HD 1690#Planetary system

{{short description|Star in the constellation of Cetus}}

{{Starbox begin

| name = HD 1690

}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Cetus

| ra = {{RA|00|21|13.327}}{{Cite Gaia DR3|2430036837596487424}}

| dec = {{DEC|−08|16|52.16}}

| appmag_v = 9.19{{cite journal | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | arxiv=1108.4971 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}

| appmag_b = 10.544

| appmag_g =

| appmag_j = 6.877{{±|0.026}}

}}

{{Starbox character

| type = Giant

| class = K1 III{{cite journal | title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I | journal=The Astronomical Journal | volume=126 | issue=4 | pages=2048–2059 | display-authors=1 | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Robinson | first5=P. E. | year=2003 | bibcode=2003AJ....126.2048G | arxiv=astro-ph/0308182 | doi=10.1086/378365 | s2cid=119417105 }}

| u-b =

| b-v = 1.354{{±|0.045}}

| v-r =

| r-i =

}}

{{Starbox astrometry

| radial_v = +18.216{{±|0.011}}{{cite journal | title=Gaia Data Release 2. The catalogue of radial velocity standard stars | last1=Soubiran | first1=C. | last2=Jasniewicz | first2=G. | last3=Chemin | first3=L. | last4=Zurbach | first4=C. | last5=Brouillet | first5=N. | last6=Panuzzo | first6=P. | last7=Sartoretti | first7=P. | last8=Katz | first8=D. | last9=Le Campion | first9=J. -F. | last10=Marchal | first10=O. | last11=Hestroffer | first11=D. | last12=Thévenin | first12=F. | last13=Crifo | first13=F. | last14=Udry | first14=S. | last15=Cropper | first15=M. | last16=Seabroke | first16=G. | last17=Viala | first17=Y. | last18=Benson | first18=K. | last19=Blomme | first19=R. | last20=Jean-Antoine | first20=A. | last21=Huckle | first21=H. | last22=Smith | first22=M. | last23=Baker | first23=S. G. | last24=Damerdji | first24=Y. | last25=Dolding | first25=C. | last26=Frémat | first26=Y. | last27=Gosset | first27=E. | last28=Guerrier | first28=A. | last29=Guy | first29=L. P. | last30=Haigron | first30=R. | display-authors=1 | journal=Astronomy and Astrophysics | volume=616 | pages=A7 | year=2018 | bibcode=2018A&A...616A...7S | arxiv=1804.09370 | doi=10.1051/0004-6361/201832795 | s2cid=52952408 }}

| prop_mo_ra = 13.285

| prop_mo_dec = 2.919

| pm_footnote =

| parallax = 1.2679

| p_error = 0.0273

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = 1.18{{±|0.23}}{{cite journal |title=New and updated stellar parameters for 71 evolved planet hosts. On the metallicity - giant planet connection |journal=Astronomy and Astrophysics |last1=Mortier |first1=A. |last2=Santos |first2=N. C. |last3=Sousa |first3=S. G. |last4=Adibekyan |first4=V. Zh. |last5=Delgado Mena |first5=E. |last6=Tsantaki |first6=M/ |last7=Israelian |first7=G. |last8=Mayor |first8=M. |date=2013 |volume=557 |number=A70 |pages=A70 |doi=10.1051/0004-6361/201321641 |arxiv=1307.7870 |bibcode=2013A&A...557A..70M |s2cid=55027519 }}

| radius = 16.7{{cite journal |title=Quantization of Planetary Systems and its Dependency on Stellar Rotation |last=Zoghbi |first=J. A. |date=2011 |journal=Publications of the Astronomical Society of Australia |volume=28 |issue=3 |pages=177–201 |doi=10.1071/AS09062 |arxiv=1103.1199|bibcode=2011PASA...28..177Z |s2cid=118417966 }}

| gravity = 2.12{{±|0.17}}

| luminosity_bolometric =

| luminosity_visual =

| temperature = 4,393{{±|85}}

| metal_fe = −0.32{{±|0.06}}

| rotation =

| rotational_velocity = 1.86{{±|0.07}}

| age_gyr = 6.7{{±|3.2}}

}}

{{Starbox catalog

| names = {{odlist | BD=−09 54 | HD=1690 | HIP=1692 | TYC=5262-825-1 | 2MASS=J00211332-0816521 | Gaia DR2=2430036837596487424 }}{{SIMBAD link|HD+1690|HD 1690}}, entry, SIMBAD. Accessed online June 22, 2020.

}}

{{Starbox reference

| Simbad = HD+1690

| NSTED = HD+1690

| ARICNS =

| EPE = HD+1690

}}

{{starbox end}}

HD 1690 is a giant star with an orbiting exoplanet companion in the constellation of Cetus. It has an apparent visual magnitude of 9.19, which is too faint to be visible to the naked eye. The distance to this system is approximately 2,570 light years, and it is drifting further away with a radial velocity of +18.2 km/s. HD 1690 has no known companion star, making it a single star system.

This is an evolved K-type giant star with a stellar classification of K1 III. It has 1.18 times the mass of the Sun and, at the estimated age of 6.7 billion years (two billion years older than the Sun), it has expanded to 16 times the Sun's radius. The surface metallicity of HD 1690 (the abundance of elements more massive than helium) is 30% that of the sun. The Hipparcos parallax data have resulted in a distance determination of just {{val|1012|fmt=commas|ul=light years}},{{cite journal

| last1=van Leeuwen | first1=F.

| title=Validation of the new Hipparcos reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | year=2007

| arxiv=0708.1752

| bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357

| s2cid=18759600

}} but more recent data from Gaia data have placed HD 1690 much farther from the Sun at {{val|2500|fmt=commas|u=light years}}.[http://cdn.gea.esac.esa.int/Gaia/gdr2/gaia_source/csv/ GaiaSource-2429846549069734784-2430330987021111936.csv line 6978]