20 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.362[3] |
| Characteristics | |
| Spectral type | B3 V,[4] B3 IV,[5] or B2/3 II[6] |
| B−V Template:Engvar | +0.088[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Proper motion (μ) | RA: +14.040[2] mas/yr Dec.: –6.814[2] mas/yr |
| Parallax (π) | 3.5374±0.1720 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −2.02[8] |
| Details | |
| Mass | Script error: No such module "val".[9] Template:Solar mass |
| Luminosity (bolometric) | 7,284[3] Template:Solar luminosity |
| Temperature | 18,700[3] K |
| Rotational velocity (v sin i) | Script error: No such module "val".[4] km/s |
| Age | Script error: No such module "val".[9] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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20 Aquilae, abbreviated 20 Aql, is an irregular variable[11] star in the equatorial constellation of Aquila. 20 Aquilae is its Flamsteed designation. It ranges in magnitude from a peak of 5.33 down to 5.36, which is bright enough for the star to be visible to the naked eye.[12] The estimated distance to this star is around 920 light years, based upon an annual parallax shift of Script error: No such module "val"..[2] The star is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.[7]
There has been some disagreement over the stellar classification of this star. Buscombe (1962) listed a class of B3 IV,[5] which suggests a B-type subgiant star that has exhausted the hydrogen at its core and is expanding off the main sequence. Lesh (1968)[13] and Braganca et al. (2012)[4] matched a B-type main sequence star with a class of B3 V. However, Houk and Swift (1999) found a class of B2/3 II,[6] indicating this is an evolved bright giant.
The star is about 28[9] million years old with a high rate of spin, showing a projected rotational velocity of 133 km/s.[4] It has 8.6[9] times the mass of the Sun and is radiating 7,284 times the Sun's luminosity from its photosphere at an effective temperature of 18,700 K.[3]
References
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- ↑ Template:Cite simbad
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