Xi2 Ceti

{{Short description|Star in the constellation Cetus}}

{{DISPLAYTITLE:Xi2 Ceti}}

{{other stars by Bayer designation|Xi Ceti{{!}}ξ Ceti}}

{{Starbox begin

| name = Xi2 Ceti

}}

{{Starbox observe

| epoch = J2000.0

| constell = Cetus

| ra = {{RA|02|28|09.55706}}

| dec = {{DEC|+08|27|36.2168}}

| appmag_v = +4.279

}}

{{Starbox character

| type =

| class = B9.5III or A0III-

| b-v = {{val|−0.053|0.003}}

| u-b = −0.137

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|11.90|1.3}}

| prop_mo_ra = {{val|23.707|0.844}}

| prop_mo_dec = {{val|-4.787|0.778}}

| parallax = 16.5681

| p_error = 0.4608

| parallax_footnote =

| absmag_v = +0.45

}}

{{Starbox detail

| mass = 2.45

| radius = {{val|2.60|0.17}}

| gravity = {{val|4.00|0.25}}

| luminosity = 80.13

| temperature = {{val|10630|400|fmt=commas}}

| metal_fe = {{val|−0.43|0.04}}

| rotational_velocity = 55

| age_myr = 127

}}

{{Starbox catalog

| names = {{odlist | B=ξ2 Cet | F=73 Ceti | HD=15318 | HR=718 | HIP=11484 | BD=+07°388 | SAO=110543 }}

}}

{{Starbox reference

| Simbad = 73+Cet

}}

{{Starbox end}}

Xi2 Ceti, Latinized from ξ2 Ceti, is a star located in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of +4.3. This star is located at a distance of approximately 197 light years from the Sun based on parallax, and is drifting further away with a radial velocity of 12 km/s. It made its closest approach some 2.7 million years ago at a distance of around {{convert|39.25|pc|ly|0|abbr=off|disp=out}}.

Xi2 Ceti is a spectrophotometric standard star. It displays a stellar classification of B9.5III, which suggests it has exhausted its core hydrogen, evolved away from the main sequence, and expanded to become a giant star, although still only 127 million years old. It has 2.45 times the mass and 2.6 times the radius of the Sun.

In Chinese, {{lang|zh|天囷}} ({{lang|zh-Latn|Tiān Qūn}}), meaning Circular Celestial Granary, refers to an asterism consisting of α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, γ Ceti, δ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, the Chinese name for Xi2 Ceti itself is "the Sixth Star of Circular Celestial Granary", {{lang|zh-Latn|Tiān Qūn Liù}}.{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060711.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日] {{Webarchive|url=https://web.archive.org/web/20120204114123/http://aeea.nmns.edu.tw/2006/0607/ap060711.html |date=2012-02-04 }}

References

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{{cite DR2|22745910577134848}}

{{cite journal|bibcode=1987ApJS...65..581G|title=The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation|journal=The Astrophysical Journal Supplement Series|volume=65|pages=581|last1=Gray|first1=R. O.|last2=Garrison|first2=R. F.|year=1987|doi=10.1086/191237|doi-access=free}}

{{cite journal|bibcode=2015ApJ...804..146D|title=The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets|journal=The Astrophysical Journal|volume=804|issue=2|pages=146|last1=David|first1=Trevor J.|last2=Hillenbrand|first2=Lynne A.|year=2015|doi=10.1088/0004-637X/804/2/146|arxiv=1501.03154|s2cid=33401607}}

}}