HD 129445

{{Starbox observe

| epoch = J2000.0

| constell = Circinus

| ra = {{RA|14|46|03.06521}}

| dec = {{DEC|–68|45|45.8797}}

| appmag_v = 8.80

}}

{{Starbox character

| class = G6 V

| appmag_1_passband = B

| appmag_1 = 9.556

| appmag_2_passband = J

| appmag_2 = {{val|7.531|0.023}}

| appmag_3_passband = H

| appmag_3 = {{val|7.243|0.027}}

| appmag_4_passband = K

| appmag_4 = {{val|7.167|0.026}}

| b-v = {{val|0.756|0.002}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|+8.56|0.13}}

| prop_mo_ra = –197.892

| prop_mo_dec = –57.069

| pm_footnote =

| parallax = 14.9136

| p_error = 0.0147

| parallax_footnote =

| absmag_v = 4.73

}}

{{Starbox detail

| source =

| mass = {{val|1.06|0.03|0.05}}

| radius = {{val|1.18|0.01}}

| gravity = {{val|4.39|0.08}}

| luminosity = {{val|1.229|0.005|0.004}}

| temperature = {{val|5605|21|34|fmt=commas}}

| metal_fe = {{val|0.36|0.10}}

| age_gyr = {{val|4.94|3.77|2.04}}

| rotational_velocity = 1.4

}}

{{Starbox catalog

| names = {{odlist | CD=–68°1403 | HD=129445 | HIP=72203 | LTT=5856 | NLTT=38236 | PPM=360965 }}

}}

{{Starbox reference

| Simbad = HD+129445

| NSTED = HD 129445

| EPE = HD+129445

}}

HD 129445 (HIP 72203; LTT 5856) is a star located in the southern constellation Circinus. It has an apparent magnitude of 8.80, making it faintly visible in binoculars but not to the naked eye. The object is located relatively close at a distance of 219 light-years based on Gaia DR3 parallax measurements but it is drifting away with a spectroscopic radial velocity of {{val|8.56|ul=km/s}}. It has an absolute magnitude of +4.73, which is similar to the Sun's absolute magnitude of 4.83.

Physical characteristics

HD 129445 has a stellar classification of G6 V, indicating that it is an ordinary G-type main-sequence star like the Sun, albeit a bit cooler. It has 106% the mass of the Sun and 118% the radius of the Sun. It radiates 1.23 times the luminosity of the Sun from its photosphere at an effective temperature of {{val|5605|ul=K|fmt=commas}}, giving it a yellow hue when viewed in the night sky. HD 129445 is extremely metal enriched with an iron abundance more than twice of that of the Sun's and it spins slowly with a projected rotational velocity of {{val|1.4|ul=km/s}}. It is slightly older than the Sun at the age of 4.94 billion years.

Planetary system

The star was observed by the Magellan Planet Search Program due to its absolute visual magnitude and high metallicity. The Magellan program conducted 17 doppler velocity measurements, which spans a full orbital period. The results led the program to detect a planet dubbed HD 129445 b. In 2023, the inclination and true mass of HD 129445 b were determined via astrometry.

{{OrbitboxPlanet begin

| table_ref =

| period_unit = year

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|2.51|1.1|0.54}}

| period = {{val|4.933|0.093|0.13}}

| semimajor = {{val|2.984|0.039|0.054}}

| eccentricity = {{val|0.572|0.087|0.086}}

| inclination = {{val|52|24|19}} or {{val|128|19|24}}

}}

References

{{Reflist|refs=

{{cite simbad

| title=HD 129445 | access-date=2021-03-22 }}

{{cite book

| last=Houk |first=Nancy

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

| volume=1 | year=1979 | location=Ann Arbor, Michigan

| publisher=Department of Astronomy, University of Michigan

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

{{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=Chromospheric activities and kinematics for solar type dwarfs and subgiants: analysis of the activity distribution and the AVR

| display-authors=1 | last1=Jenkins | first1=J. S.

| last2=Murgas | first2=F. | last3=Rojo | first3=P.

| last4=Jones | first4=H. R. A. | last5=Day-Jones | first5=A. C.

| last6=Jones | first6=M. I. | last7=Clarke | first7=J. R. A.

| last8=Ruiz | first8=M. T. | last9=Pinfield | first9=D. J.

| journal=Astronomy & Astrophysics

| volume=531 | id=A8 | pages=15 | date=July 2011

| arxiv=1103.0584 | bibcode=2011A&A...531A...8J

| doi=10.1051/0004-6361/201016333 | s2cid=55800969 }}

{{cite journal

| title=Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert

| display-authors=1 | last1=Aguilera-Gómez | first1=Claudia

| last2=Ramírez | first2=Iván | last3=Chanamé | first3=Julio

| journal=Astronomy & Astrophysics

| volume=614 | id=A55 | pages=15 | date=June 2018

| doi=10.1051/0004-6361/201732209 | s2cid=62799777

| arxiv=1803.05922 | bibcode=2018A&A...614A..55A }}

{{cite journal

| title=Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program

| last1=Arriagada | first1=Pamela | last2=Butler | first2=R. Paul

| last3=Minniti | first3=Dante | last4=López-Morales | first4=Mercedes

| last5=Shectman | first5=Stephen A. | last6=Adams | first6=Fred C.

| last7=Boss | first7=Alan P. | last8=Chambers | first8=John E.

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

| volume=711 | issue=2 | pages=1229–35 | date=2010

| arxiv=1001.4093 | bibcode=2010ApJ...711.1229A

| doi=10.1088/0004-637X/711/2/1229 | s2cid=118682009 }}

{{cite web

| title=Estrella del Anfitrión: HD 129445

| url=http://planetquest1.jpl.nasa.gov/atlas_espanol/atlas_profile.cfm?Planet=576| work= Planet Quest

| access-date=2010-02-12 | url-status=dead

| archive-url=https://web.archive.org/web/20100704234649/http://planetquest1.jpl.nasa.gov/atlas_espanol/atlas_profile.cfm?Planet=576

| archive-date= 2010-07-04}}

{{cite web

| title= HD 129445

| url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+129445

| work=Exoplanets | accessdate=2010-02-12

| archive-url=https://web.archive.org/web/20100317230603/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+129445

| archive-date=2010-03-17 | url-status=dead }}

{{cite journal |last1=Xiao |first1=Guang-Yao |last2=Liu |first2=Yu-Juan |display-authors=etal |date=May 2023 |title=The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements |journal=Research in Astronomy and Astrophysics |volume=23 |issue=5 |pages=055022 |doi=10.1088/1674-4527/accb7e |arxiv=2303.12409 |bibcode=2023RAA....23e5022X}}

}}

Category:G-type main-sequence stars

Category:Planetary systems with one confirmed planet

HD 129445

Physical characteristics

Planetary system

See also

References