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| gravity = 3.20{{R|luhn19}}
| gravity = 3.20{{R|luhn19}}
| metal_fe = {{val|-0.06|0.03}}{{R|johnson11}}
| metal_fe = {{val|-0.06|0.03}}{{R|johnson11}}
| temperature = 4895{{R|luhn19}}
| temperature = 4895{{R|luhn19}} / 4982 ± 44<ref name="ngo17"/>
| rotation =
| rotation =
| rotational_velocity = 2.85{{R|johnson11}}
| rotational_velocity = 2.85{{R|johnson11}}
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}}
}}
{{Starbox end}}
{{Starbox end}}
'''HD 30856''' (proper name '''Mouhoun''') is a [[Stellar classification#Class K|K-type]] [[giant star]] about 430 [[light-year]]s distant, located in the constellation of [[Eridanus (constellation)|Eridanus]].{{R|new_los|simbad}} A [[super-Jupiter]] [[exoplanet]], HD 30856 b (proper name Nakanbé), is known to orbit the star.{{R|johnson11}}
'''HD 30856''' (proper name '''Mouhoun''') is a [[binary star|binary system]] between HD 30856 A (often simply HD 30856<ref name="johnson11"/><ref name=), a [[Stellar classification#Class K|K-type]] [[giant star]] and a [[red dwarf]] companion, located in the constellation of [[Eridanus (constellation)|Eridanus]] about 430 [[light-year]]s distant.{{R|new_los|simbad}} A [[super-Jupiter]] [[exoplanet]], HD 30856 b (proper name Nakanbé), is known to orbit the primary star.{{R|johnson11}}


== Stellar characteristics ==
== Stellar characteristics ==
HD 30856 A is a giant star with a spectral type of K0 III and a radius of 4.4 {{Solar radius|link=y}}. It has a mass of 1.17 {{Solar mass|link=y}} and an estimated surface temperature of 4,895 K, which gives it an orange color. The star is roughly 10 times as bright as the Sun, which, combined with a distance of 430 light-years, places its [[apparent magnitude]] at 7.91.{{R|esa97|luhn19|johnson11}} The star is aged approximately 3.8 billion years.{{R|johnson11}}
HD 30856 A is a giant star with a spectral type of K0 III and a radius of 4.4 {{Solar radius|link=y}}. It has a mass of 1.17 {{Solar mass|link=y}} and an estimated surface temperature of 4,895 K, which gives it an orange color. The star is roughly 10 times as bright as the Sun, which, combined with a distance of 430 light-years, places its [[apparent magnitude]] at 7.91.{{R|esa97|luhn19|johnson11}} The star is aged approximately 3.8 billion years.{{R|johnson11}}
=== Companion star ===
=== Companion star ===
Through the use of [[adaptive optics]], observations at the [[W. M. Keck Observatory|Keck II telescope]] in Hawaii, another star, designated HD 30856 B, was discovered about 0.8 [[arcsecond]]s east-southeast of HD 30856. Since HD 30856 B shares a very similar [[proper motion]] with HD 30856 A, the two stars are believed to be in a [[Binary star|binary system]].{{R|ngo17}}
Through the use of [[adaptive optics]], observations at the [[W. M. Keck Observatory|Keck II telescope]] in Hawaii, another star, designated HD 30856 B, was discovered about 0.8 [[arcsecond]]s east-southeast of HD 30856.{{R|ngo17}} HD 30856 B has a mass of 0.54 {{Solar mass}} and a temperature of 3700&ndash;4150 K,{{R|ngo17}}{{efn|name=n1}} typical for an [[Stellar classification#Class M|M0V&ndash;M1V]] red dwarf.<ref name="Pecaut2013"/><ref name="Mamajek2021"/><ref name="Cifuentes2020"/>{{efn|name=n2}}

Since the star shares a very similar [[proper motion]] with HD 30856 A, the two stars are believed to be in a binary system. HD 30856 B revolves around the primary star (A) in a wide orbit, with a [[semi-major axis]] of 93 ± 8 [[Astronomical unit|AU]].{{R|ngo17}}


