Eta Octantis: Difference between revisions

η Octantis
	Location of η Octantis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Octans
Right ascension	10h 59m 13.7578s
Declination	−84° 35′ 38.0177″
Apparent magnitude (V)	6.18±0.01
Characteristics
Evolutionary stage	main sequence
Spectral type	A1 Va
U−B color index	+0.12
B−V color index	+0.11
Astrometry
Radial velocity (Rv)	−1.7±0.6 km/s
Proper motion (μ)	RA: −65.747 mas/yr ; Dec.: −8.273 mas/yr
Parallax (π)	9.1133 ± 0.02 mas
Distance	357.9 ± 0.8 ly ; (109.7 ± 0.2 pc)
Absolute magnitude (MV)	+1.08
Details
Mass	2.37±0.03 M☉
Radius	2.6±0.1 R☉
Luminosity	45.3+3.1; −3.0 L☉
Surface gravity (log g)	4.1 cgs
Temperature	9,500 K
Metallicity [Fe/H]	−0.01 dex
Rotational velocity (v sin i)	152±13 km/s
Age	547 Myr
Other designations
	η Oct, 11 G. Octantis[12], CPD−83°386, FK5 1664, GC 15164, HD 96124, HIP 53702, HR 4312, SAO 258600
Database references
SIMBAD	data

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Eta Octantis, Latinized from η Octantis, is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.19,^[2] making it faintly visible to the naked eye. The object is situated at a distance of 358 light years^[1] but is approaching the Solar System with a heliocentric radial velocity of −1.7 km/s.^[6]

Eta Octantis has a stellar classification of A1 Va,^[4] indicating that it is an ordinary A-type main sequence star. At present it has 2.37 times the Sun's mass^[3] and 2.6 times the Sun's radius.^[8] It shines with a luminosity of 45 L_☉^[3] from its photosphere at an effective temperature of 9,500 K, giving a white hue.^[9] Eta Octantis is a rapidly rotating star, with a projected rotational velocity of 152 km/s,^[11] and is estimated to be 547 million years old,^[10] having completed 72% of its main sequence lifetime.^[3]

References

^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
^ ^a ^b ^c ^d ^e ^f Zorec, J.; Royer, F. (1 January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
^ ^a ^b Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics. 373 (2): 625–632. Bibcode:2001A&A...373..625P. doi:10.1051/0004-6361:20010630. eISSN 1432-0746. ISSN 0004-6361.
^ ^a ^b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
^ ^a ^b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
^ ^a ^b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
^ ^a ^b ^c Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv:1009.0137. Bibcode:2010SPIE.7734E..4EL. doi:10.1117/12.857024. S2CID 32097037.
^ ^a ^b ^c Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108.
^ ^a ^b Reiners, A.; Royer, F. (February 2004). "First signatures of strong differential rotation in A-type stars". Astronomy & Astrophysics. 415 (1): 325–329. arXiv:astro-ph/0311341. Bibcode:2004A&A...415..325R. doi:10.1051/0004-6361:20034175. eISSN 1432-0746. ISSN 0004-6361.
^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
^ "eta Oct". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 25, 2022.

[EDR3-1] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[Tycho2000-2] Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[Zorec2012-3] ^ ^a ^b ^c ^d ^e ^f Zorec, J.; Royer, F. (1 January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.

[Paunzen2001-4] Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics. 373 (2): 625–632. Bibcode:2001A&A...373..625P. doi:10.1051/0004-6361:20010630. eISSN 1432-0746. ISSN 0004-6361.

[Johnson1966-5] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[Gontcharov2006-6] Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.

[Anderson2012-7] Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.

[Stassun2019-8] Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.

[Lafrasse2010-9] Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv:1009.0137. Bibcode:2010SPIE.7734E..4EL. doi:10.1117/12.857024. S2CID 32097037.

[Gontcharov2012-10] Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108.

[Reiners2004-11] Reiners, A.; Royer, F. (February 2004). "First signatures of strong differential rotation in A-type stars". Astronomy & Astrophysics. 415 (1): 325–329. arXiv:astro-ph/0311341. Bibcode:2004A&A...415..325R. doi:10.1051/0004-6361:20034175. eISSN 1432-0746. ISSN 0004-6361.

[Gould1879-12] Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.

[SIMBAD-13] "eta Oct". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 25, 2022.

