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HD 159868

{{Starbox begin}}

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

{{Starbox observe

| epoch = J2000

| constell = Scorpius

| ra = {{RA|17|38|59.5269}}

| dec = {{DEC|−43|08|43.842}}

| appmag_v = +7.24

}}

{{Starbox character

| type =

| class = G5V

| appmag_1_passband = J

| appmag_1 = {{val|5.941|0.021}}

| appmag_2_passband = H

| appmag_2 = {{val|5.567|0.026}}

| appmag_3_passband = K

| appmag_3 = {{val|5.535|0.024}}

| b-v = {{val|0.714|0.012}}

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|−23.80|0.76}}

| prop_mo_ra = {{val|−230.824}}

| prop_mo_dec = {{val|−167.903}}

| parallax = 17.8754

| p_error = 0.0207

| parallax_footnote =

| absmag_v = +3.63

}}

{{Starbox detail

| source =

| mass = {{val|1.123|0.018}}

| radius = {{val|1.97|0.04|u=solar radius}}

| luminosity = 3.82

| gravity = {{val|3.96|0.02}}

| temperature = {{val|5558|15|fmt=commas}}

| metal_fe = {{val|−0.08|0.01}}

| rotation = 7.26 days

| rotational_velocity = 2.1

| age_gyr = {{val|6.6|0.2}}

}}

{{Starbox catalog

| names = {{odlist | HD=159868 | CD=−43°11901 | GJ=4014 | HIP=86375 | SAO=228234 }}

}}

{{Starbox reference

| Simbad = HD+159868

}}

{{Starbox end}}

HD 159868 is a star in the southern constellation of Scorpius, positioned about 0.3° to the ESE of the bright star Theta Scorpii. With an apparent visual magnitude of +7.24, it is too faint to be visible to the naked eye but can be viewed with a small telescope. The star lies at a distance of 182 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −24 km/s.

Properties

The spectrum of HD 159868 matches a G-type main-sequence star with a stellar classification of G5V. It has a relatively low surface gravity for its class, which suggests it is slightly evolved off the main sequence. The star is chromospherically inactive with a slow rotation rate, having a projected rotational velocity of 2.1 km/s. It is an estimated 6.6 billion years old with 8–12% more mass than the Sun and nearly double the Sun's radius. The star is radiating 3.8 times the luminosity of the Sun from its photosphere at an effective temperature of 5,558 K.

Planetary system

In 2007, a planet of the star was announced by astronomer Simon J. O'Toole and collaborators. The planet (designated HD 159868 b) is likely to be a gas giant. Preliminary orbital elements suggested the orbit is extremely eccentric at the average distance of 2 astronomical units (AU), ranging as close as 0.62 AU to as far as 3.38 AU. In 2012, a second planet of the star was announced by astronomer Robert A. Wittenmyer and associates. The orbit of the first planet was significantly revised during the investigation.

{{OrbitboxPlanet begin

| table_ref = }}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|0.73|0.05|p=≥}}

| semimajor = {{val|1.00|0.01}}

| period = {{val|352.3|1.3}}

| eccentricity = {{val|0.15|0.05}}

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|2.1|0.1|p=≥}}

| semimajor = {{val|2.25|0.03}}

| period = {{val|1178.4|8.8|fmt=commas}}

| eccentricity = {{val|0.01|0.03}}

}}

{{Orbitbox end}}

See also

References

{{Reflist|refs=

{{cite simbad | title=HD 159868 | access-date=2019-09-10 }}

{{cite Gaia DR3|5955841736510622208}}

{{cite journal |bibcode=2018AJ....155...39O |title=Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey |last1=Oelkers |first1=Ryan J. |last2=Rodriguez |first2=Joseph E. |last3=Stassun |first3=Keivan G. |last4=Pepper |first4=Joshua |last5=Somers |first5=Garrett |last6=Kafka |first6=Stella |last7=Stevens |first7=Daniel J. |last8=Beatty |first8=Thomas G. |last9=Siverd |first9=Robert J. |last10=Lund |first10=Michael B. |last11=Kuhn |first11=Rudolf B. |last12=James |first12=David |last13=Gaudi |first13=B. Scott |journal=The Astronomical Journal |date=2018 |volume=155 |issue=1 |page=39 |doi=10.3847/1538-3881/aa9bf4 |doi-access=free |arxiv=1711.03608 }}

{{cite journal |bibcode=2023AJ....165...34H |title=A Catalog of Habitable Zone Exoplanets |last1=Hill |first1=Michelle L. |last2=Bott |first2=Kimberly |last3=Dalba |first3=Paul A. |last4=Fetherolf |first4=Tara |last5=Kane |first5=Stephen R. |last6=Kopparapu |first6=Ravi |last7=Li |first7=Zhexing |last8=Ostberg |first8=Colby |journal=The Astronomical Journal |date=2023 |volume=165 |issue=2 |page=34 |doi=10.3847/1538-3881/aca1c0 |doi-access=free |arxiv=2210.02484 }}

{{cite book

| last1=Houk | first1=N.

