8 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.08[3] |
| Characteristics | |
| Spectral type | F0 IV[4] or F2 III[5] |
| U−B Template:Engvar | +0.06[6] |
| B−V Template:Engvar | Script error: No such module "val".[7] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | +11.8[3] km/s |
| Proper motion (μ) | RA: +2.019[2] mas/yr Dec.: −21.411[2] mas/yr |
| Parallax (π) | 12.0549±0.0268 mas |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 1.27[5] |
| Details | |
| Mass | 1.60[8] Template:Solar mass |
| Radius | 3.0[2] Template:Solar radius |
| Luminosity | 18.89[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | 0.14[5] dex |
| Rotational velocity (v sin i) | 105[9] km/s |
| Age | 959[8] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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8 Aquilae is a star in the equatorial constellation of Aquila,[10] located 271 light years away from the Sun. 8 Aquilae is the Flamsteed designation. It can be viewed with the naked eye in good seeing conditions, appearing as a dim, yellow-white hued star with an apparent visual magnitude of 6.08.[3] The star is moving further from the Earth with a heliocentric radial velocity of +12 km/s.[3]
Abt and Morrell (1995) found a stellar classification of F0 IV[4] for this star, suggesting it is an F-type subgiant. In their 2010 study, Fox Machado et al. assigned a class of F2 III,[5] which matches an evolved giant star. Despite the spectral classifications, evolutionary models place the star towards the end of its main sequence life, with an age of about a billion years.[8][2]
Lester Fox Machado et al. discovered that 8 Aquilae is a variable star during observations conducted in 2003, and published in 2007.[1] It is a Delta Scuti variable with at least three overlapping pulsation frequencies, although the total amplitude of its brightness variations is only about 0.02 magnitudes.[5] It has a relatively high rotation rate, showing a projected rotational velocity of 105 km/s.[9] It has 1.6[8] times the mass of the Sun and is radiating 19[7] times the Sun's luminosity from its photosphere at an effective temperature of about 7,395 K.[8]
References
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