| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h36m 43.27606s[1] |
| Declination | –01° 17′ 11.7611″[1] |
| Apparent magnitude (V) | 4.364[2] |
| Characteristics | |
| Spectral type | B5 III[3] |
| U−B color index | –0.428[2] |
| B−V color index | –0.083[2] |
| R−I color index | –0.08 |
| Astrometry | |
| Radial velocity (Rv) | –21.4[4] km/s |
| Proper motion (μ) | RA: –0.87[1] mas/yr Dec.: –20.39[1] mas/yr |
| Parallax (π) | 8.34 ± 0.79 mas[1] |
| Distance | 390 ± 40 ly (120 ± 10 pc) |
| Absolute magnitude (MV) | −1.01[5] |
| Details | |
| Mass | 4.8 ± 0.3[6] M☉ |
| Radius | 5.5 ± 0.5[6] R☉ |
| Luminosity | 851[6] L☉ |
| Surface gravity (log g) | 3.64 ± 0.05[6] cgs |
| Temperature | 14,552[7] K |
| Metallicity [Fe/H] | 0.09±0.04[5] dex |
| Rotational velocity (v sin i) | 55[8] km/s |
| Age | 100 ± 8[6] Myr |
| Other designations | |
Al Thalimain, ι Aql, 41 Aql, BD-01° 3782, HD 184930, HIP 96468, HR 7447, SAO 143597.[9] | |
| Database references | |
| SIMBAD | data |
Iota Aquilae, Latinized from ι Aquilae, is the Bayer designation for a star in the equatorial constellationofAquila. It has the traditional name Al Thalimain /ælˌθælɪˈmeɪn/, which it shares with λ Aquilae. The name is derived from the Arabic term الظليمین al-ẓalīmayn meaning "The Two Ostriches".[citation needed] With an apparent visual magnitude of 4.364,[2] this star is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 8.34 ± 0.79 mas,[1] it is located at a distance of around 390 light-years (120 parsecs) from Earth. At that distance, the visual magnitude of the star is diminished by 0.15[6] from extinction caused by intervening gas and dust.
Although Iota Aquilae is listed in star catalogues as a giant star, calculations of its dimension show that in reality it is a main-sequence star.[10] It has nearly five times the mass of the Sun and five to six times the Sun's radius.[6] It is emitting 851[6] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 14,552 K,[7] giving it the blue-white hue of a B-type star. The projected rotational velocity of this star is 55 km/s.[8] Even though it is only around 100 million years old, it has already spent 91% of its allotted lifetime on the main sequence.[6]
InChinese, 右旗 (Yòu Qí), meaning Right Flag, refers to an asterism consisting of ι Aquilae, μ Aquilae, σ Aquilae, δ Aquilae, ν Aquilae, 42 Aquilae, HD 184701, κ Aquilae and 56 Aquilae.[11] Consequently, the Chinese name for ι Aquilae itself is 右旗五 (Yòu Qí wu, English: the Fifth Star of Right Flag.)[12]
This star, together with η Aql, θ Aql, δ Aql, κ Aql and λ Aql were once part of the obsolete constellation Antinous.[13]
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