42 Aquilae
Star in the constellation Aquila
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42 Aquilae, abbreviated 42 Aql, is a single[9] star in the equatorial constellation of Aquila. 42 Aquilae is its Flamsteed designation. It is a dim star but visible to the naked eye under suitable viewing conditions, having an apparent visual magnitude of 5.45.[1] 42 Aql is located some 104.8 light years away, as determined from its annual parallax shift of 31.1 mas.[2] it is moving closer to the Earth with a heliocentric radial velocity of −38 km/s,[4] and is predicted to come to within 52 light-years of the Sun in around 752,000 years.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 19h 37m 47.31788s[2] |
| Declination | −04° 38′ 51.5050″[2] |
| Apparent magnitude (V) | 5.45[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F3 IV/V[3] |
| B−V color index | 0.429±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | −37.6±1.8[4] km/s |
| Proper motion (μ) | RA: +105.195[2] mas/yr Dec.: –53.710[2] mas/yr |
| Parallax (π) | 31.1168±0.0913 mas[2] |
| Distance | 104.8 ± 0.3 ly (32.14 ± 0.09 pc) |
| Absolute magnitude (MV) | 2.98[5] |
| Details | |
| Mass | 1.44[6] M☉ |
| Radius | 1.71[6] R☉ |
| Luminosity | 5.5[6] L☉ |
| Surface gravity (log g) | 4.13[6] cgs |
| Temperature | 6,749[6] K |
| Metallicity [Fe/H] | 0.17[4] dex |
| Rotational velocity (v sin i) | 87.0±4.4[5] km/s |
| Age | 1.283[7] Gyr |
| Other designations | |
| 42 Aql, BD−04°4861, HD 185124, HIP 96556, HR 7460, SAO 143621[8] | |
| Database references | |
| SIMBAD | data |
The stellar classification of this star is F3 IV/V,[3] which matches an F-type star with blended spectral traits of a main sequence star and a subgiant star. It is around 1.3[7] billion years old with a relatively high rate of rotation, having a projected rotational velocity of 87 km/s.[5] The star has 1.44 times the mass of the Sun and is radiating 5.5 times the Sun's luminosity from its photosphere at an effective temperature of 6,749 K.[6] These coordinates are a source of X-ray emission, which is most likely (99.3% chance) coming from the star.[10]