HD 9446

{{Short description|Star with a planetary system in the constellation Triangulum}}

{{Starbox observe

| epoch = J2000

| constell = Triangulum

| ra = {{RA|01|33|20.1847}}

| dec = {{DEC|+29|15|54.539}}

| appmag_v = 8.35

}}

{{Starbox character

| type =

| class = G5V

| b-v = {{Val|+0.680|0.015}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+21.2|3.1}}

| prop_mo_ra = {{val|190.343|(28)}}

| prop_mo_dec = {{val|−53.675|(31)}}

| parallax = 19.9200

| p_error = 0.0413

| parallax_footnote =

| absmag_v = 4.76

}}

{{Starbox detail

| mass = {{Val|1.07|0.18}}

| radius = {{val|0.984|0.01}}

| gravity = {{Val|4.53|0.16}}

| luminosity = 1.1

| temperature = {{Val|5793|22|fmt=commas}}

| metal_fe = {{Val|0.09|0.05}}

| age_gyr = {{Val|2.0|1.5}}

| rotational_velocity = {{Val|4|1}}

}}

{{Starbox catalog

| names = {{odlist | BD=+28°253 | HD=9446 | HIP=7245 | SAO=74788 }}

}}

{{Starbox reference

| Simbad = HD+9446

| NSTED = HD 9446

| EPE = HD+9446

}}

{{Starbox end

}}

HD 9446 is a star located about 164 light-years away in the constellation of Triangulum, near the southwestern constellation border with Pisces. This object can be viewed with binoculars or a telescope, but it is too faint to be seen with the naked eye at its apparent visual magnitude of 8.35. It is drifting further away from the Sun with a radial velocity of +21 km/s.

This object is a G-type main sequence star with a stellar classification of G5V. The physical properties this star appear similar to the Sun, making it a candidate solar analog. However, the measured abundance of elements with more mass than helium is outside the accepted range. It is roughly two billion years in age and has an active chromosphere. The amount of activity measured in the chromosphere corresponds to a star with a rotation period of about 10 days.

On 5 January 2010, scientists announced the discovery of two planets orbiting around HD 9446. In addition, another exoplanet candidate is detected by astrometry in 2024.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = ≥ {{val|0.687|0.0056}}

| period = {{val|30.0608|0.0034|0.0033}}

| semimajor = {{val|0.1892|0.0065}}

| eccentricity = {{val|0.20|0.06}}

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = ≥ {{val|1.71|0.13}}

| period = {{val|189.6|0.13}}

| semimajor = {{val|0.646|0.022}}

| eccentricity = {{val|0.06|0.06}}

}}

{{OrbitboxPlanet hypothetical

| exoplanet = d

| mass = 1.5

| semimajor = 7.0

| period =

| eccentricity =

}}

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 journal |last1=Hill |first1=Michelle L. |last2=Mocnik |first2=Teo |last3=Kane |first3=Stephen R. |last4=Henry |first4=Gregory W. |last5=Pepper |first5=Joshua |last6=Hinkel |first6=Natalie R. |last7=Dalba |first7=Paul A. |last8=Fulton |first8=Benjamin J. |last9=Stassun |first9=Keivan G. |last10=Rosenthal |first10=Lee J. |last11=Howard |first11=Andrew W. |last12=Howell |first12=Steve B. |last13=Everett |first13=Mark E. |last14=Boyajian |first14=Tabetha S. |last15=Fischer |first15=Debra A. |date=2020-05-01 |title=Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems |arxiv=2003.02385 |journal=The Astronomical Journal |volume=159 |issue=5 |pages=197 |doi=10.3847/1538-3881/ab7d33 |doi-access=free |bibcode=2020AJ....159..197H |issn=0004-6256}}

{{cite journal

| title=Revising the ages of planet-hosting stars

| url=http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html

| last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.

| last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=575 | at=A18 | year=2015

| arxiv=1411.4302 | bibcode=2015A&A...575A..18B

| doi=10.1051/0004-6361/201424951 | s2cid=54555839

}}

{{cite journal

|doi=10.1051/0004-6361/200913790

|last1=Hébrard |first1=Guillaume

|last2=Bonfils |first2=Xavier

|last3=Ségransan |first3=Damien

|last4=Moutou |first4=Claire

|last5=Delfosse |first5=Xavier

|last6=Bouchy |first6=François

|last7=Boisse |first7=Isabelle

|last8=Arnold |first8=Luc

|date=2010

|title=The SOPHIE Search for Northern Extrasolar Planets: II. A Multi-planet System Around HD 9446

|journal=Astronomy & Astrophysics

|volume=513

|pages=A69

|url=http://www.aanda.org/articles/aa/full_html/2010/05/aa13790-09/aa13790-09.html

|bibcode=2010A&A...513A..69H

|arxiv=1001.0682

|s2cid=119306916 }}

{{citation

| last1=Meléndez | first1=J. | last2=Schuster | first2=W. J.

| last3=Silva | first3=J. S. | last4=Ramírez | first4=I.

| last5=Casagrande | first5=L. | last6=Coelho | first6=P.

| title=uvby-β photometry of solar twins. The solar colors, model atmospheres, and the Teff and metallicity scales

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=522 | pages=A98 | date=November 2010

| bibcode=2010A&A...522A..98M | arxiv=1007.5351

| doi=10.1051/0004-6361/201014741

| s2cid=118481647 | url=https://zenodo.org/record/998268 }}

{{cite journal|last1=Kiefer|first1=Flavien|last2=Lagrange|first2=Anne-Marie|last3=Rubini|first3=Pascal|last4=Philipot|first4=Florian|title=Searching for substellar companion candidates with Gaia. II. A catalog of 9,698 planet candidate solar-type hosts|year=2024|journal=Astronomy and Astrophysics|volume=|issue=|page=|doi=10.1051/0004-6361/202451745|bibcode=|arxiv=2409.16993}}

}}

Category:G-type main-sequence stars

Category:Planetary systems with two confirmed planets

Category:Triangulum

Category:Durchmusterung objects

009446

007245

HD 9446

See also

References