chi1 Orionis

{{other stars by Bayer designation|Chi Orionis{{!}}χ Orionis}}

{{Starbox begin

| name = Chi¹ Orionis A

}}

{{Starbox image

| image = 150px

| caption = Star map of the Bayers Stars in Orion. Chi¹ Orionis is indicated.

}}

{{Starbox observe

| epoch = J2000

| constell = Orion

| ra = {{RA|05|54|22.96136}}

| dec = {{DEC|+20|16|34.5194}}

| appmag_v = 4.38 - 4.41

}}

{{Starbox character

| class = G0 V

| b-v = +0.59

| u-b = +0.07

| variable = RS CVn

}}

{{Starbox astrometry

| radial_v = −15.42

| prop_mo_ra = {{val|-179.014}}

| prop_mo_dec = {{val|-90.73}}

| pm_footnote =

| parallax = 114.9497

| p_error = 0.528

| parallax_footnote =

| absmag_v = {{Val|4.82|0.005}}

}}

{{Starbox orbit

| reference = {{cite journal | title=A Precise Orbit Determination of χ¹Orionis from Astrometric and Radial Velocity Data | last1=Han | first1=Inwoo | last2=Gatewood | first2=George | journal=Publications of the Astronomical Society of the Pacific | volume=114 | issue=792 | pages=224–228 | year=2002 | bibcode=2002PASP..114..224H | doi=10.1086/338367 | s2cid=122100081 | doi-access=free}}

| period_unitless = {{val|5156.291|2.508|u=days}}

| axis_unitless = {{val|89.662|0.880}} mas

| eccentricity = {{val|0.452|0.002}}

| inclination = {{val|95.937|0.790}}

| node = {{val|126.360|0.593}}

| periastron = {{val|2451468.2|3.083}} JD

| periarg = {{val|111.527|0.230}}

| k1 = {{val|1.876|0.003}}

}}

{{Starbox detail

| component1 = primary

| mass = 1.01

| radius = {{val|0.983|0.01}}

| luminosity = {{val|1.042|0.042}}

| temperature = {{val|fmt=commas|5883|63}}

| metal_fe = {{val|-0.03|0.01}}

| gravity = {{val|4.47|0.02}}

| rotation = 5.2 days

| rotational_velocity = 8.7

| age_myr = 300–400

| component2 = companion

| mass2 = 0.15

| age_myr2 = 70-130

}}

{{Starbox catalog

| names=54 Ori, Gl 222, HR 2047, BD+20°1162, HD 39587, LTT 11743, GCTP 1354.00, SAO 77705, HIP 27913

}}

{{Starbox reference

|Simbad = chi01+Ori

}}

Chi¹ Orionis (χ¹ Ori, χ¹ Orionis) is a star about 28 light years away. It is in the constellation Orion, where it can be seen in the tip of the hunter's upraised club.

File:Chi1OriLightCurve.png for Chi¹ Orionis, plotted from TESS data. The 5.5 day period derived by Stępień and Geyer is marked in red.]]

χ¹ Ori is a G0V star. It is listed in the General Catalog of Variable Stars as an RS Canum Venaticorum variable, varying between visual magnitude 4.38 and 4.41. Stępień and Geyer measured its period to be 5.5 days.

χ¹ Ori has a faint companion with a mass estimated at 15% of the mass of the Sun, and an orbital period of 14.1 years. The companion orbits an average distance of 6.1 AU from the primary, but has a fairly high orbital eccentricity, ranging from 3.3 AU out to 8.9 AU from the primary. Because of this red dwarf companion, the likelihood of habitable planets in this system is low. It is thought that the companion is a red dwarf still contracting towards the main sequence.

A necessary condition for the existence of a planet in this system are stable zones where the object can remain in orbit for long intervals. For hypothetical planets in a circular orbit around the individual members of this star system, this maximum orbital radius is computed to be 1.01 AU for the primary and 0.41 AU for the secondary. (Note that the orbit of the Earth is 1 AU from the Sun.) A planet orbiting outside of both stars would need to be at least 18.4 AU distant.

χ¹ Ori is a candidate stream star member of the Ursa Major Moving Group, although there is some evidence to the contrary.

