HD 66428

{{Starbox begin

| name = HD 66428

}}

{{Starbox observe

| epoch = J2000.0

| constell = Monoceros

| ra = {{RA|08|03|28.66767}}

| dec = {{DEC|-01|09|45.7581}}

| appmag_v = 8.25

}}

{{Starbox character

| class = G5

| r-i =

| v-r =

| b-v =

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|44.26|0.13}}

| prop_mo_ra = {{val|-65.766|0.029}}

| prop_mo_dec = {{val|-206.999|0.019}}

| pm_footnote =

| parallax = 18.7661

| p_error = 0.0312

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = 1.09 ± 0.02

| radius = 1.13 ± 0.03

| luminosity = 1.28 ± 0.01

| gravity = 4.37 ± 0.03

| temperature = 5773 ± 55

| metal_fe =

| rotation =

| rotational_velocity =

| age_gyr = 4.1 ± 1.4

}}

{{Starbox catalog

| names = BD−00°1891, HIP 39417, LTT 3038, SAO 135426

}}

{{Starbox reference

| Simbad = HD+66428

}}

HD 66428 is a G-type main sequence star located approximately 174 light-years away in the constellation of Monoceros. This star is similar to the Sun with an apparent magnitude of 8.25, an effective temperature of 5705 ± 27 K and a solar luminosity 1.28.

Its absolute magnitude is 11.1 while its U-V color index is 0.71. It is considered an inactive star and it is metal-rich ([Fe/H] = 0.310).

This star has a precise mass of 1.14552 solar masses. This precision comes from the Corot mission that measured asteroseismology.

Planetary system

In July 2006, the discovery of the extrasolar planet HD 66428 b was published in the Astrophysical Journal. It was found from observations at the W. M. Keck Observatory using the radial velocity method. It has a minimum mass of more than 3 times that of Jupiter and orbits at a distance of 3.47 AU away from the star.

In 2015 a refined orbit was determined which led to the discovery of a linear trend in the radial velocities indicating a more distant companion of unknown character, which was determined to be a gas giant planet HD 66428 c or brown dwarf in 2021.{{citation|arxiv=2105.11583|year=2021|title=The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades|last1=Rosenthal|first1=Lee J.|last2=Fulton|first2=Benjamin J.|last3=Hirsch|first3=Lea A.|last4=Isaacson|first4=Howard T.|last5=Howard|first5=Andrew W.|last6=Dedrick|first6=Cayla M.|last7=Sherstyuk|first7=Ilya A.|last8=Blunt|first8=Sarah C.|last9=Petigura|first9=Erik A.|last10=Knutson|first10=Heather A.|last11=Behmard|first11=Aida|last12=Chontos|first12=Ashley|last13=Crepp|first13=Justin R.|last14=Crossfield|first14=Ian J. M.|last15=Dalba|first15=Paul A.|last16=Fischer|first16=Debra A.|last17=Henry|first17=Gregory W.|last18=Kane|first18=Stephen R.|last19=Kosiarek|first19=Molly|last20=Marcy|first20=Geoffrey W.|last21=Rubenzahl|first21=Ryan A.|last22=Weiss|first22=Lauren M.|last23=Wright|first23=Jason T.|journal=The Astrophysical Journal Supplement Series |volume=255 |issue=1 |page=8 |doi=10.3847/1538-4365/abe23c |bibcode=2021ApJS..255....8R |s2cid=235186973 |doi-access=free }} In 2022, the inclination and true mass of both planets were measured via astrometry. The orbital period and mass of planet c were found to be significantly lower than the previous higher-error estimates, showing it to be planetary mass and not a brown dwarf.

{{OrbitboxPlanet begin

| table_ref =

| period_unit = year

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|10.946|2.442|3.845}}

| semimajor = {{val|3.395|0.141|0.157}}

| period = {{val|6.214|0.015|0.016}}

| eccentricity = {{val|0.471|0.012}}

| inclination = {{val|16.639|10.121|2.959}}

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|1.764|3.404|0.041}}

| semimajor = {{val|9.408|1.945|1.267}}

| period = {{val|28.690|9.206|5.348}}

| eccentricity = {{val|0.207|0.097|0.098}}

| inclination = {{val|93.938|57.003|55.476}}

}}

References

{{Reflist|refs=

{{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 | title=Catalog of Nearby Exoplanets | last1=Butler | first1=R. P. | last2=Wright | first2=J. T. | last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A. | 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. | last10=McCarthy | first10=C. | last11=Penny | first11=A. J. | display-authors=1 | journal=The Astrophysical Journal | volume=646 | issue=1 | pages=505–522 | year=2006 | doi=10.1086/504701 | bibcode=2006ApJ...646..505B | arxiv=astro-ph/0607493 | s2cid=119067572 }}

{{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 journal | title=Extrasolar Giant Planets and X-Ray Activity | last1=Kashyap | first1=V.L. | last2=Drake | first2=Jeremy J. | last3=Saar | first3=Steven H. | display-authors=1 | journal=Astrophysical Journal | volume=687 | issue=2 | pages=1339–1356 | year=2008 | arxiv=0807.1308 | bibcode=2008ApJ...687.1339K | doi=10.1086/591922 | s2cid=17515630 }}

{{cite journal | title=Spectroscopic parameters for 451 stars in the HARPS GTO planet search program | last1=Sousa | first1=S.G. | last2=Santos | first2=N. C. | last3=Mayor | first3=M. | last4=Udry | first4=S. | last5=Casagrande | first5=L. | last6=Israelian | first6=G. | last7=Pepe | first7=F. | last8=Queloz | first8=D. | last9=Monteiro | first9=M. J. P. F. G. | display-authors=1 | journal=Astronomy and Astrophysics | volume=487 | pages=373–381 | year=2008 | issue=1 | arxiv=0805.4826 | bibcode=2008A&A...487..373S | doi=10.1051/0004-6361:200809698 | s2cid=18173201 }}

{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=The Astrophysical Journal Supplement Series |volume=262 |issue=21 |page=21 |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F|s2cid=251864022 |doi-access=free }}

}}

External links

{{cite encyclopedia | url=http://exoplanet.eu/star.php?st=HD+66428 | archive-url=https://web.archive.org/web/20070811004520/http://exoplanet.eu/star.php?st=HD+66428 | url-status=dead | archive-date=August 11, 2007 | encyclopedia=Extrasolar Planets Encyclopaedia | title=Notes for star HD 66428 | access-date=2008-08-20}}

Category:G-type main-sequence stars

066428

039417

Category:Monoceros

Category:Planetary systems with two confirmed planets

Category:Durchmusterung objects

HD 66428

Planetary system

See also

References

External links