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HD 187123

{{short description|Star in the constellation Cygnus}}

{{Starbox begin}}

{{Starbox image

| image = 250px

| caption = HD 187123 has a planetary system with at least two planets in it. Artist's rendition of planets HD 187123 b and c.

| credit =

}}

{{Starbox observe

| epoch = J2000.0

| constell = Cygnus

| ra = {{RA|19|46|58.1122}}

| dec = {{DEC|+34|25|10.281}}

| appmag_v = 7.83

}}

{{Starbox character

| type =

| class = G2V

| b-v = {{val|0.661|0.010}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|−16.91|(12)}}

| prop_mo_ra = {{val|142.591|(15)}}

| prop_mo_dec = {{val|−123.715|(18)}}

| pm_footnote =

| parallax = 21.7166

| p_error = 0.0157

| parallax_footnote =

| absmag_v = 4.41

}}

{{Starbox detail

| source =

| mass = {{val|1.06|0.02}}

| radius = {{val|1.17|0.03}}

| gravity = {{val|4.32|0.03}}

| luminosity = {{val|1.44|0.02}}

| temperature = {{val|5853|53|fmt=commas}}

| metal_fe = {{val|0.121|0.030}}

| age_gyr = {{val|5.6|1.3}}

| rotational_velocity = {{val|2.15|0.50}}

}}

{{Starbox catalog

| names = {{odlist | BD=+34°3708 | HD=187123 | HIP=97336 | LTT=15779 | SAO=68845 }}

}}

{{Starbox reference

| Simbad = HD+187123

| ARICNS =

}}

{{Starbox end}}

HD 187123 is a single, yellow-hued star with two exoplanetary companions in the northern constellation of Cygnus. It has an apparent visual magnitude of 7.83, making it an 8th magnitude star that is too faint to be visible with the naked eye. However, it should be easy target with binoculars or small telescope. The system is located at a distance of 150 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −17 km/s.

Description

This is an ordinary G-type main-sequence star with a stellar classification of G2V. The physical properties of this star are sufficiently similar to the Sun that it has been considered a solar analog, although the metallicity is higher. It is estimated to be five or six billion years old and is spinning with a projected rotational velocity of 2 km/s. The star has a similar mass to the Sun but is slightly larger with 117% of the Sun's radius. It is radiating 1.44 times the luminosity of the Sun from its photosphere at an effective temperature of 5,853 K.

Planetary system

In 1998 the California and Carnegie Planet Search team, after following a suggestion by Kevin Apps, a Briton who at the time was an undergraduate student found a possible planet orbiting the star. There were also indications of another, more distant body orbiting the star and this claim was published in 2006. This planet was confirmed in 2009. The presence of water has been detected in the atmosphere of HD 187123 b with high confidence.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|0.5074|0.0026|p=>}}

| semimajor = {{val|0.04213|0.00034}}

| period = {{val|3.0965886|0.0000043}}

| eccentricity = {{val|0.0093|0.0046}}

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|1.818|0.035|p=>}}

| semimajor = {{val|4.417|0.054}}

| period = {{val|3324|46}}

| eccentricity = {{val|0.280|0.022}}

}}

{{Orbitbox end}}

See also

References

{{Reflist|refs=

{{cite simbad

| title=HD 187123 | access-date=2021-10-14 }}

{{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=The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars

| display-authors=1 | last1=Gray | first1=R. O.

| last2=Napier | first2=M. G. | last3=Winkler | first3=L. I.

| journal=The Astronomical Journal

| volume=121 | issue=4 | pages=2148 | year=2001

| doi=10.1086/319956 | bibcode=2001AJ....121.2148G | s2cid=117076031 | doi-access= }}

{{cite news

| title=British student shows Nasa new planet

| url=http://news.bbc.co.uk/1/hi/sci/tech/179909.stm

| work=BBC News | date=September 25, 1998

| access-date=December 31, 2011 }}

{{cite journal

| title=A Planet with a 3.1 Day Period around a Solar Twin

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

| last3=Vogt | first3=Steven S. | last4=Apps | first4=Kevin

| display-authors=1 | journal=Publications of the Astronomical Society of the Pacific

| volume=110 | issue=754 | pages=1389–1393 | year=1998

| bibcode=1998PASP..110.1389B | doi=10.1086/316287

| citeseerx=10.1.1.37.5463 | s2cid=16360564 }}

{{cite journal

| title=The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets

| last1=Feng | first1=Y. Katherina | last2=Wright | first2=Jason T.

| last3=Nelson | first3=Benjamin | last4=Wang | first4=Sharon X.

| last5=Ford | first5=Eric B. | last6=Marcy | first6=Geoffrey W.

| last7=Isaacson | first7=Howard | last8=Howard | first8=Andrew W.

