28 Aquilae
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 19m 39.34859s[1] |
| Declination | +12° 22′ 28.8521″[1] |
| Apparent magnitude (V) | 5.531[2] |
| Characteristics | |
| Spectral type | F0 III[2] |
| U−B color index | +0.182[3] |
| B−V color index | +0.257[3] |
| Variable type | δ Sct[4] |
| Astrometry | |
| Radial velocity (Rv) | +4.36[2] km/s |
| Proper motion (μ) | RA: 5.21[1] mas/yr Dec.: 17.30[1] mas/yr |
| Parallax (π) | 9.67 ± 0.32[1] mas |
| Distance | 340 ± 10 ly (103 ± 3 pc) |
| Details | |
| Surface gravity (log g) | 3.41[5] cgs |
| Temperature | 7,250[2] K |
| Metallicity [Fe/H] | –0.16[2] dex |
| Rotational velocity (v sin i) | 57[6] km/s |
| Other designations | |
28 Aquilae (abbreviated 28 Aql) is a star in the equatorial constellation of Aquila. 28 Aquilae is its Flamsteed designation though it also bears the Bayer designation A Aquilae. It has an apparent visual magnitude is 5.5,[2] making this a faint star that requires dark suburban skies to view (according to the Bortle Dark-Sky Scale). The annual parallax shift of 9.67 mas[1] means this star is located at a distance of approximately 340 light-years (100 parsecs) from Earth.
The spectrum of this star matches a stellar classification of F0 III,[2] with the luminosity class of III indicating this is most likely an evolved giant star. The variability of this star was discovered by Michel Breger in 1969. It was revealed to be a Delta Scuti-type pulsating variable star with at least two periods of pulsation. The known periods have frequencies of 6.68 and 7.12 cycles per day.[4] The outer atmosphere has an effective temperature of 7,250 K,[2] which lies in the range of a yellow-white hued F-type star.[8]
References
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