Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 18m 50.94777s [1] |
Declination | 00° 20′ 20.5448″ [1] |
Apparent magnitude (V) | 6.423 [2] |
Characteristics | |
Spectral type | K0-IIIa:CH1Ba0.5 [3] |
U−B color index | +0.770 [2] |
B−V color index | +1.050 [2] |
Astrometry | |
Radial velocity (Rv) | −26.13±0.15 [1] km/s |
Proper motion (μ) |
RA: +10.755
[1]
mas/
yr Dec.: +11.298 [1] mas/ yr |
Parallax (π) | 7.5115 ± 0.0437 mas [1] |
Distance | 434 ± 3
ly (133.1 ± 0.8 pc) |
Absolute magnitude (MV) | +0.64 [4] |
Details | |
Mass | 2.2 [4] M☉ |
Radius | 11.17+0.32 −0.70 [1] R☉ |
Luminosity | 56.397±0.468 [1] L☉ |
Surface gravity (log g) | 2.48 [5] cgs |
Temperature | 4,733+155 −67 [1] K |
Metallicity [Fe/H] | −0.19±0.06 [5] dex |
Age | 0.5 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
24 Aquilae (abbreviated 24 Aql) is a star in the equatorial constellation of Aquila. 24 Aquilae is its Flamsteed designation. It is located at a distance of around 434 light-years (133 parsecs) [1] from Earth and has an apparent visual magnitude of 6.4. [2] According to the Bortle Dark-Sky Scale, this star is just visible to the naked eye in dark rural skies. It is drifting closer to the Sun with a radial velocity of −26 km/s. [1]
This is a so-called mild barium star, as identified by the presence of a weak absorption line of singly-ionized barium atoms at a wavelength of 455.4 nm. Such stars display an atmospheric overabundance of carbon and the heavy elements produced by the s-process, which was most likely transferred into the atmosphere by a wide binary stellar companion. However, in the case of 24 Aquilae, the abundances of heavy elements are near normal. [4]
At an estimated age of a half billion years, [4] 24 Aquilae is a evolved giant star with a stellar classification of K0 IIIa. [4] It has more than double the mass of the Sun, 11 times the Sun's radius, and shines with 56 times the Sun's luminosity. [1] It is radiating this energy into space from its outer atmosphere at an effective temperature of 4,733 K. [1] This heat is what gives it the cool orange hue characteristic of a K-type star. [7]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 18m 50.94777s [1] |
Declination | 00° 20′ 20.5448″ [1] |
Apparent magnitude (V) | 6.423 [2] |
Characteristics | |
Spectral type | K0-IIIa:CH1Ba0.5 [3] |
U−B color index | +0.770 [2] |
B−V color index | +1.050 [2] |
Astrometry | |
Radial velocity (Rv) | −26.13±0.15 [1] km/s |
Proper motion (μ) |
RA: +10.755
[1]
mas/
yr Dec.: +11.298 [1] mas/ yr |
Parallax (π) | 7.5115 ± 0.0437 mas [1] |
Distance | 434 ± 3
ly (133.1 ± 0.8 pc) |
Absolute magnitude (MV) | +0.64 [4] |
Details | |
Mass | 2.2 [4] M☉ |
Radius | 11.17+0.32 −0.70 [1] R☉ |
Luminosity | 56.397±0.468 [1] L☉ |
Surface gravity (log g) | 2.48 [5] cgs |
Temperature | 4,733+155 −67 [1] K |
Metallicity [Fe/H] | −0.19±0.06 [5] dex |
Age | 0.5 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
24 Aquilae (abbreviated 24 Aql) is a star in the equatorial constellation of Aquila. 24 Aquilae is its Flamsteed designation. It is located at a distance of around 434 light-years (133 parsecs) [1] from Earth and has an apparent visual magnitude of 6.4. [2] According to the Bortle Dark-Sky Scale, this star is just visible to the naked eye in dark rural skies. It is drifting closer to the Sun with a radial velocity of −26 km/s. [1]
This is a so-called mild barium star, as identified by the presence of a weak absorption line of singly-ionized barium atoms at a wavelength of 455.4 nm. Such stars display an atmospheric overabundance of carbon and the heavy elements produced by the s-process, which was most likely transferred into the atmosphere by a wide binary stellar companion. However, in the case of 24 Aquilae, the abundances of heavy elements are near normal. [4]
At an estimated age of a half billion years, [4] 24 Aquilae is a evolved giant star with a stellar classification of K0 IIIa. [4] It has more than double the mass of the Sun, 11 times the Sun's radius, and shines with 56 times the Sun's luminosity. [1] It is radiating this energy into space from its outer atmosphere at an effective temperature of 4,733 K. [1] This heat is what gives it the cool orange hue characteristic of a K-type star. [7]