F Eridani

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Multiple star system in the constellation Eridanus

title: "F Eridani" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["eridanus-(constellation)", "bayer-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects", "suspected-variables", "binary-stars", "b-type-main-sequence-stars", "a-type-main-sequence-stars"] description: "Multiple star system in the constellation Eridanus" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/F_Eridani" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Multiple star system in the constellation Eridanus ::

| name = f Eridani | image= |image=Eridanus constellation map.svg|alt=|float=center|width=260 |label=|position=right |mark=Red circle.svg|mark_width=8|mark_link=f Eridani |x=496|y=750 |caption=Location of f Eridani (circled) | epoch = J2000 | constell = Eridanus | component1 = HD 24072 | ra1 = | dec1 = | appmag_v1 = | component2 = HD 24071 | ra2 = | dec2 = | appmag_v2 = | component1 = HD 24072 | type = main sequence | class = B9.5 Van | b-v = | component2 = HD 24071 | type2 = main sequence | class2 = A1 Va | b-v2 = | variable2 = suspected | component1 = HD 24072 | radial_v = | prop_mo_ra = +81.136 | prop_mo_dec = −6.795 | parallax = 18.8093 | p_error = 0.2220 | parallax_footnote = | absmag_v = | component2 = HD 24071 | radial_v2 = | prop_mo_ra2 = +63.372 | prop_mo_dec2 = −8.121 | parallax2 = 18.7976 | p_error2 = 0.0582 | parallax_footnote2 = | absmag_v2 = | source = | component1 = HD 24072 | mass = 2.6 | radius = 2.0 | luminosity = 35 | gravity = 4.26 | temperature = 10,046 | metal_fe = −0.49 | rotational_velocity = 225 | age_myr = | component2 = HD 24071 | mass2 = 2.1 | luminosity2 = 20 | temperature2 = 9,503 | radius2 = 1.7 | gravity2 = 4.16 | metal_fe2 = −0.54 | rotational_velocity2 = 39 | age_myr2 = | names = | component1 = A | names1 = | component2 = B | names2 = | Simbad = HIP+17797 | Simbad2 = HD+24072|sn2=HD 24072 | Simbad3 = HD+24071|sn3=HD 24071

f Eridani is a binary, or possibly a triple, star system in the equatorial constellation of Eridanus, consisting of stars HD 24071 and HD 24072. They share a single Hipparcos catalogue entry, HIP 17797, but have separate Bright Star Catalogue listings, HR 1189 and 1190. f Eridani is the Bayer designation of the pair.

f Eridani is visible to the naked eye as a single star with a magnitude of 4.25. HD 24071 has an apparent visual magnitude of 5.25 and HD 24072 a magnitude of 4.72. As of 2009, the pair had an angular separation of along a position angle of 216°. Both stars have an annual parallax shift , which provides a distance estimate to the system of 173 light years. The pair are members of the Tucana-Horologium moving group, a 45 million year old set of stars that share a common motion through space.

The brighter component, HD 24072, is a B-type main-sequence star with a classification of B9.5 Van. The n suffix indicates "nebulous" absorption lines which are caused by its rapid rotation. It has a projected rotational velocity of 225 km/s.

HD 24071 may itself be a spectroscopic binary. The visible component is an A-type main-sequence star with a stellar classification of A1 Va. It is a suspected variable star of unknown type showing an amplitude of 0.05 magnitude, and is a source of X-ray emission, which may originate from a companion of class G2-5V.

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 | page=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=. | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}

| title=The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation | last1=Gray | first1=R. O. | last2=Garrison | first2=R. F. | journal=Astrophysical Journal Supplement | volume=65 | page=581 | date=December 1987 | doi=10.1086/191237 | bibcode=1987ApJS...65..581G | doi-access=free }}

| title=A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood | display-authors=1 | last1=Bell | first1=Cameron P. M. | last2=Mamajek | first2=Eric E. | last3=Naylor | first3=Tim | journal=Monthly Notices of the Royal Astronomical Society | volume=454 | issue=1 | pages=593–614 | date=November 2015 | doi=10.1093/mnras/stv1981 | doi-access=free | bibcode=2015MNRAS.454..593B | arxiv=1508.05955 | s2cid=55297862 | postscript=. }}

| display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 |date=October 2002 | doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255 | s2cid=14070763 | postscript=. }}

| title=X-ray emission from A-type stars | last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M. | journal=Astronomy and Astrophysics | postscript=. | volume=475 | issue=2 | date=November 2007 | pages=677–684 | doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S | doi-access=free }}

| title=On the Variability of A0-A2 Luminosity Class III-V Stars | display-authors=1 | last1=Adelman | first1=S. J. | last2=Flores | first2=R. S. C. Jr. | last3=Patel | first3=V. J. | journal=Information Bulletin on Variable Stars | volume=4984 | page=1 | date=November 2000 | bibcode=2000IBVS.4984....1A | postscript=. }}

| display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. | last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. | title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }}

References

  1. "f Eri".
  2. "HD 24072".
  3. "HD 24071".
  4. {{cite Gaia DR3. 4856719713756945664
  5. {{cite Gaia DR3. 4856719713756946176
  6. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers.
  7. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics.
  8. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal.
  9. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics.

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eridanus-(constellation)bayer-objectsdurchmusterung-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objectssuspected-variablesbinary-starsb-type-main-sequence-starsa-type-main-sequence-stars