HD 128311 c

{{Infobox planet

| name = HD 128311 c

| discoverer = Vogt et al.

| discovery_site = {{flagicon|USA}} California, United States

| discovered = June 24, 2005

| discovery_method = Doppler spectroscopy

| orbit_ref =

| apsis = astron

| aphelion = {{convert|2.02|AU|km|abbr=on}}

| perihelion = {{convert|1.46|AU|km|abbr=on}}

| semimajor = {{convert|1.740|±|0.010|AU|km|abbr=on}}

| eccentricity = {{val|0.159|0.006}}

| period = {{convert|921.538|±|1.15|d|yr|abbr=on}}

| avg_speed = 20.7

| time_periastron = {{val|2449565.615|18.01}}

| arg_peri = {{val|15.445|6.87}}

| semi-amplitude = {{val|74.799|1.497}}

| star = HD 128311

| inclination = {{val|55.950|14.553}}

| asc_node = {{val|229.392|14.473}}

| physical_ref =

| mass = {{val|3.789|0.924|0.432|ul=Jupiter mass}}

}}

HD 128311 c is an exoplanet located approximately 54 light-years away in the constellation of Boötes. This planet orbits in an eccentric orbit at 1.74 AU from its star (HD 128311). The planet has a minimum mass of 3.22 {{Jupiter mass|link=y}}, and astrometric observations in 2014 revealed its true mass to be 3.789 {{Jupiter mass|link=y}}.

References

{{Reflist|refs=

{{cite journal | title=Five New Multicomponent Planetary Systems | last1=Vogt | first1=Steven S. | last2=Butler | first2=R. Paul | last3=Marcy | first3=Geoffrey W. | 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 | year=2005 | volume=632 | issue=1 | pages=638–658 | doi=10.1086/432901 | bibcode=2005ApJ...632..638V| s2cid=16509245 | url=https://authors.library.caltech.edu/36250/1/0004-637X_632_1_638.pdf }}

{{cite journal | title=Astrometry, Radial Velocity, and Photometry: The HD 128311 System Remixed with Data from HST, HET, and APT | last1=McArthur | first1=Barbara E. | display-authors=etal | journal=The Astrophysical Journal | year=2014 | volume=795 | issue=1 | page=41 | doi=10.1088/0004-637X/795/1/41 | bibcode=2014ApJ...795...41M | s2cid=122980723 | doi-access=free }}

}}

External links

{{cite encyclopedia| url=https://exoplanet.eu/catalog/hd_128311_c--266/ | encyclopedia=Extrasolar Planets Encyclopaedia | title=Notes for planet HD 128311 c | access-date=2008-08-18}}
{{cite web | url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+128311 | title=HD 128311 | work=Exoplanets | access-date=2008-08-18 | archive-url=https://web.archive.org/web/20080514224054/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+128311 | archive-date=2008-05-14 | url-status=dead }}

Category:Boötes

Category:Giant planets

Category:Exoplanets discovered in 2005

Category:Exoplanets detected by radial velocity

Category:Exoplanets detected by astrometry