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24 Aquilae information


24 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 18m 50.94777s[1]
Declination 00° 20′ 20.5448″[1]
Apparent magnitude (V) 6.423[2]
Characteristics
Spectral type K0-IIIa:CH1Ba0.5[3]
U−B color index +0.770[2]
B−V color index +1.050[2]
Astrometry
Radial velocity (Rv)−26.13±0.15[1] km/s
Proper motion (μ) RA: +10.755[1] mas/yr
Dec.: +11.298[1] mas/yr
Parallax (π)7.5115 ± 0.0437 mas[1]
Distance434 ± 3 ly
(133.1 ± 0.8 pc)
Absolute magnitude (MV)+0.64[4]
Details
Mass2.2[4] M
Radius11.17+0.32
−0.70
[1] R
Luminosity56.397±0.468[1] L
Surface gravity (log g)2.48[5] cgs
Temperature4,733+155
−67
[1] K
Metallicity [Fe/H]−0.19±0.06[5] dex
Age0.5[4] Gyr
Other designations
BD+00 4170, HD 181053, HIP 94913, HR 7321, SAO 124492[6]
Database references
SIMBADdata

24 Aquilae (abbreviated 24 Aql) is a star in the equatorial constellation of Aquila. 24 Aquilae is its Flamsteed designation. It is located at a distance of around 434 light-years (133 parsecs)[1] from Earth and has an apparent visual magnitude of 6.4.[2] According to the Bortle Dark-Sky Scale, this star is just visible to the naked eye in dark rural skies. It is drifting closer to the Sun with a radial velocity of −26 km/s.[1]

This is a so-called mild barium star, as identified by the presence of a weak absorption line of singly-ionized barium atoms at a wavelength of 455.4 nm. Such stars display an atmospheric overabundance of carbon and the heavy elements produced by the s-process, which was most likely transferred into the atmosphere by a wide binary stellar companion. However, in the case of 24 Aquilae, the abundances of heavy elements are near normal.[4]

At an estimated age of a half billion years,[4] 24 Aquilae is a evolved giant star with a stellar classification of K0 IIIa.[4] It has more than double the mass of the Sun, 11 times the Sun's radius, and shines with 56 times the Sun's luminosity.[1] It is radiating this energy into space from its outer atmosphere at an effective temperature of 4,733 K.[1] This heat is what gives it the cool orange hue characteristic of a K-type star.[7]

  1. ^ a b c d e f g h i j k l m Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Keenan_McNeil_1989 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference aaa468_2_679 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference aaa515_A11 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).

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