Psi Aquilae

Psi Aquilae
Location of ψ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 44m 34.19086s[1]
Declination +13° 18′ 10.0063″[1]
Apparent magnitude (V) 6.25[2]
Characteristics
Spectral type B9 III-IV[3]
U−B color index –0.22[4]
B−V color index –0.04[4]
Astrometry
Radial velocity (Rv)–18.3[5] km/s
Proper motion (μ) RA: +0.561[1] mas/yr
Dec.: –9.950[1] mas/yr
Parallax (π)2.8253 ± 0.0752 mas
Distance1,150 ± 30 ly
(354 ± 9 pc)
Absolute magnitude (MV)−1.17[6]
Details
Radius3.7[7] R☉
Luminosity341[6] L☉
Temperature10,814±232[8] K
Rotational velocity (v sin i)20[9] km/s
Age~247[10] Myr
Other designations
ψ Aql, 48 Aquilae, BD+12° 4059, HD 186547, HIP 97139, HR 7511, SAO 105199[2]
Database references
SIMBADdata

Psi Aquilae, Latinized as ψ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. It is a faint star with an apparent visual magnitude of 6.25,[2] which, according to the Bortle Dark-Sky Scale, can be seen with the naked eye in dark rural skies. The orbit of the Earth causes an annual parallax shift of 2.83 mas,[1] which indicates a distance of approximately 1,150 light-years (350 parsecs).

The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV,[3] with the luminosity class of III-IV indicating the spectrum lies part way between that of a subgiant and a giant star. The effective temperature of the star's outer atmosphere is 10,814 K,[8] giving it the blue-white hue of a B-type star.[11] It has nearly four[7] times the radius of the Sun and has a projected rotational velocity of 20 km/s.[9]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aj77_750 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference apj137_530 was invoked but never defined (see the help page).
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  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference aaa444_3_941 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).