iota Leonis

{{Starbox begin

| name = ι Leonis

}}

{{Starbox image

| image=

{{Location mark

|image=Leo constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=ι Leonis

|x=252|y=648

}}

|caption=Location of ι Leonis (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|11|23|55.45273}}

| dec = {{DEC|+10|31|46.2195}}

| appmag_v = 4.00

| constell = Leo

}}

{{Starbox character

| class = F4 IV + F3 V + K4 V

| b-v = +0.456

| u-b = +1.420

| variable = Suspected

}}

{{Starbox astrometry

| radial_v = −10.3

| prop_mo_ra = +141.45

| prop_mo_dec = −79.14

| parallax = 41.26

| p_error = 1.16

| parallax_footnote =

| absmag_v = +2.13

}}

{{Starbox orbit

| reference =

| primary = ι Leo A

| name = ι Leo B

| period = {{val|189.561|0.631|0.814}}

| axis = {{val|1.926|0.01|0.009}}

| inclination = {{val|127.249|0.287|0.412}}

| node = {{val|56.178|0.434|0.449}}

| periastron = {{val|1948.86|0.193|0.278}}

| eccentricity = {{Val|0.550|0.003}}

| periarg = {{val|145.345|0.561|0.714}}

}}

{{Starbox detail

| component1 = ι Leo A

| mass = {{val|1.417|0.044|0.081}}

| radius = {{Val|2.93|0.10}}

| luminosity = 11.5

| temperature = 6,739

| metal_fe = 0.06

| rotational_velocity = 16

| gravity = 3.98

| age_gyr = {{val|1.7|0.2}}

| component2 = ι Leo B

| mass2 = {{val|1.183|0.163|0.157}}

}}

{{Starbox catalog

| names = {{odlist | B=ι Leo | F=78 Leo | BD=+11°2348 | GJ=426.1 | GJ2=9359 | HD=99028 | HIP=55642 | HR=4399 | SAO=99587}}

}}

{{Starbox reference

| Simbad = *+iot+Leo |sn=A

| Simbad2 = *+iot+Leo+B |sn2=B

}}

Iota Leonis, Latinized from ι Leonis, is a quadruple star system in the constellation Leo. The system is fairly close to the Sun, at only 79 light-years (24.2 parsecs) away, based on its parallax. The system has a combined apparent magnitude of 4.00 making it faintly visible to the naked eye. It is moving closer to the Sun with a radial velocity of −10 km/s.

The primary star, Iota Leonis A, has a spectral type of F3 IV, matching that of an F-type subgiant star. The second component in the star system is designated Iota Leonis B. It orbits the primary every 190 years, and with its perihelion passage in 1948, the separation between the two is steadily growing. The pair is also listed as a single-lined spectroscopic binary. It is a F-type main-sequence star with a mass 18.3% greater than that of the Sun.

The outer companion is designated StKM 2-732{{cite simbad |title=StKM 2-732}} and is also called Iota Leonis C. It has an angular separation from the inner pair by 331" along a position angle of 346°, and is itself a close binary. The combined spectrum is K6V.

Name

In Chinese, {{lang|zh|太微右垣}} ({{lang|zh-Latn|Tài Wēi Yòu Yuán}}), meaning Right Wall of Supreme Palace Enclosure, refers to an asterism consisting of ι Leonis, β Virginis, σ Leonis, θ Leonis and δ Leonis.{{in lang|zh}} 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}. Consequently, the Chinese name for ι Leonis itself is {{lang|zh|太微右垣三}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán sān}}, {{langx|en|the Third Star of Right Wall of Supreme Palace Enclosure}}),{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20100819122914/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm |date=2010-08-19 }}, Hong Kong Space Museum. Accessed on line November 23, 2010. representing {{lang|zh|西次將}} ({{lang|zh-Latn|Xīcìjiāng}}), meaning The Second Western General.{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm#SupremePalaceEnclosure English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name] {{webarchive|url=https://web.archive.org/web/20080924022136/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm |date=2008-09-24 }}, Hong Kong Space Museum. Accessed on line November 23, 2010. 西次將 (Xīcìjiāng), spelled Tsze Tseang by R.H. Allen, means "the Second General".{{cite web |url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Leo*.html |title=LacusCurtius • Allen's Star Names — Leo |author=Richard Hinckley Allen |work=Star Names |date=1963}}

References

{{reflist|refs=

{{cite journal | first1=Floor | last1=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | arxiv=0708.1752v1 | doi=10.1051/0004-6361:20078357 | journal=Astronomy and Astrophysics | s2cid=18759600 }} Note: see VizieR catalogue [http://vizier.u-strasbg.fr/viz-bin/Cat?I/311 I/311].