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@@ Line 15: / Line 15: @@
 | epoch               = J2000
 | constell            = [[Octans]]
-| ra                  = {{RA|10|59|13.757}}<ref name = GaiaDR2/>
+| ra                  = {{RA|10|59|13.7578}}<ref name = EDR3/>
-| dec                 = {{DEC|-84|35|38.02}}<ref name = GaiaDR2/>
+| dec                 = {{DEC|-84|35|38.0177}}<ref name = EDR3/>
 | appmag_v            = 6.18{{±|0.01}}<ref name = Tycho2000/>
 }}
 {{Starbox character
-| class               = A1 V<ref name = Houk1975/>
+| type                = [[main sequence]]<ref name = Zorec2012/>
+| class               = A1 Va<ref name = Paunzen2001/>
 | u-b                 = +0.12<ref name = Johnson1966/>
 | b-v                 = +0.11<ref name = Johnson1966/>
 }}
 {{Starbox astrometry
-| radial_v            = {{val|-47.69|0.02}}<ref name = Buder2019/>
+| radial_v            = −1.7{{±|0.6}}<ref name = Gontcharov2006/>
-| prop_mo_ra          = −65.708
+| prop_mo_ra          = −65.747
-| prop_mo_dec         = −8.177
+| prop_mo_dec         = −8.273
-| pm_footnote         = <ref name =GaiaDR2/>
+| pm_footnote         = <ref name = EDR3/>
-| parallax            = 9.1394
+| parallax            = 9.1133
-| p_error             = 0.0384
+| p_error             = 0.02
-| parallax_footnote   = <ref name = GaiaDR2/>
+| parallax_footnote   =  <ref name = EDR3/>
-| absmag_v            = +1.08<ref name = XHIP/>
+| absmag_v            = +1.08<ref name = Anderson2012/>
 }}
 {{Starbox detail
 | mass                = {{val|2.37|0.03}}<ref name = Zorec2012/>
 | luminosity          = {{val|45.3|3.1|3.0}}<ref name = Zorec2012/>
-| temperature         = {{val|8974|167|164|fmt=commas}}<ref name = Zorec2012/>
+| temperature         = 9,500<ref name = Lafrasse2010/>
-| rotational_velocity = 150<ref name = Zorec2012/>
+| rotational_velocity = 152{{±|13}}<ref name = Reiners2004/>
-| age_myr             = {{val|376|22}}<ref name = Zorec2012/>
+| age_myr             = 547<ref name = Gontcharov2012/>
-| radius              = {{val|2.60|0.07|0.10}}<ref name = TIC/>
+| radius              = 2.6{{±|0.1}}<ref name = Stassun2019/>
-| gravity             = {{val|3.96|0.05|0.10}}<ref name = TIC/>
+| gravity             = 4.1<ref name = Lafrasse2010/>
-| metal_fe            = −0.21<ref name = Anders2019/>
+| metal_fe            = −0.01<ref name = Gontcharov2012/>
 }}
 {{Starbox catalog
-| names = {{odlist|B = η Octantis|HD = 96124|HIP = 53702|CPD = -83 386|HR = 4312|SAO = 258600}}
+| names = {{odlist|B = η Oct|HD = 96124|HIP = 53702|CPD = −83°386|HR = 4312|SAO = 258600|FK5 = 1664|GC = 15164|Gould = 11 G. Octantis<ref name = Gould1879/>}}<ref name = SIMBAD/>
 }}
 {{Starbox reference
@@ Line 52: / Line 53: @@
 {{Starbox end}}
-'''Eta Octantis''', Latinized from '''η Octantis''', is a solitary star located in the southern [[circumpolar constellation]] [[Octans]]. With an [[apparent magnitude]] of about 6.19, it's barely visible to the [[naked eye]] under ideal conditions. The Star is located approximately {{convert|357|ly|pc}} away from the [[Solar System]], but is drifting closer with a heliocentric [[radial velocity]] of -47.69&nbsp;km/s.
+'''Eta Octantis''', Latinized from '''η Octantis''', is a solitary [[star]] located in the southern [[circumpolar constellation]] [[Octans]]. It has an [[apparent magnitude]] of 6.19,<ref name = Tycho2000/> making it faintly visible to the [[naked eye]]. The object is situated at a distance of 358 [[light year]]s<ref name = EDR3/> but is approaching the [[Solar System]] with a heliocentric [[radial velocity]] of {{val|-1.7|ul=km/s}}.<ref name = Gontcharov2006/>
-Eta Octantis is an [[A-type main sequence star]] with 2.37 times the [[Solar mass|Sun's mass]] and 2.6 times the [[Solar radius|Sun's radius]]. It radiates at 45.3 [[Solar luminosity|solar luminosities]] from its [[photosphere]] at an [[effective temperature]] of 8,974 [[Kelvin|K]]. Eta Octantis is a rapidly rotating star, with a [[projected rotational velocity]] of 150&nbsp;km/s, and is estimated to be 376 [[million years]] old, having completed about 70% of its life time.
+Eta Octantis has a [[stellar classification]] of A1 Va,<ref name = Paunzen2001/> indicating that it is an ordinary [[A-type main sequence star]]. At present it has 2.37 times the [[Solar mass|Sun's mass]]<ref name = Zorec2012/> and 2.6 times the [[Solar radius|Sun's radius]].<ref name = Stassun2019/> It shines with a [[luminosity]] of {{val|45|ul=solar luminosity}}<ref name = Zorec2012/> from its [[photosphere]] at an [[effective temperature]] of 9,500 [[Kelvin|K]], giving a white hue.<ref name = Lafrasse2010/> Eta Octantis is a rapidly rotating star, with a [[projected rotational velocity]] of {{val|152|ul=km/s}},<ref name = Reiners2004/> and is estimated to be 547 [[million years]] old,<ref name = Gontcharov2012/> having completed 72% of its [[main sequence]] lifetime.<ref name = Zorec2012/>
 ==References==
 {{reflist||refs=
-<ref name = GaiaDR2>{{Cite DR2|5191251074311205888}}</ref>
+<ref name = EDR3>{{Cite Gaia EDR3|5191251074311205888}}</ref>
 <ref name = Johnson1966>{{cite journal |last1=Johnson |first1=H. L. |last2=Mitchell |first2=R. I. |last3=Iriarte |first3=B. |last4=Wisniewski |first4=W. Z. |title=UBVRIJKL Photometry of the Bright Stars |journal=Communications of the Lunar and Planetary Laboratory |date=1966 |volume=4 |pages=99–110 |bibcode=1966CoLPL...4...99J}}</ref>
-<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=1 March 2000 |volume=355 |pages=L27–L30 |bibcode=2000A&A...355L..27H |issn=0004-6361}}</ref>
