contrast, D. R. Palmer and associates (1968) listed it as an A-type main-sequence star with a class of A7V. [4] It is about a half billion years old and is spinning rapidly with a projected rotational velocity of 165.0 km/s, which is giving the star an equatorial bulge that is ~24% wider than the polar radius. [10] The star has 1.5 [6] times the mass and 1.8 [1] times the mean radius of the Sun. It is radiating over eight times the luminosity of the Sun from its photosphere at an effective temperature of 7,220 K. [1]