38 Aquarii

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title: "38 Aquarii" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["aquarius-(constellation)", "b-type-giants", "bayer-objects", "flamsteed-objects", "hipparcos-objects", "henry-draper-catalogue-objects", "bright-star-catalogue-objects", "durchmusterung-objects"] description: "Star in the constellation Aquarius" topic_path: "general/aquarius-constellation" source: "https://en.wikipedia.org/wiki/38_Aquarii" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Aquarius ::

| image = [[File:Aquarius IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings]] [[File:Cercle rouge 100%.svg|12px]] | caption = Location of 38 Aquarii (circled) | epoch = J2000.0 (ICRS) | ra = | dec = | appmag_v = +5.43 | constell = Aquarius | class = B5 III | b-v = −0.12 | u-b = | variable = | radial_v = +1.5 | prop_mo_ra = +29.29 | prop_mo_dec = +8.76 | parallax = 7.25 | p_error = 0.33 | parallax_footnote = | absmag_v = −0.26 | component1 = | mass = | radius = 5.6 | luminosity = 219.16 | temperature = 13,860 | metal_fe = –0.26 | gravity = 4.00 | rotational_velocity = 20 | age_myr = | names = |Simbad=38+Aqr

38 Aquarii is a star in the equatorial constellation of Aquarius. 38 Aquarii is its Flamsteed designation; its Bayer designation is e Aquarii. It is a faint star but visible to the naked eye, with an apparent visual magnitude of +5.43. Based on parallax measurements, it is around 450 ly away; it is 0.28 degree south of the ecliptic.

The spectrum of 38 Aquarii matches a stellar classification of B5 III. A luminosity class of III indicates that this is an evolved giant star. It has 5.6 times the radius of the Sun and is spinning with a projected rotational velocity of 20 km/s. The outer atmosphere of the star has a blue-white glow from an effective temperature of 13,860 K.

References

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

References

1. van Leeuwen, F.. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
2. (January 2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". [[Monthly Notices of the Royal Astronomical Society]].
3. (1999). "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions". Astronomisches Rechen-Institut Heidelberg.
4. (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal.
5. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of Southern Africa.
6. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics.
7. "* e Aqr".

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