+<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>
-<ref name = Houk1975>{{cite journal |last1=Houk |first1=N. |last2=Cowley |first2=A. P. |title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_f0. |journal=University of Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume I. Declinations -90_ to -53_f0., by Houk, N.; Cowley, A. P.. Ann Arbor, MI (USA): Department of Astronomy, University of Michigan, 19 + 452 P. |date=1975 |bibcode=1975mcts.book.....H }}</ref>
+<ref name = Paunzen2001>{{cite journal | last1 = Paunzen | first1 = E. | last2 = Duffee | first2 = B. | last3 = Heiter | first3 = U. | last4 = Kuschnig | first4 = R. | last5 = Weiss | first5 = W. W. | title = A spectroscopic survey for <i>λ</i> Bootis stars | journal = Astronomy &amp; Astrophysics | date = July 2001 | volume = 373 | issue = 2 | pages = 625–632 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20010630 | bibcode = 2001A&A...373..625P | doi-access = free}}</ref>
+<ref name = Gontcharov2006>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>
-<ref name = Buder2019>{{cite journal |display-authors=1 |last1=Buder |first1=S. |last2=Lind |first2=K. |last3=Ness |first3=M. K. |last4=Asplund |first4=M. |last5=Duong |first5=L. |last6=Lin |first6=J. |last7=Kos |first7=J. |last8=Casagrande |first8=L. |last9=Casey |first9=A. R. |last10=Bland-Hawthorn |first10=J. |last11=de Silva |first11=G. M. |last12=D'Orazi |first12=V. |last13=Freeman |first13=K. C. |last14=Martell |first14=S. L. |last15=Schlesinger |first15=K. J. |last16=Sharma |first16=S. |last17=Simpson |first17=J. D. |last18=Zucker |first18=D. B. |last19=Zwitter |first19=T. |last20=Cotar |first20=K. |last21=Dotter |first21=A. |last22=Hayden |first22=M. R. |last23=Hyde |first23=E. A. |last24=Kafle |first24=P. R. |last25=Lewis |first25=G. F. |last26=Nataf |first26=D. M. |last27=Nordlander |first27=T. |last28=Reid |first28=W. |last29=Rix |first29=H.-W. |last30=Skúladóttir |first30=Á. |last31=Stello |first31=D. |last32=Ting |first32=Y.-S. |last33=Traven |first33=G. |last34=Wyse |first34=R. F. G. |title=The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS |journal=Astronomy and Astrophysics |date=1 April 2019 |volume=624 |pages=A19 |doi=10.1051/0004-6361/201833218 |arxiv=1804.05869 |bibcode=2019A&A...624A..19B |s2cid=102485610 |issn=0004-6361}}</ref>
-<ref name = XHIP>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=1 May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |arxiv=1108.4971 |bibcode=2012AstL...38..331A |s2cid=119257644 |issn=1063-7737}}</ref>
+<ref name = Anderson2012>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971|s2cid=119257644 }}</ref>
 <ref name = Zorec2012>{{cite journal |last1=Zorec |first1=J. |last2=Royer |first2=F. |title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities |journal=Astronomy and Astrophysics |date=1 January 2012 |volume=537 |pages=A120 |doi=10.1051/0004-6361/201117691 |arxiv=1201.2052 |bibcode=2012A&A...537A.120Z |s2cid=55586789 |issn=0004-6361}}</ref>
-<ref name = TIC>{{Cite journal|display-authors=1|last1=Stassun|first1=Keivan G.|last2=Oelkers|first2=Ryan J.|last3=Paegert|first3=Martin|last4=Torres|first4=Guillermo|last5=Pepper|first5=Joshua|last6=De Lee|first6=Nathan|last7=Collins|first7=Kevin|last8=Latham|first8=David W.|last9=Muirhead|first9=Philip S.|last10=Chittidi|first10=Jay|last11=Rojas-Ayala|first11=Bárbara|date=2019-10-01|title=The Revised TESS Input Catalog and Candidate Target List|bibcode=2019AJ....158..138S|journal=The Astronomical Journal|volume=158|issue=4|pages=138|doi=10.3847/1538-3881/ab3467|hdl=1721.1/124721|s2cid=166227927|issn=0004-6256|hdl-access=free}}</ref>
+<ref name = Stassun2019>{{cite journal |display-authors=1 |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Paegert |first3=Martin |last4=Torres |first4=Guillermo |last5=Pepper |first5=Joshua |last6=Lee |first6=Nathan De |last7=Collins |first7=Kevin |last8=Latham |first8=David W. |last9=Muirhead |first9=Philip S. |last10=Chittidi |first10=Jay |last11=Rojas-Ayala |first11=Bárbara |last12=Fleming |first12=Scott W. |last13=Rose |first13=Mark E. |last14=Tenenbaum |first14=Peter |last15=Ting |first15=Eric B. |last16=Kane |first16=Stephen R. |last17=Barclay |first17=Thomas |last18=Bean |first18=Jacob L. |last19=Brassuer |first19=C. E. |last20=Charbonneau |first20=David |last21=Ge |first21=Jian |last22=Lissauer |first22=Jack J. |last23=Mann |first23=Andrew W. |last24=McLean |first24=Brian |last25=Mullally |first25=Susan |last26=Narita |first26=Norio |last27=Plavchan |first27=Peter |last28=Ricker |first28=George R. |last29=Sasselov |first29=Dimitar |last30=Seager |first30=S. |last31=Sharma |first31=Sanjib |last32=Shiao |first32=Bernie |last33=Sozzetti |first33=Alessandro |last34=Stello |first34=Dennis |last35=Vanderspek |first35=Roland |last36=Wallace |first36=Geoff |last37=Winn |first37=Joshua N. |title=The Revised TESS Input Catalog and Candidate Target List |journal=The Astronomical Journal |date=9 September 2019 |volume=158 |issue=4 |pages=138 |doi=10.3847/1538-3881/ab3467 |issn=0004-6256 |bibcode=2019AJ....158..138S |arxiv=1905.10694 |doi-access=free}}</ref>
+<ref name = Gontcharov2012>{{cite journal |last1=Gontcharov |first1=G. A. |title=Dependence of kinematics on the age of stars in the solar neighborhood |journal=Astronomy Letters |date=December 2012 |volume=38 |issue=12 |pages=771–782 |doi=10.1134/S1063773712120031 |issn=0320-0108 |bibcode=2012AstL...38..771G |arxiv=1606.08814}}</ref>
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 }}

