Psi Aquilae

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title: "Psi Aquilae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["b-type-giants", "aquila-(constellation)", "bayer-objects", "bright-star-catalogue-objects", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects"] description: "Star in the constellation Aquila" topic_path: "general/b-type-giants" source: "https://en.wikipedia.org/wiki/Psi_Aquilae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Aquila ::

| image = | image=Aquila IAU.svg | float=center | width=240 | position=right | mark=Red circle.svg | mark_width=10 | mark_link=ψ Aql | x%=49.5 | y%=23.4 | caption = Location of ψ Aquilae (circled) | epoch = J2000 | constell = Aquila | ra = | dec = | appmag_v = 6.25 | class = B9 III-IV | b-v = −0.04 | u-b = −0.22 | r-i = | v-r = | variable = | radial_v = −19.7 | prop_mo_ra = +0.561 | prop_mo_dec = −9.950 | pm_footnote = | parallax = 2.8253 | p_error = 0.0752 | parallax_footnote = | absmag_v = −1.17 | mass = 3.8 | radius = 6.5 | luminosity = 506 | temperature = 10,167 | metal_fe = 0.21 | gravity = 3.41 | rotation = 7.1 days | rotational_velocity = 20 | age_myr = ~247 | names = | Simbad = psi+Aql

Psi Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from ψ Aquilae, and abbreviated Psi Aql or ψ Aql. This is a faint star with an apparent visual magnitude of 6.25, 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 , which indicates a distance of approximately 1150 ly. It is drifting closer to the Sun with a radial velocity of −20 km/s.

The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV, 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 , giving it the blue-white hue of a B-type star. It has nearly four times the mass of the Sun, 6.5 times its radius, and has a projected rotational velocity of 20 km/s.

References

| title=psi Aql | access-date=2012-07-21 | postscript=. | mode = cs2 }}

| title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

| title=Rotational Velocities of B Stars | display-authors=1 | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | journal=The Astrophysical Journal | volume=573 | issue=1 | pages=359–365 | date=July 2002 | doi=10.1086/340590 | doi-access=free | bibcode=2002ApJ...573..359A }}

| title=Spatial distribution and kinematics of OB stars | last=Gontcharov | first=G. A. | journal=Astronomy Letters | volume=38 | issue=11 | pages=694–706 | date=November 2012 | doi=10.1134/S1063773712110035 | bibcode=2012AstL...38..694G | arxiv=1606.09028 | s2cid=119108982 | postscript=. }}

| title=Pulkovo compilation of radial velocities for 35495 stars in a common system | last=Gontcharov | first=G. A. | journal=Astronomy Letters | date=2006 | volume=32 | issue=11 | pages=759–771 | doi=10.1134/S1063773706110065 | arxiv=1606.08053 | bibcode=2006AstL...32..759G | s2cid=119231169 }}

References

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4. (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal.
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6. Cowley, A.. (November 1972). "Spectral classification of the bright B8 stars". Astronomical Journal.
7. Crawford, D. L.. (February 1963). "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars". Astrophysical Journal.
8. (December 21, 2004). "The Colour of Stars". Commonwealth Scientific and Industrial Research Organisation.

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