{{Cite journal |last=Tokovinin |first=Andrei |date=2018-03-01 |title=The Updated Multiple Star Catalog |bibcode=2018ApJS..235....6T |journal=The Astrophysical Journal Supplement Series |volume=235 |issue=1 |pages=6 |doi=10.3847/1538-4365/aaa1a5 |doi-access=free |arxiv=1712.04750 |issn=0067-0049}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/235/6&ID=11239%2B1032 Iota Leonis' database entry] at VizieR.

{{cite journal |last1=Anguita-Aguero |first1=Jennifer |last2=Mendez |first2=Rene A. |last3=Videla |first3=Miguel |last4=Costa |first4=Edgardo |last5=Vanzi |first5=Leonardo |last6=Castro-Morales |first6=Nicolas |last7=Caballero-Valdes |first7=Camila |date=September 2023 |title=Mass Ratio of Single-line Spectroscopic Binaries with Visual Orbits Using Bayesian Inference and Suitable Priors |journal=The Astronomical Journal |language=en |volume=166 |issue=4 |pages=172 |doi=10.3847/1538-3881/acf297 |doi-access=free |issn=1538-3881|arxiv=2309.06394|bibcode=2023AJ....166..172A }}

{{cite journal

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 }}

{{cite web | title=iot Leo -- Spectroscopic binary | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot+Leo | access-date=2010-04-07 }}

{{Cite conference | last=Wilson | first=R. E. | date=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institute | location=Washington D.C. | bibcode=1953GCRV..C......0W }}

{{cite journal | last=Balachandran | first=Suchitra | title=Lithium depletion and rotation in main-sequence stars | journal=Astrophysical Journal, Part 1 | volume=354 | date=May 1, 1990 | pages=310–332 | doi=10.1086/168691 | bibcode=1990ApJ...354..310B

}}

{{cite journal | last=Rufener | first=F. | title=Second catalogue of stars measured in the Geneva Observatory photometric system | journal=Astronomy & Astrophysics Supplement Series | volume=26 | pages=275–351 |date=October 1976 | bibcode=1976A&AS...26..275R }}

{{cite journal | title=Nachrichtenblatt der Vereinigung der Sternfreunde e.V. (Catalogue of suspected variable stars) | location=Moscow, Academy of Sciences USSR Shternberg | author=Kukarkin, B. V. | journal=Nachrichtenblatt der Vereinigung der Sternfreunde |display-authors=etal | date=1981 | bibcode=1981NVS...C......0K }}

{{cite journal |author1=Bi, S.-L. |author2=Basu, Sarbani |author3=Li, L.-H. | title=Seismological Analysis of the Stars γ Serpentis and ι Leonis: Stellar Parameters and Evolution | journal=The Astrophysical Journal | volume=673 | issue=2 | pages=1093–1105 |date=February 2008 | doi=10.1086/521575 | bibcode=2008ApJ...673.1093B | doi-access=free }}

{{cite journal|title=S_B⁹: The ninth catalogue of spectroscopic binary orbits|display-authors=1|author1=Pourbaix, D.|author2=Tokovinin, A. A.|author3=Batten, A. H.|author4=Fekel, F. C.|author5=Hartkopf, W. I.|author6=Levato, H.|author7=Morrell, N. I.|author8=Torres, G.|author9=Udry, S.|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727–732|year=2004|doi=10.1051/0004-6361:20041213|arxiv=astro-ph/0406573|bibcode=2004A&A...424..727P|s2cid=119387088}}

{{cite journal |arxiv=2211.01449 |last1=Golovin |first1=Alex |last2=Reffert |first2=Sabine |last3=Just |first3=Andreas |last4=Jordan |first4=Stefan |last5=Vani |first5=Akash |last6=Jahreiß |first6=Hartmut |title=The Fifth Catalogue of Nearby Stars (CNS5) |date=November 2022 |journal=Astronomy & Astrophysics |volume=670 |issue= |pages=A19 |doi=10.1051/0004-6361/202244250 |bibcode=2023A&A...670A..19G|s2cid=253264922 }} Catalogue can be accessed [https://dc.g-vo.org/CNS5 here].

}}

Category:F-type subgiants

Category:Binary stars

Category:Spectroscopic binaries

Category:Suspected variables

Leonis, Iota

Category:Leo (constellation)

iota Leonis

Name

See also

References