8 Cygni

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Star in the constellation Cygnus

title: "8 Cygni" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["b-type-subgiants", "cygnus-(constellation)", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Star in the constellation Cygnus" topic_path: "general/b-type-subgiants" source: "https://en.wikipedia.org/wiki/8_Cygni" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Cygnus ::

| image = |image=Cygnus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=8 Cygni |x=615|y=555 | caption = Location of 8 Cygni (circled in red) | epoch=J2000 | constell=Cygnus | ra= | dec= | appmag_v=4.75 | class=B3 IV | b-v=−0.155 | u-b= | radial_v= | prop_mo_ra=1.16 | prop_mo_dec=−3.47 | parallax=3.79 | p_error=0.16 | parallax_footnote= | absmag_v = −2.21 | mass = 6.1 | radius = 6.50{{citation | display-authors=1 | last1=Challouf | first1=M. | last2=Nardetto | first2=N. | last3=Mourard | first3=D. | last4=Graczyk | first4=D. | last5=Aroui | first5=H. | last6=Chesneau | first6=O. | last7=Delaa | first7=O. | last8=Pietrzyński | first8=G. | last9=Gieren | first9=W. | last10=Ligi | first10=R. | last11=Meilland | first11=A. | last12=Perraut | first12=K. | last13=Tallon-Bosc | first13=I. | last14=McAlister | first14=H. | last15=Ten Brummelaar | first15=T. | last16=Sturmann | first16=J. | last17=Sturmann | first17=L. | last18=Turner | first18=N. | last19=Farrington | first19=C. | last20=Vargas | first20=N. | last21=Scott | first21=N. | title=Improving the surface brightness-color relation for early-type stars using optical interferometry⋆ | journal=Astronomy & Astrophysics | postscript=. | volume=570 | pages=A104 | year=2014 | arxiv=1409.1351 | doi=10.1051/0004-6361/201423772 | bibcode=2014A&A...570A.104C | s2cid=14624307 }} | luminosity = 2,291 | temperature = 16,300 | gravity = 3.58 | metal_fe = +0.25 | rotational_velocity = 55 | age_myr = 53 | names=8 Cygni, BD+34°3590, HD 184171, HIP 96052, HR 7426, SAO 68447. |Simbad=8+Cyg}}

8 Cygni is a single star in the northern constellation of Cygnus. Based upon its parallax of 3.79 mas, it is approximately 860 light-years (260 parsecs) away from Earth. It is visible to the naked eye as a faint, bluish-white hued star with an apparent visual magnitude of about 4.7. The star is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.

This is an aging subgiant star, as indicated by its spectral type of B3IV.

References

(2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
Lesh, Janet Rountree. (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". Astrophysical Journal Supplement.
(1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data.
Gontcharov, G. A.. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
(2024). "Boron depletion in Galactic early B-type stars reveals two different main sequence star populations". Astronomy and Astrophysics.
(September 2008). "A catalogue of multiplicity among bright stellar systems". [[Monthly Notices of the Royal Astronomical Society]].
(June 1998). "Elemental abundance analyses with DAO spectrograms - XIX. The superficially normal B stars zeta Draconis, epsilon Lyrae, 8 Cygni and 22 Cygni". Monthly Notices of the Royal Astronomical Society.

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