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

| volume=800 | issue=1 | at=22 | year=2015

| arxiv=1501.00633 | bibcode=2015ApJ...800...22F

| doi=10.1088/0004-637X/800/1/22 | s2cid=56390823 }}

{{Cite Gaia DR3|2047452661412980736}}

{{cite journal

| title=Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars

| last1=Wright | first1=J. T. | last2=Marcy | first2=G. W.

| last3=Fischer | first3=D. A | last4=Butler | first4=R. P.

| last5=Vogt | first5=S. S. | last6=Tinney | first6=C. G.

| last7=Jones | first7=H. R. A. | last8=Carter | first8=B. D.

| last9=Johnson | first9=J. A. | display-authors=1

| journal=The Astrophysical Journal

| volume=657 | issue=1 | pages=533–545 | year=2007

| arxiv=astro-ph/0611658 | bibcode=2007ApJ...657..533W

| doi=10.1086/510553 | s2cid=35682784 }}

{{cite journal

| title=Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems

| last1=Wright | first1=J. T. | last2=Upadhyay | first2=S.

| last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A.

| last5=Ford | first5=Eric B. | last6=Johnson | first6=John Asher

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

| volume=693 | issue=2 | pages=1084–1099 | year=2009

| arxiv=0812.1582 | bibcode=2009ApJ...693.1084W

| doi=10.1088/0004-637X/693/2/1084 | s2cid=18169921 }}

{{cite journal

| title=Simulating the Multi-epoch Direct Detection Technique to Isolate the Thermal Emission of the Non-transiting Hot Jupiter HD187123b

| last1=Buzard | first1=Cam | last2=Finnerty | first2=Luke

| last3=Piskorz | first3=Danielle | last4=Pelletier | first4=Stefan

| last5=Benneke | first5=Björn | last6=Bender | first6=Chad F.

| last7=Lockwood | first7=Alexandra C. | last8=Wallack | first8=Nicole L.

| last9=Wilkins | first9=Olivia H. | last10=Blake | first10=Geoffrey A.

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

| volume=160 | issue=1 | id=1 | pages=13 | date=July 2020

| doi=10.3847/1538-3881/ab8f9c | arxiv=2005.03020

| bibcode=2020AJ....160....1B | s2cid=218538482 | doi-access=free }}

{{cite journal

| title=Age consistency between exoplanet hosts and field stars

| display-authors=1 | 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=The Top Ten solar analogs in the ELODIE library

| last1=Soubiran | first1=C. | last2=Triaud | first2=A.

| journal=Astronomy and Astrophysics

| volume=418 | pages=1089–1100 | date=May 2004

| issue=3 | doi=10.1051/0004-6361:20035708 | arxiv=astro-ph/0402094

| bibcode=2004A&A...418.1089S }}

{{cite journal

| title=A lucky imaging multiplicity study of exoplanet host stars

| last1=Ginski | first1=C. | last2=Mugrauer | first2=M.

| last3=Seeliger | first3=M. | last4=Eisenbeiss | first4=T.

| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society

| volume=421 | issue=3 | pages=2498–2509 | date=April 2012

| doi=10.1111/j.1365-2966.2012.20485.x | doi-access=free | arxiv=1202.4586

| bibcode=2012MNRAS.421.2498G }}

}}

External links

  • {{cite encyclopedia | url=http://exoplanet.eu/star.php?st=HD+187123 | archive-url=https://web.archive.org/web/20060620235324/http://exoplanet.eu/star.php?st=HD+187123 | url-status=dead | archive-date=June 20, 2006 | encyclopedia=Extrasolar Planets Encyclopaedia | title=Notes for star HD 187123 | access-date=2008-08-25}}

{{Sky|19|46|58.1130|+|34|25|10.288|156.28}}

{{Stars of Cygnus}}

Category:G-type main-sequence stars

Category:Solar analogs

Category:Planetary systems with two confirmed planets

Category:Cygnus (constellation)

Category:Durchmusterung objects

187123

097336