== Nomenclature ==
== Nomenclature ==
Line 80: Line 82:


== Planetary system ==
== Planetary system ==
In 2011, [[radial-velocity method|radial-velocity]] observations made at the [[W. M. Keck Observatory]] revealed the existence of one exoplanet around HD 30856 A.{{R|johnson11}} The planet, HD 30856 Ab (often abbreviated to HD 30856 b), is thought to be a [[gas giant]] at least 1.5 times the mass of [[Jupiter]], which orbits its host star at a distance of 1.85 [[Astronomical unit|AU]] once every {{convert|847|day|year|abbr=off}}.{{R|luhn19}}
In 2011, [[radial-velocity method|radial-velocity]] observations made at the [[W. M. Keck Observatory]] revealed the existence of one exoplanet around HD 30856 A.{{R|johnson11}} The planet, HD 30856 Ab, is thought to be a [[gas giant]] at least 1.5 times the mass of [[Jupiter]], which orbits its host star at a distance of 1.85 [[AU]] once every {{convert|847|day|year|abbr=off}}.{{R|luhn19}}
{{OrbitboxPlanet begin
{{OrbitboxPlanet begin
| table_ref = {{R|luhn19}}
| table_ref = {{R|luhn19}}
}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = HD 30856 b (Nakanbé)
| exoplanet = HD 30856 Ab (Nakanbé)
| mass = >1.547
| mass = >1.547
| period = 847.468 ± 19.811
| period = 847.468 ± 19.811
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<ref name="ngo17">{{cite journal | last=Ngo | first=Henry | last2=Knutson | first2=Heather A. | last3=Bryan | first3=Marta L. | last4=Blunt | first4=Sarah | last5=Nielsen | first5=Eric L. | last6=Batygin | first6=Konstantin | last7=Bowler | first7=Brendan P. | last8=Crepp | first8=Justin R. | last9=Hinkley | first9=Sasha | last10=Howard | first10=Andrew W. | last11=Mawet | first11=Dimitri | title=No Difference in Orbital Parameters of RV-detected Giant Planets between 0.1 and 5 au in Single versus Multi-stellar Systems | journal=The Astronomical Journal | volume=153 | issue=6 | date=2017-06-01 | issn=0004-6256 | doi=10.3847/1538-3881/aa6cac | doi-access=free | page=242}}</ref>
<ref name="ngo17">{{cite journal | last=Ngo | first=Henry | last2=Knutson | first2=Heather A. | last3=Bryan | first3=Marta L. | last4=Blunt | first4=Sarah | last5=Nielsen | first5=Eric L. | last6=Batygin | first6=Konstantin | last7=Bowler | first7=Brendan P. | last8=Crepp | first8=Justin R. | last9=Hinkley | first9=Sasha | last10=Howard | first10=Andrew W. | last11=Mawet | first11=Dimitri | title=No Difference in Orbital Parameters of RV-detected Giant Planets between 0.1 and 5 au in Single versus Multi-stellar Systems | journal=The Astronomical Journal | volume=153 | issue=6 | date=2017-06-01 | issn=0004-6256 | doi=10.3847/1538-3881/aa6cac | doi-access=free | page=242}}</ref>


<ref name="new_fr">{{Cite web |url=http://www.nameexoworlds.iau.org/final-results |title=Approved names |website=NameExoWorlds |publisher=[[IAU]] |accessdate=2019-12-24 }}</ref>
<ref name="new_fr">{{Cite web |url=https://nameexoworlds.iau.org/_files/ugd/6358ac_5eebee4eba4f41b7a9f6201123673a24.pdf |title=Approved names |website=NameExoWorlds |publisher=[[IAU]] |accessdate=2024-07-30|page=4 }}</ref>

<ref name="Pecaut2013">{{cite journal |last1=Pecaut |first1=Mark J. |last2=Mamajek |first2=Eric E. |title=Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-main-sequence Stars |journal=The Astrophysical Journal Supplement Series |date=1 September 2013 |volume=208 |issue=1 |pages=9 |doi=10.1088/0067-0049/208/1/9 |url=https://ui.adsabs.harvard.edu/abs/2013ApJS..208....9P/abstract |issn=0067-0049|arxiv=1307.2657 |bibcode=2013ApJS..208....9P |s2cid=119308564 }}</ref>

