- References
| name = η Columbae
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Columba
| ra = {{RA|05|59|08.80519}}
| dec = {{DEC|−42|48|54.4822}}
| appmag_v = 3.96[3]
}}{{Starbox character
| class = G8/K1 II[4] or K0 III[5]
| b-v = +1.14[3]
| u-b = +1.08[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = +17.0[5]
| prop_mo_ra = +18.39
| prop_mo_dec = −10.87
| parallax = 6.91
| p_error = 0.12
| parallax_footnote =
| absmag_v = −2.10[12]
}}{{Starbox detail
| source = [5]
| mass = 3.33
| radius = 38.6[14]
| luminosity = 708
| temperature = {{Val|4620|54|fmt=commas}}
| gravity = 1.72
| metal_fe = −0.01
| rotational_velocity =
| age_myr =
}}{{Starbox catalog
| names = η Col, CD−42° 2266, FK5 229, HD 40808, HIP 28328, HR 2120, SAO 217650.[15]
}}{{Starbox reference
| Simbad = eta+Col
}}{{starbox end}}
Eta Columbae is a solitary[16] star near the southern boundary of the constellation Columba.[17] It is visible to the naked eye, having an apparent visual magnitude of 3.96.[3] Based upon an annual parallax shift of 6.91 mas, it lies at a distance of roughly 472 light years from the Sun.
This is an orange-hued[17] K-type giant star with a stellar classification of K0 III,[5] or possibly a bright giant with a crossover class of G8/K1 II.[4] The measured angular diameter of this star, after correction for limb darkening, is {{val|2.48|0.03|u=mas}}.[23] At the estimated distance of this star, this yields a physical size of about 38.6 times the radius of the Sun.[14] It has an estimated 3.33 times the mass of the Sun and radiates 708 times the solar luminosity from its outer atmosphere at an effective temperature of 4,620 K.[5]
References
1. ^1 {{citation | title=Ultraviolet Emission Lines in BA and Non-BA Giants | display-authors=1 | last1=Böhm-Vitense | first1=Erika | last2=Carpenter | first2=Kenneth G. | last3=Robinson | first3=Richard D. | journal=The Astrophysical Journal | postscript=. | volume=545 | issue=2 | pages=992–999 | date=December 2000 | doi=10.1086/317850 | bibcode=2000ApJ...545..992B }}
2. ^1 2 {{citation | title=Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore | series=The Patrick Moore Practical Astronomy Series | first1=Bojan | last1=Kambic |postscript=. | publisher=Springer Science & Business Media | year=2009 | isbn=0387853553 | page=260 | url=https://books.google.com/books?id=3vxLNPNHOcwC&pg=PA260 }}
3. ^1 {{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
4. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | year=2006 | title=Astrophysical formulae | volume=1 | postscript=. | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}} The radius (R*) is given by::
5. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
6. ^1 2 3 4 5 {{cite journal | last1=Luck | first1=R. Earle | title=Abundances in the Local Region. I. G and K Giants | journal=The Astronomical Journal | volume=150 | issue=3 | pages=88 | year=2015 | doi=10.1088/0004-6256/150/3/88 | bibcode=2015AJ....150...88L |arxiv = 1507.01466}}
7. ^1 2 {{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | last1=Houk | first1=Nancy | year=1978 | publisher=Department of Astronomy, University of Michigan | publication-place=Ann Arbor, Michigan | bibcode=1978mcts.book.....H | postscript=. }}
8. ^1 2 3 4 {{citation | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | display-authors=1 | bibcode=1966CoLPL...4...99J | postscript=. }}
9. ^1 {{citation | title=eta Col -- Star | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=eta+Col | accessdate=2016-12-23 | postscript=. }}
[1][2][3][4][5][6][7][8][9]2. ^1 2 {{citation | title=Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore | series=The Patrick Moore Practical Astronomy Series | first1=Bojan | last1=Kambic |postscript=. | publisher=Springer Science & Business Media | year=2009 | isbn=0387853553 | page=260 | url=https://books.google.com/books?id=3vxLNPNHOcwC&pg=PA260 }}
3. ^1 {{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
4. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | year=2006 | title=Astrophysical formulae | volume=1 | postscript=. | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}} The radius (R*) is given by::
5. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
6. ^1 2 3 4 5 {{cite journal | last1=Luck | first1=R. Earle | title=Abundances in the Local Region. I. G and K Giants | journal=The Astronomical Journal | volume=150 | issue=3 | pages=88 | year=2015 | doi=10.1088/0004-6256/150/3/88 | bibcode=2015AJ....150...88L |arxiv = 1507.01466}}
7. ^1 2 {{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | last1=Houk | first1=Nancy | year=1978 | publisher=Department of Astronomy, University of Michigan | publication-place=Ann Arbor, Michigan | bibcode=1978mcts.book.....H | postscript=. }}
8. ^1 2 3 4 {{citation | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | display-authors=1 | bibcode=1966CoLPL...4...99J | postscript=. }}
9. ^1 {{citation | title=eta Col -- Star | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=eta+Col | accessdate=2016-12-23 | postscript=. }}
}}{{Stars of Columba|state=collapsed}}
7 : K-type giants|Columba (constellation)|Bayer objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects