66 Aquarii

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title: "66 Aquarii" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["k-type-giants", "suspected-variables", "aquarius-(constellation)", "durchmusterung-objects", "bayer-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Star in the constellation Aquarius" topic_path: "general/k-type-giants" source: "https://en.wikipedia.org/wiki/66_Aquarii" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Aquarius ::

| name = 66 Aquarii | 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 66 Aquarii (circled) | epoch = J2000 | ra = | dec = | appmag_v = 4.673 | constell = Aquarius | class = K3 III | b-v = +1.376 | u-b = +1.549 | variable = suspected | radial_v = +21.6 | prop_mo_ra = −31.73 | prop_mo_dec = −28.54 | parallax = 7.53 | p_error = 0.26 | parallax_footnote = | absmag_v = −0.93 | mass = | radius = 37 | luminosity = 434.08 | temperature = 4,170 | metal_fe = −0.23 | gravity = 2.06 | rotational_velocity = 10 | age_myr = | names= |Simbad=66+Aqr

66 Aquarii is a single It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.673. Based upon an annual parallax shift of 7.53 milliarcseconds, the distance to this star is about 430 ly.

This is an evolved giant star with a stellar classification of K3 III. It has expanded to 37 times the radius of the Sun and is radiating 434 times the luminosity of the Sun from its outer envelope at an effective temperature of 4,170 K. This gives it the orange-hued glow of a K-type star. It is a suspected variable star that ranges in magnitude between 4.66 and 4.71.

References

| title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 | bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}

| 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. [[star]] in the [[Celestial equator. equatorial]] [[constellation]] of [[Aquarius (constellation)
2. van Leeuwen, F.. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
3. McWilliam, Andrew. (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series.
4. (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Dept. of Astronomy, University of Michigan.
5. Wilson, Ralph Elmer. (1953). "General catalogue of stellar radial velocities". [[Carnegie Institution of Washington]].
6. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago.
7. (September 1975). "A new photometric metal abundance and luminosity calibration for field G and K giants.". [[Monthly Notices of the Royal Astronomical Society]].
8. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics.
9. "* g Aqr".
10. (December 1998). "New Catalogue of Suspected Variable Stars. Supplement". Information Bulletin on Variable Stars.
11. (December 21, 2004). "The Colour of Stars". [[Commonwealth Scientific and Industrial Research Organisation]].

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