Alpha Octantis

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Binary star system in the constellation Octans

title: "Alpha Octantis" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["f-type-giants", "spectroscopic-binaries", "circumstellar-disks", "beta-lyrae-variables", "octans", "bayer-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Binary star system in the constellation Octans" topic_path: "general/f-type-giants" source: "https://en.wikipedia.org/wiki/Alpha_Octantis" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Binary star system in the constellation Octans ::

| image = |image=Octans constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=α Octantis |x=620|y=332 | caption = Location of α Octantis (circled in red) | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Octans | ra = | dec = | appmag_v=5.13 | type = Main sequence | class = F4III + F5III | u-b = +0.13 | b-v = | variable = EB | radial_v = | prop_mo_ra = +22.5215 | prop_mo_dec = −369.325 | parallax = 22.5215 | p_error = 0.0955 | parallax_footnote = | absmag_v= | reference= | period_unitless=9.073 d | k1=47 | k2=47 | periastron=2,435,302.404 | eccentricity=0.39 | periarg=276 | source = | component1 = A | mass = 1.9 | radius = 2.0 | luminosity = 7 | temperature = 6,700 | age_gyr = 1.1 | component2 = B | mass2 = 2 | radius2 = 2.0 | luminosity2 = 7 | temperature2 = 6,700 | age_gyr2 = 1.1 | names= | Simbad=alf+Oct

Alpha Octantis is a binary star system in the constellation of Octans. The name is Latinized from α Octantis. Despite being labeled the "alpha" star by Lacaille, it is not the brightest star in the constellation—that title belongs to Nu Octantis. It is also the faintest "alpha" star overall, with Alpha Mensae a close second. It is visible to the naked eye as a faint, yellow-white-hued point of light with an overall apparent visual magnitude of approximately 5.13. The system is located approximately 148 light-years away from the Sun based on parallax.

::figure[src="https://upload.wikimedia.org/wikipedia/commons/0/02/AlphaOctLightCurve.png" caption="TESS]]'' data"] ::

This is a double-lined spectroscopic binary star which consists of two similar main sequence stars, each with spectral type F,

References

References

  1. {{cite DR2. 5330765974462198784
  2. The double-lined binary alpha Octantis, William Buscombe and Pamela M. Morris, ''The Observatory'' '''80''' (February 1960), pp. 28–29, {{Bibcode. 1960Obs....80...28B.
  3. CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line September 4, 2008.
  4. (2017). "General catalogue of variable stars". Astronomy Reports.
  5. (2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs". Astronomy and Astrophysics.
  6. "* alf Oct".
  7. (2007). "DEBRIS DISKS IN MAIN-SEQUENCE BINARY SYSTEMS". The Astrophysical Journal.
  8. Asensio-Torres, R.. (2018-11-01). "SPOTS: The Search for Planets Orbiting Two Stars - III. Complete sample and statistical analysis". Astronomy & Astrophysics.
  9. "Alpha Octantis".
  10. Ridpath, Ian. "Star Tales – Octans".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

f-type-giantsspectroscopic-binariescircumstellar-disksbeta-lyrae-variablesoctansbayer-objectsdurchmusterung-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objects