<ref name="Mamajek2021">{{cite web |last1=Mamajek |first1=Eric |title=A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence |url=http://www.pas.rochester.edu/~emamajek/EEM_dwarf_UBVIJHK_colors_Teff.txt |publisher=University of Rochester, Department of Physics and Astronomy |access-date=5 July 2021 |date=2 March 2021}}</ref>

<ref name="Cifuentes2020">{{cite journal |first1=C. |last1=Cifuentes|first2=J.A. |last2=Caballero|first3=M. |last3=Cortés-Contreras|first4=D.|last4=Montes|first5=F.J.|last5=Abellán|first6=R.|last6=Dorda|first7=G.|last7=Holgado|year=2020|title=CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions|journal=Astronomy and Astrophysics |volume=642 |pages=32|issue=October 2020|doi=10.1051/0004-6361/202038295 |bibcode=2020A&A...642A.115C |arxiv=2007.15077}}</ref>
}}
}}


===Footnotes===
===Footnotes===
{{noteslist|notes=
{{noteslist|notes=
{{efn|name=n1|The source publication provides three separate estimates, namely 3940 ± 200 K, 3945 ± 70 K, and 3731 ± 29 K.}}

{{efn|name=n2|According to the listed sources, typical M0V and M1V stars have masses of 0.57 / 0.54 {{Solar mass}} and surface temperatures of 3850 / 3660 K, respectively.}}


}}
}}

Revision as of 05:27, 30 July 2024

HD 30856 / Mouhoun
Location of HD 30856 (circled)
Observation data
Epoch J2000.0[1]      Equinox J2000.0[1]
Constellation Eridanus[2]
Right ascension 04h 50m 17.8614408264s[1]
Declination −24° 22′ 07.833769068″[1]
Apparent magnitude (V) 7.911[1][3]
Characteristics
Evolutionary stage Red-giant branch star[1]
Spectral type K0III[1][3]
B−V color index 0.961[1][3]
Astrometry
Radial velocity (Rv)35.71[1] km/s
Proper motion (μ) RA: 18.469[1] mas/yr
Dec.: −19.837[1] mas/yr
Parallax (π)7.5965 ± 0.0179 mas[1]
Distance429 ± 1 ly
(131.6 ± 0.3 pc)
Orbit[4]
PrimaryHD 30856 A
CompanionHD 30856 B
Semi-major axis (a)0.786″
Details
HD 30856 A
Mass1.17[5] / 1.35[4] M☉
Radius4.40[5] R☉
Luminosity9.9±0.5[6] L☉
Surface gravity (log g)3.20[5] cgs
Temperature4895[5] / 4982 ± 44[4] K
Metallicity [Fe/H]−0.06±0.03[6] dex
Rotational velocity (v sin i)2.85[6] km/s
HD 30856 B
Mass0.54±0.01[4] M☉
Surface gravity (log g)4.7[4] cgs
Temperature3700–4150[4] K
Other designations
CD−24 2616, Gaia DR3 4893980371818915456, HD 30856, HIP 22491, SAO 169805, TIC 612908, TYC 6466-1769-1, GSC 06466-01769, 2MASS J00191704+1403172[1]
Database references
SIMBADdata

HD 30856 (proper name Mouhoun) is a binary system between HD 30856 A (often simply HD 30856[6]Cite error: The <ref> tag has too many names (see the help page).[7][8][a]

Since the star shares a very similar proper motion with HD 30856 A, the two stars are believed to be in a binary system. HD 30856 B revolves around the primary star (A) in a wide orbit, with a semi-major axis of 93 ± 8 AU.[4]