Observation data Epoch J2000 Equinox J2000
Location of η Octantis (circled)
Constellation	Octans
Right ascension	10^h 59^m 13.7578^s^[1]
Declination	−84° 35′ 38.0177″^[1]
Apparent magnitude (V)	6.18±0.01^[2]
Characteristics
Evolutionary stage	main sequence^[3]
Spectral type	A1 Va^[4]
U−B color index	+0.12^[5]
B−V color index	+0.11^[5]
Astrometry

Radial velocity (R_v)	−1.7±0.6^[6] km/s
Proper motion (μ)	RA: −65.747 mas/yr^[1] Dec.: −8.273 mas/yr^[1]
Parallax (π)	9.1133 ± 0.02 mas^[1]
Distance	357.9 ± 0.8 ly (109.7 ± 0.2 pc)
Absolute magnitude (M_V)	+1.08^[7]

Details

Mass	2.37±0.03^[3] `M`_☉
Radius	2.6±0.1^[8] `R`_☉
Luminosity	45.3+3.1 −3.0^[3] `L`_☉
Surface gravity (log g)	4.1^[9] cgs
Temperature	9,500^[9] K
Metallicity [Fe/H]	−0.01^[10] dex
Rotational velocity (v sin i)	152±13^[11] km/s
Age	547^[10] Myr

Other designations
η Oct, 11 G. Octantis [12], CPD−83°386, FK5 1664, GC 15164, HD 96124, HIP 53702, HR 4312, SAO 258600^[13]
Database references
SIMBAD	data