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HD 188015

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

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0

| constell = Vulpecula

| ra = {{RA|19|52|04.5427}}

| dec = {{DEC|+28|06|01.345}}

| appmag_v = 8.24

}}

{{Starbox character

| type =

| class = G5IV

| b-v = {{val|0.727|0.010}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|+0.16|(12)}}

| prop_mo_ra = {{val|52.809|(15)}}

| prop_mo_dec = {{val|−92.166|(17)}}

| pm_footnote =

| parallax = 19.7004

| p_error = 0.0194

| parallax_footnote =

| absmag_v = 4.47

}}

{{Starbox detail

| source =

| mass = {{val|1.08|0.02}}

| radius = {{val|1.21|0.03}}

| gravity = {{val|4.30|0.03}}

| luminosity = {{val|1.41|0.03}}

| temperature = {{val|5726|28|fmt=commas}}

| metal_fe = {{val|0.27|0.02}}

| age_gyr = {{val|5.9|1.3}}

| rotational_velocity = 5.0

}}

{{Starbox catalog

| names = {{odlist | 2MASS=J19520455+2806015 | BD=+27 3539 | HIP=97769}}

}}

{{Starbox reference

| Simbad = HD+188015

}}

{{Starbox end}}

HD 188015 is a yellow-hued star with an exoplanetary companion in the northern constellation of Vulpecula. It has an apparent visual magnitude of 8.24, making it an 8th magnitude star, and thus is too faint to be readily visible to the naked eye. The distance to this star can be estimated through parallax measurements, which yield a separation of 165.6 light years from the Sun.

This star was assigned a stellar classification of G5IV by J. F. Heard in 1956, matching the spectrum of an evolving G-type subgiant star. This suggests it has ceased or is about to stop hydrogen fusion in its core. The absolute magnitude of 4.47 lies just above the main sequence. It is estimated to be six billion years old and is chromospherically quiet with a projected rotational velocity of 5 km/s. The star is almost twice as metal-rich as the Sun. It has 1.1 times the mass and 1.2 times the radius of the Sun. HD 188015 is radiating 1.4 times the luminosity of the Sun from its photosphere at an effective temperature of 5,726 km/s.

Companions

A stellar common proper motion candidate was announced in 2006 and designated HD 188015 B. It is located at an angular separation of {{val|13|ul=arcsecond}} along a position angle of 85°. The photometric distance estimate for this object is {{convert|46.9|±|9.5|pc|ly|order=flip|abbr=on}}, matching the primary within the margin of error. They have a projected separation of {{val|684|ul=AU}}.

A Jovian planetary companion to this star was announced in 2005, based on radial velocity measurements indicating a periodic perturbation. It is orbiting the host star at a distance of {{val|1.2|ul=AU}} with a period of {{convert|461.2|days|years|2|disp=out|abbr=off}} and an eccentricity (ovalness) of 0.14. The inclination of the orbital plane remains unknown, so only a lower bound on the planet's mass can be determined. It has a minimum mass equal to 1.5 times the mass of Jupiter. The orbital path of this object intersects the habitable zone of the star, which is likely to eject any Earth-like planet from that region. Nevertheless, habitable moons are still possible in this system.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = >1.50 ± 0.13

| period = 461.2 ± 1.7

| semimajor = 1.203 ± 0.070

| eccentricity = 0.137 ± 0.026

| year = 2005

}}

{{Orbitbox end}}

See also

References

{{Reflist|refs=

{{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 Gaia DR3|2028419118720795392}}

{{cite journal

| title=Five New Extrasolar Planets

| last1=Marcy | first1=Geoffrey W. | last2=Butler | first2=R. Paul

| last3=Vogt | first3=Steven S. | last4=Fischer | first4=Debra A.

| last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Greg

| last7=Wright | first7=Jason T. | last8=Johnson | first8=John A.