Nomenclature

In 2019, the People's Republic of Burkina Faso was assigned to giving the HD 30856 A system a proper name as part of the IAU100 NameExoWorlds Project,[2] planned to celebrate the hundredth anniversary of the International Astronomical Union (IAU), which grants the right to name an exoplanetary system to every state and territory in the world. Names were submitted and selected within Burkina Faso, which were then presented to the IAU to be officially recognized.[9] On 17 December 2019, the IAU announced that HD 30856 A and its planet, b, were named Mouhoun and Nakanbé, respectively.[10]

Mouhoun is named after the Black Volta (locally called Mouhoun), Burkina Faso's largest river that serves a crucial societal role in the western part of the country. Nakanbé is the native name for the White Volta, the second largest river in the nation with its source located in the Sahel region.[10]

Planetary system

In 2011, radial-velocity observations made at the W. M. Keck Observatory revealed the existence of one exoplanet around HD 30856 A.[6] The planet, HD 30856 Ab, is thought to be a gas giant at least 1.5 times the mass of Jupiter, which orbits its host star at a distance of 1.85 AU once every 847 days (2.32 years).[5]

The HD 30856 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
HD 30856 Ab (Nakanbé) >1.547 MJ 1.85 847.468 ± 19.811 0.061 ± 0.058 — 1.228 RJ

References

  1. ^ a b c d e f g h i j k l "HD 30856". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-07-30.
  2. ^ a b "List of stars and planets". Name ExoWorlds. IAU. Retrieved 2019-09-15.
  3. ^ a b c ESA (1997), The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission, ESA SP Series, vol. 1200, Noordwijk, Netherlands: ESA Publications Division, Bibcode:1997ESASP1200.....E, ISBN 9290923997
  4. ^ a b c d e f g Ngo, Henry; Knutson, Heather A.; Bryan, Marta L.; Blunt, Sarah; Nielsen, Eric L.; Batygin, Konstantin; Bowler, Brendan P.; Crepp, Justin R.; Hinkley, Sasha; Howard, Andrew W.; Mawet, Dimitri (2017-06-01). "No Difference in Orbital Parameters of RV-detected Giant Planets between 0.1 and 5 au in Single versus Multi-stellar Systems". The Astronomical Journal. 153 (6): 242. doi:10.3847/1538-3881/aa6cac. ISSN 0004-6256.
  5. ^ a b c d e f Luhn, Jacob K.; Bastien, Fabienne A.; Wright, Jason T.; Johnson, John A.; Howard, Andrew W.; Isaacson, Howard (2019-04-01). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4): 149. doi:10.3847/1538-3881/aaf5d0. ISSN 0004-6256.
  6. ^ a b c d e Johnson, John Asher; Clanton, Christian; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Crepp, Justin R.; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Wright, Jason T.; Isaacson, Howard (2011-12-01). "RETIRED A STARS AND THEIR COMPANIONS. VII. 18 NEW JOVIAN PLANETS". The Astrophysical Journal Supplement Series. 197 (2): 26. doi:10.1088/0067-0049/197/2/26. ISSN 0067-0049.
  7. ^ Mamajek, Eric (2 March 2021). "A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence". University of Rochester, Department of Physics and Astronomy. Retrieved 5 July 2021.
  8. ^ Cifuentes, C.; Caballero, J.A.; Cortés-Contreras, M.; Montes, D.; Abellán, F.J.; Dorda, R.; Holgado, G. (2020). "CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions". Astronomy and Astrophysics. 642 (October 2020): 32. arXiv:2007.15077. Bibcode:2020A&A...642A.115C. doi:10.1051/0004-6361/202038295.
  9. ^ "Methodology". Name ExoWorlds. IAU. Retrieved 2019-09-15.
  10. ^ a b "Approved names" (PDF). NameExoWorlds. IAU. p. 4. Retrieved 2024-07-30.
Cite error: A list-defined reference named "Pecaut2013" is not used in the content (see the help page).

Footnotes

  1. ^ According to the listed sources, typical M0V and M1V stars have masses of 0.57 / 0.54 M☉ and surface temperatures of 3850 / 3660 K, respectively.
Cite error: A list-defined reference named "n1" is not used in the content (see the help page).

See also

Category:Eridanus (constellation) Category:Planetary systems Category:Stars

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