Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 40m 43.31912s [1] |
Declination | –00° 37′ 16.3868″ [1] |
Apparent magnitude (V) | 5.656 [2] (5.9 + 7.6) [3] |
Characteristics | |
Spectral type | A3 IV [4] |
U−B color index | +0.09 [2] |
B−V color index | +0.11 [2] |
Astrometry | |
Radial velocity (Rv) | -46 [5] km/s |
Proper motion (μ) |
RA: +15.683
[1]
mas/
yr Dec.: +5.323 [1] mas/ yr |
Parallax (π) | 9.3151 ± 0.1561 mas [1] |
Distance | 350 ± 6
ly (107 ± 2 pc) |
Absolute magnitude (MV) | 0.49 [6] |
Orbit [7] | |
Primary | 5 Aql Aa |
Companion | 5 Aql Ab |
Period (P) | 20.31 ± 0.17 yr |
Semi-major axis (a) | 0.0850 ± 0.0020″ |
Eccentricity (e) | 0.054 ± 0.047 |
Inclination (i) | 158.3 ± 7.9° |
Longitude of the node (Ω) | 202.0 ± 15.0° |
Periastron epoch (T) | 1996.06 ± 0.92 |
Argument of periastron (ω) (secondary) | 346.0 ± 25.0° |
Details | |
45 Aql Aa | |
Mass | 2.63±0.10 [8] M☉ |
Luminosity | 75.8+13.8 −11.7 [8] L☉ |
Temperature | 9,016+167 −165 [8] K |
Rotational velocity (v sin i) | 75 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
45 Aquilae, abbreviated 45 Aql, is a triple star system in the equatorial constellation of Aquila. 45 Aquilae is its Flamsteed designation. It is located 350 light-years (110 parsecs) away from Earth, give or take a 6 light-year margin of error, and has a combined apparent visual magnitude of 5.7. [2] The system is moving closer to the Earth with a heliocentric radial velocity of -46 km/s. [5]
Based upon a stellar classification of A3 IV, [4] the primary component of this system is a subgiant star that is in the process of evolving away from the main sequence. The star has 2.6 [8] times the mass of the Sun and is spinning with a projected rotational velocity of 75 km/s. [8] It has an orbiting companion with a period of 20.31 years and an eccentricity of 0.054. At an angular separation of 42.2 arcseconds from this pair is a 12.7 magnitude tertiary companion. [10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 40m 43.31912s [1] |
Declination | –00° 37′ 16.3868″ [1] |
Apparent magnitude (V) | 5.656 [2] (5.9 + 7.6) [3] |
Characteristics | |
Spectral type | A3 IV [4] |
U−B color index | +0.09 [2] |
B−V color index | +0.11 [2] |
Astrometry | |
Radial velocity (Rv) | -46 [5] km/s |
Proper motion (μ) |
RA: +15.683
[1]
mas/
yr Dec.: +5.323 [1] mas/ yr |
Parallax (π) | 9.3151 ± 0.1561 mas [1] |
Distance | 350 ± 6
ly (107 ± 2 pc) |
Absolute magnitude (MV) | 0.49 [6] |
Orbit [7] | |
Primary | 5 Aql Aa |
Companion | 5 Aql Ab |
Period (P) | 20.31 ± 0.17 yr |
Semi-major axis (a) | 0.0850 ± 0.0020″ |
Eccentricity (e) | 0.054 ± 0.047 |
Inclination (i) | 158.3 ± 7.9° |
Longitude of the node (Ω) | 202.0 ± 15.0° |
Periastron epoch (T) | 1996.06 ± 0.92 |
Argument of periastron (ω) (secondary) | 346.0 ± 25.0° |
Details | |
45 Aql Aa | |
Mass | 2.63±0.10 [8] M☉ |
Luminosity | 75.8+13.8 −11.7 [8] L☉ |
Temperature | 9,016+167 −165 [8] K |
Rotational velocity (v sin i) | 75 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
45 Aquilae, abbreviated 45 Aql, is a triple star system in the equatorial constellation of Aquila. 45 Aquilae is its Flamsteed designation. It is located 350 light-years (110 parsecs) away from Earth, give or take a 6 light-year margin of error, and has a combined apparent visual magnitude of 5.7. [2] The system is moving closer to the Earth with a heliocentric radial velocity of -46 km/s. [5]
Based upon a stellar classification of A3 IV, [4] the primary component of this system is a subgiant star that is in the process of evolving away from the main sequence. The star has 2.6 [8] times the mass of the Sun and is spinning with a projected rotational velocity of 75 km/s. [8] It has an orbiting companion with a period of 20.31 years and an eccentricity of 0.054. At an angular separation of 42.2 arcseconds from this pair is a 12.7 magnitude tertiary companion. [10]