Iota Aquilae

Iota Aquilae
Diagram showing star positions and boundaries of the Aquila constellation and its surroundings
Location of ι Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 36m 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]
Distance390 ± 40 ly
(120 ± 10 pc)
Absolute magnitude (MV)−1.01[5]
Details
Mass4.8 ± 0.3[6] M☉
Radius5.5 ± 0.5[6] R☉
Luminosity851[6] L☉
Surface gravity (log g)3.64 ± 0.05[6] cgs
Temperature14,552[7] K
Metallicity [Fe/H]0.09±0.04[5] dex
Rotational velocity (v sin i)55[8] km/s
Age100 ± 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
SIMBADdata

Iota Aquilae, Latinized from ι Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. 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".[10] 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.[11] 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]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aass61_387 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference apjs17_371 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h i Cite error: The named reference mnras333_1_9 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference mnras189_601 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ "Patronage for Star #96165 | Patronize a star | OpenSea".
  11. ^ Cite error: The named reference kaler was invoked but never defined (see the help page).