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=2 | date=1978

| publisher=Dept. of Astronomy, University of Michigan

| bibcode=1978mcts.book.....H }}

{{cite book

| first1=Roger W. | last1=Sinnott

| first2=Michael A. C. | last2=Perryman

| title=Millennium Star Atlas | page=1460

| volume=3 | year=1997 | isbn=0-933346-84-0

| publisher=Sky Publishing Corporation and the European Space Agency }}

{{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 }}

{{cite journal

| title=Abundance to age ratios in the HARPS-GTO sample with Gaia DR2. Chemical clocks for a range of [Fe/H]

| display-authors=1 | last1=Delgado Mena | first1=E.

| last2=Moya | first2=A. | last3=Adibekyan | first3=V.

| last4=Tsantaki | first4=M. | last5=González Hernández | first5=J. I.

| last6=Israelian | first6=G. | last7=Davies | first7=G. R.

| last8=Chaplin | first8=W. J. | last9=Sousa | first9=S. G.

| last10=Ferreira | first10=A. C. S. | last11=Santos | first11=N. C.

| journal=Astronomy & Astrophysics

| volume=624 | id=A78 | pages=24 | date=April 2019

| arxiv=1902.02127 | bibcode=2019A&A...624A..78D

| doi=10.1051/0004-6361/201834783 | s2cid=90259810 }}

{{cite journal

| title=The Anglo-Australian Planet Search. XXII. Two New Multi-planet Systems

| last1=Wittenmyer | first1=Robert A. | last2=Horner | first2=J.

| last3=Tuomi | first3=Mikko | last4=Salter | first4=G. S.

| last5=Tinney | first5=C. G. | last6=Butler | first6=R. P.

| last7=Jones | first7=H. R. A.| last8=O'Toole | first8=S. J.

| last9=Bailey | first9=J. | last10=Carter | first10=B. D.

| last11=Jenkins | first11=J. S. |last12=Zhang | first12=Z.

| last13=Vogt | first13=S. S. |last14=Rivera | first14=Eugenio J.

| display-authors=1 | journal=The Astrophysical Journal

| volume=753 | issue=2 | date=2012 | pages= 169

| bibcode=2012ApJ...753..169W | arxiv=1205.2765

| doi=10.1088/0004-637X/753/2/169 | s2cid=2941264 }}

{{cite journal

| title=New Planets around Three G Dwarfs

| last1=O'Toole | first1=Simon J. | last2=Butler | first2=R. Paul

| last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A.

| last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad

| last7=McCarthy | first7=Chris | last8=Bailey | first8=Jeremy

| last9=Penny | first9=Alan J. | display-authors=1

| journal=The Astrophysical Journal

| volume=660 | issue=2 | pages=1636–1641 | year=2007

| arxiv=astro-ph/0702213 | doi=10.1086/513563 | doi-access=free

| bibcode=2007ApJ...660.1636O | bibcode-access=free }}

{{cite journal

| title=Identification of a Constellation From a Position

| last1=Roman | first1=Nancy G.

| journal=Publications of the Astronomical Society of the Pacific

| volume=99 | issue=617 | pages=695–699 | year=1987

| bibcode=1987PASP...99..695R | bibcode-access=free

| doi=10.1086/132034 | doi-access=free

}} [http://vizier.u-strasbg.fr/vizier/VizieR/constellations.htx Vizier query form ]

{{cite journal |doi=10.1086/498708 |last1=Skrutskie |first1=Michael F. |last2=Cutri |first2=Roc M. |last3=Stiening |first3=Rae |last4=Weinberg |first4=Martin D. |last5=Schneider |first5=Stephen E. |last6=Carpenter |first6=John M. |last7=Beichman |first7=Charles A. |last8=Capps |first8=Richard W. |last9=Chester |first9=Thomas |last10=Elias |first10=Jonathan H. |last11=Huchra |first11=John P. |last12=Liebert |first12=James W. |last13=Lonsdale |first13=Carol J. |last14=Monet |first14=David G. |last15=Price |first15=Stephan |last16=Seitzer |first16=Patrick |last17=Jarrett |first17=Thomas H. |last18=Kirkpatrick |first18=J. Davy |last19=Gizis |first19=John E. |last20=Howard |first20=Elizabeth V. |last21=Evans |first21=Tracey E. |last22=Fowler |first22=John W. |last23=Fullmer |first23=Linda |last24=Hurt |first24=Robert L. |last25=Light |first25=Robert M. |last26=Kopan |first26=Eugene L. |last27=Marsh |first27=Kenneth A. |last28=McCallon |first28=Howard L. |last29=Tam |first29=Robert |last30=Van Dyk |first30=Schuyler D. |last31=Wheelock |first31=Sherry L. |title=The Two Micron All Sky Survey (2MASS) |journal=The Astronomical Journal |date=1 February 2006 |volume=131 |issue=2 |pages=1163–1183 |bibcode=2006AJ....131.1163S |s2cid=18913331 |issn=0004-6256 |doi-access=free }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=II/246/out&2MASS===17385955-4308437 Vizier catalog entry ]

}}

External links

  • {{cite web |url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+159868 |title=HD 159868 |access-date=2008-07-19 |work=Exoplanets |archive-url=https://web.archive.org/web/20080514234134/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+159868 |archive-date=2008-05-14 |url-status=dead }}
  • {{cite encyclopedia |url=http://exoplanet.eu/star.php?st=HD+159868 |archive-url=https://web.archive.org/web/20070702185654/http://exoplanet.eu/star.php?st=HD+159868 |url-status=dead |archive-date=July 2, 2007 |encyclopedia=Extrasolar Planets Encyclopaedia |title=Notes for star HD 159868 |access-date=2008-07-19 }}

{{Sky|17|38|59.526|-|43|08|43.84|182.5}}

{{Stars of Scorpius}}

Category:G-type main-sequence stars

Category:Planetary systems with two confirmed planets

Category:Scorpius

Category:Durchmusterung objects

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159868

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