References

{{reflist|refs=

{{cite journal|bibcode=1991bsc..book.....H|title=The Bright star catalogue|journal=New Haven, Conn.: Yale University Observatory, 5th Rev.ed.|year=1991|last1=Hoffleit|first1=Dorrit|last2=Jaschek|first2=Carlos}}

{{cite web | title=khi 1 Ori | url=http://www.sai.msu.su/gcvs/cgi-bin/search2.cgi?search=khi+1+Ori | website=General Catalog of Variable Stars | publisher=Sternberg Astronomical Institute | access-date=29 December 2022}}

{{Cite journal |last1=Soubiran |first1=C. |last2=Creevey |first2=O. L. |last3=Lagarde |first3=N. |last4=Brouillet |first4=N. |last5=Jofré |first5=P. |last6=Casamiquela |first6=L. |last7=Heiter |first7=U. |last8=Aguilera-Gómez |first8=C. |last9=Vitali |first9=S. |last10=Worley |first10=C. |last11=de Brito Silva |first11=D. |date=2024-02-01 |title=Gaia FGK benchmark stars: Fundamental Teff and log g of the third version |bibcode=2024A&A...682A.145S |journal=Astronomy and Astrophysics |volume=682 |pages=A145 |doi=10.1051/0004-6361/202347136 |arxiv=2310.11302 |issn=0004-6361}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/682/A145&recno=64 Chi1 Orionis' database entry] at VizieR.

{{cite web | title=MAST: Barbara A. Mikulski Archive for Space Telescopes | url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html | publisher=Space Telescope Science Institute | access-date=28 December 2022}}

{{cite journal | title=The Perkins catalog of revised MK types for the cooler stars | last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | journal=The Astrophysical Journal Supplement Series | volume=71 | pages=245 | year=1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 | s2cid=123149047}}

{{cite journal | last1=Stępień |first1=K. | last2=Geyer | first2=E. | bibcode=1996A&AS..117...83S | title=Rotation of solar-like main sequence stars | journal=Astronomy and Astrophysics Supplement |date=May 1996 |volume=117 |pages=83–91 |doi=10.1051/aas:1996141 |doi-access=free}}

{{cite journal | display-authors=1 | last1=Park | first1=Sunkyung | last2=Kang | first2=Wonseok | last3=Lee | first3=Jeong-Eun | last4=Lee | first4=Sang-Gak | title=Wilson-Bappu Effect: Extended to Surface Gravity | journal=The Astronomical Journal | volume=146 | issue=4 | pages=73 | year=2013 | doi=10.1088/0004-6256/146/4/73 | bibcode=2013AJ....146...73P | arxiv=1307.0592 | s2cid=119187733}}

{{cite journal | display-authors=1 | last1=Maldonado | first1=J. | last2=Martínez-Arnáiz | first2=R. M. | last3=Eiroa | first3=C. | last4=Montes | first4=D. | last5=Montesinos | first5=B. | title=A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups | journal=Astronomy and Astrophysics | volume=521 | page=A12 |date=October 2010 | doi=10.1051/0004-6361/201014948 | bibcode=2010A&A...521A..12M |arxiv = 1007.1132 | s2cid=119209183}}

{{cite journal | last1=Mamajek | first1=Eric E. | last2=Hillenbrand | first2=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 |date=November 2008 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 | s2cid=27151456}}

{{cite journal | display-authors=1 | last1=Jaime | first1=Luisa G. | last2=Pichardo | first2=Barbara | last3=Aguilar | first3=Luis | title=Regions of dynamical stability for discs and planets in binary stars of the solar neighbourhood | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=4 | pages=2723–2733 | date=December 2012 | bibcode=2012MNRAS.427.2723J | doi=10.1111/j.1365-2966.2012.21839.x | doi-access=free | arxiv=1208.2051 | s2cid=118570249}}

{{cite journal |bibcode=2002A&A...394L..43K |title=Direct detection of the companion of chi ¹ Orionis |last1=König |first1=B. |last2=Fuhrmann |first2=K. |last3=Neuhäuser |first3=R. |last4=Charbonneau |first4=D. |last5=Jayawardhana |first5=R. |journal=Astronomy and Astrophysics |year=2002 |volume=394 |doi=10.1051/0004-6361:20021377 |arxiv=astro-ph/0209404 |s2cid=10411048}}

{{cite web |author=Jim Kaler |url=http://stars.astro.illinois.edu/sow/chi1ori.html |title=Chi-1 Orionis |access-date=2022-12-29}}

}}

External links

[http://stars.astro.illinois.edu/sow/chi1ori.html Chi-1 Orionis] by Professor Jim Kaler.
[http://www.solstation.com/stars/chi1ori2.htm Chi1 Orionis 2] at SolStation.

Category:G-type main-sequence stars

Category:M-type main-sequence stars

Orionis, 54

Category:Binary stars

Category:Ursa Major moving group

Category:Orion (constellation)

chi1 Orionis

See also

References

External links