HD 79498

{{Starbox begin

| name = HD 79498

}}

{{Starbox observe

| epoch = J2000.0

| constell = Cancer

| component =

| ra = {{RA|09|15|09.4020}}

| dec = {{DEC|+23|22|31.979}}

| appmag_v = 8.05

}}

{{Starbox character

| type = main sequence

| class = G5 V + M0 V

| b-v =

| u-b =

| variable = None

}}

{{Starbox astrometry

| radial_v = {{val|19.94|0.14}}

| prop_mo_ra = −127.013

| prop_mo_dec = −155.703

| parallax = 20.5658

| p_error = 0.0198

| parallax_footnote =

| absmag_v = 4.62

}}

{{Starbox detail

| source =

| component1 = Primary (A)

| mass = 1.08

| radius = 1.05

| luminosity = 1.07

| temperature = 5,800

| metal_fe = +0.21

| gravity = 4.43

| rotational_velocity = 2.0

| age_gyr = 2.8

| component2 = Secondary (B)

| temperature2 = 3,881

| metal_fe2 = 0.18

}}

{{Starbox catalog

| names = {{odlist|BD=+23°2063|HIP=45406|SAO=80717|HD=79498|2MASS=J09150941+2322323}}

}}

{{Starbox reference

| Simbad = HD+79498

}}

HD 79498 is a double star in the northern constellation of Cancer. The primary component of this pair has an orbiting exoplanet companion. This star is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.05. The system is located at a distance of 159 light years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 20 km/s. It has a relatively high proper motion, traversing the celestial sphere at an angular rate of {{val|0.2|ul=arcsecond}}·yr⁻¹.

The primary, designated component A, is a G-type main-sequence star with a stellar classification of G5 V. It has 8% greater mass compared to the Sun and a 5% larger girth. The star is estimated to be 2.8 billion years old and appears to be spinning slowly with a projected rotational velocity of 2.0 km/s. It has a higher than solar abundance of elements other than hydrogen and helium; what astronomers term a metal-rich star. The star is radiating 7% more luminosity than the Sun from its photosphere at an effective temperature of 5,800 K. There appears to be only a low level of magnetic activity in the star's chromosphere.

The secondary member, component B, is located at a projected separation of {{val|2900|ul=AU|fmt=commas}} from the primary. It is a small red dwarf of spectral class M0 V.

Planetary system

The McDonald Observatory planet search program discovered an exoplanet orbiting the primary in 2011 using the radial velocity method.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = Ab

| mass = ≥1.34 ± 0.07

| period = 1966 ± 41

| semimajor = 3.13 ± 0.08

| eccentricity = 0.59 ± 0.02

}}

References

{{reflist|refs=

{{cite journal |bibcode=2018A&A...614A..55A |title=Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert |journal=Astronomy and Astrophysics |volume=614 |pages=A55 |last1=Aguilera-Gómez |first1=Claudia |last2=Ramírez |first2=Iván |last3=Chanamé |first3=Julio |year=2018 |arxiv=1803.05922 |doi=10.1051/0004-6361/201732209 |s2cid=62799777 }}

{{cite journal | title=Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810 | last1=Ment | first1=Kristo | last2=Fischer | first2=Debra A. | last3=Bakos | first3=Gaspar | last4=Howard | first4=Andrew W. | last5=Isaacson | first5=Howard | display-authors=1 | journal=The Astronomical Journal | volume=156 | issue=5 | at=213 | year=2018 | arxiv=1809.01228 | bibcode=2018AJ....156..213M | doi=10.3847/1538-3881/aae1f5 | s2cid=119243619 | doi-access=free }}

{{cite journal | display-authors=1 |last1=Llorente de Andrés |first1=F. |last2=Chavero |first2=C. |last3=de la Reza |first3=R. |last4=Roca-Fàbrega |first4=S. |last5=Cifuentes |first5=C. |title=The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert |journal=Astronomy and Astrophysics |date=October 2021 |volume=654 |pages=A137 |doi=10.1051/0004-6361/202141339 |bibcode=2021A&A...654A.137L |issn=0004-6361 |arxiv=2108.05852 |doi-access=free}}

{{cite journal

| title=Calibrating the metallicity of M dwarfs in wide physical binaries with F-, G-, and K-primaries - I: High-resolution spectroscopy with HERMES: stellar parameters, abundances, and kinematics

| last1=Montes | first1=D. | last2=González-Peinado | first2=R.

| last3=Tabernero | first3=H. M. | last4=Caballero | first4=J. A.

| last5=Marfil | first5=E. | last6=Alonso-Floriano | first6=F. J.

| last7=Cortés-Contreras | first7=M. | last8=González Hernández | first8=J. I.

| last9=Klutsch | first9=A. | last10=Moreno-Jódar | first10=C.

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

| volume=479 | issue=1 | pages=1332–1382 | date=September 2018

| doi=10.1093/mnras/sty1295 | doi-access=free | arxiv=1805.05394

| bibcode=2018MNRAS.479.1332M | s2cid=119260219 }}

{{cite journal |bibcode=2018A&A...616A.108B |title=Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles | display-authors=1 |last1=Boro Saikia |first1=S. |last2=Marvin |first2=C. J. |last3=Jeffers |first3=S. V. |last4=Reiners |first4=A. |last5=Cameron |first5=R. |last6=Marsden |first6=S. C. |last7=Petit |first7=P. |last8=Warnecke |first8=J. |last9=Yadav |first9=A. P. |journal=Astronomy and Astrophysics |year=2018 |volume=616 |page=616 |doi=10.1051/0004-6361/201629518 |arxiv=1803.11123 |s2cid=118915212 }}

{{cite journal | display-authors=1 | last1=Robertson | first1=Paul | last2=Endl | first2=Michael | last3=Cochran | first3=William D. | last4=MacQueen | first4=Phillip J. | last5=Wittenmyer | first5=Robert A. | last6=Horner | first6=J. | last7=Brugamyer | first7=Erik J. | last8=Simon | first8=Attila E. | last9=Barnes | first9=Stuart I. | last10=Caldwell | first10=Caroline | title=The McDonald Observatory Planet Search: New Long-period Giant Planets and Two Interacting Jupiters in the HD 155358 System | journal=The Astrophysical Journal | volume=749 | issue=1 | page=39 |date=April 2012 | doi=10.1088/0004-637X/749/1/39 | bibcode=2012ApJ...749...39R | arxiv=1202.0265 | s2cid=59273311 }}

{{cite journal | first=Jean | last=Schneider | title=Planet HD 79498 b | date=1995 | url=https://exoplanet.eu/catalog/hd_79498_b--1091/ | work=Extrasolar Planets Encyclopaedia | access-date=2012-08-22 }}

{{cite journal

| title=CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS

| last1=Alonso-Floriano | first1=F. J. | last2=Morales | first2=J. C.

| last3=Caballero | first3=J. A. | last4=Montes | first4=D.

| last5=Klutsch | first5=A. | last6=Mundt | first6=R.

| last7=Cortés-Contreras | first7=M. | last8=Ribas | first8=I.

| last9=Reiners | first9=A. | last10=Amado | first10=P. J.

| last11=Quirrenbach | first11=A. | last12=Jeffers | first12=S. V.

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

| volume=577 | id=A128 | pages=19 | date=May 2015

| doi=10.1051/0004-6361/201525803 | arxiv=1502.07580

| bibcode=2015A&A...577A.128A | s2cid=53135130 }}