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

| volume=619 | issue=1 | pages=570–584 | year=2005

| bibcode=2005ApJ...619..570M | bibcode-access=free

| citeseerx=10.1.1.516.6667 | doi=10.1086/426384 | doi-access=free }}

{{cite simbad | title=HD 188015 | access-date=2018-10-21 }}

{{cite journal

| title=SWEET-Cat updated. New homogenous spectroscopic parameters

| display-authors=1 | last1=Sousa | first1=S. G.

| last2=Adibekyan | first2=V. | last3=Delgado-Mena | first3=E.

| last4=Santos | first4=N. C. | last5=Andreasen | first5=D. T.

| last6=Ferreira | first6=A. C. S. | last7=Tsantaki | first7=M.

| last8=Barros | first8=S. C. C. | last9=Demangeon | first9=O.

| last10=Israelian | first10=G. | last11=Faria | first11=J. P.

| last12=Figueira | first12=P. | last13=Mortier | first13=A.

| last14=Brandão | first14=I. | last15=Montalto | first15=M.

| last16=Rojas-Ayala | first16=B. | last17=Santerne | first17=A.

| journal=Astronomy & Astrophysics

| volume=620 | id=A58 | pages=13 | date=November 2018

| doi=10.1051/0004-6361/201833350 | arxiv=1810.08108

| bibcode=2018A&A...620A..58S | s2cid=119374557 }}

{{cite journal

| title=Age consistency between exoplanet hosts and field stars

| last1=Bonfanti | first1=A.

| last2=Ortolani | first2=S. | last3=Nascimbeni | first3=V.

| journal=Astronomy & Astrophysics

| year=2016 | volume=585 | id=A5 | pages=14

| arxiv=1511.01744 | bibcode=2016A&A...585A...5B

| doi=10.1051/0004-6361/201527297 | s2cid=53971692 }}

{{cite journal

| title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants

| last=Luck | first=R. Earle

| journal=The Astronomical Journal

| volume=153 | issue=1 | id=21 | pages=19 | date=January 2017

| bibcode=2017AJ....153...21L | arxiv=1611.02897

| doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | doi-access=free }}

{{cite journal

| title=The radial velocities, spectral classes and photographic magnitudes of 1041 late-type stars

| last=Heard | first=John Frederick

| journal=Publications of the David Dunlap Observatory

| publisher=University of Toronto Press

| location=University of Toronto, Toronto, Canada

| volume=2 | issue=4 | pages=107–143 | date=1956

| bibcode=1956PDDO....2..107H }}

{{cite journal

| title=Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems

| display-authors=1 | last1=Raghavan | first1=Deepak

| last2=Henry | first2=Todd J. | last3=Mason | first3=Brian D.

| last4=Subasavage | first4=John P. | last5=Jao | first5=Wei-Chun

| last6=Beaulieu | first6=Thom D. | last7=Hambly | first7=Nigel C.

| journal=The Astrophysical Journal

| volume=646 | issue=1 | pages=523–542 | date=July 2006

| doi=10.1086/504823 | arxiv=astro-ph/0603836

| bibcode=2006ApJ...646..523R | s2cid=5669768 }}

{{cite journal

| title=On the ejection of Earth-mass planets from the habitable zones of the solar twins HD 20782 and HD 188015

| display-authors=1 | last1=Yeager | first1=K. E.

| last2=Eberle | first2=J. | last3=Cuntz | first3=M.

| journal=International Journal of Astrobiology

| volume=10 | issue=1 | pages=1–13 | date=January 2011

| doi=10.1017/S1473550410000145 | bibcode=2011IJAsB..10....1Y | s2cid=119625844 }}

}}

External links

  • {{cite encyclopedia | url=http://exoplanet.eu/star.php?st=HD+188015 | archive-url=https://web.archive.org/web/20071106055454/http://exoplanet.eu/star.php?st=HD+188015 | url-status=dead | archive-date=November 6, 2007 | encyclopedia=Extrasolar Planets Encyclopaedia | title=Notes for star HD 188015 }}

{{Stars of Vulpecula}}

Category:G-type subgiants

Category:Planetary systems with one confirmed planet

Category:Vulpecula

Category:Durchmusterung objects

188015

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