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HD 118203: Difference between revisions

Coordinates: Sky map 13h 34m 02.5375s, +53° 43′ 42.704″
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Importing Wikidata short description: "Star in the constellation Ursa Major" (Shortdesc helper)
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{{short description|Star in the constellation Ursa Major}}
{{short description|Star in the constellation Ursa Major}}
{{Starbox begin
{{Starbox begin}}
| name = [[Henry Draper catalogue|HD]] 118203
⚫
}}
{{Starbox observe
{{Starbox observe
| epoch = J2000.0
| epoch = J2000.0
| constell = [[Ursa Major]]
| constell = [[Ursa Major]]
| ra = {{RA|13|34|02.5394}}<ref name="Gaia DR2"/>
| ra = {{RA|13|34|02.5394}}<ref name="Gaia DR2"/>
| dec = {{DEC|+53|43|42.6984}}<ref name="Gaia DR2"/>
| dec = {{DEC|+53|43|42.6984}}<ref name="Gaia DR2"/>
| appmag_v = 8.05
| appmag_v = 8.06<ref name=Earle2017/>
}}
}}
{{Starbox character
{{Starbox character
| type =
|class=K0IV
| class = K0IV
| b-v = {{val|0.699|0.012}}<ref name=Anderson_Francis_2012/>
| variable =
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = {{val|−29.07|0.24}}<ref name=Anderson_Francis_2012/>
| radial_v =
| prop_mo_ra = {{val|−85.877|0.052}}<ref name="Gaia DR2"/>
| prop_mo_ra = {{val|−85.877|0.052}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{val|−78.913|0.038}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{val|−78.913|0.038}}<ref name="Gaia DR2"/>
| parallax = 10.8102
| parallax = 10.8102
| p_error = 0.0275
| p_error = 0.0275
| parallax_footnote = <ref name="Gaia DR2"/>
| parallax_footnote = <ref name="Gaia DR2"/>
| absmag_v =
| absmag_v = 3.32<ref name=Earle2017/>
⚫
}}
{{Starbox detail
| source = <ref name=Bonfanti_et_al_2015/>
| mass = {{val|1.23|0.03}}
| radius = {{val|2.00|0.10}}
| luminosity = {{val|3.80|0.30}}
| gravity = {{val|3.93|0.02}}
| temperature = {{val|5741|35|fmt=commas}}
| metal_fe = 0.16<ref name=Earle2017/>
| rotation =
| rotational_velocity = 7.0<ref name=Earle2017/>
| age_gyr = {{val|5.4|0.5}}
}}
}}
{{Starbox catalogue
{{Starbox catalogue
| names = {{odlist | BD=+54°1609 | HIP=66192 | SAO=28802 }},<ref name="Simbad"/> TOI&nbsp;1271
| names = {{odlist | HD=118203 | BD=+54°1609 | HIP=66192 | SAO=28802 }},<ref name="Simbad"/> TOI&nbsp;1271
}}
}}
{{Starbox reference
{{Starbox reference
| Simbad = HD+118203|sn=The star
| Simbad = HD+118203|sn=The star
| Simbad2 = HD+118203b|sn2=planet b
| Simbad2 = HD+118203b|sn2=planet b
| NSTED = HD+118203
| NSTED = HD+118203
}}
}}
{{Starbox end}}
{{Starbox end}}


'''HD 118203''' is a [[orange subgiant|K-type subgiant]] [[star]] located in the [[Ursa Major constellation]] about 302 [[light year]]s away from Earth. It has higher [[metallicity]] by 25% and very similar stellar age of 4.6 billion years. It has mass 23% greater than the Sun. It is invisible to the naked eye but it can be seen using [[binoculars]] or a [[telescope]].
'''HD 118203''' is a [[star]] located in the northern [[circumpolar constellation]] of [[Ursa Major]]. It has the proper name '''Liesma''', which means [[flame]], and it is the name of a character from the Latvian poem ''[[Staburags un Liesma]]'' (Staburags and Liesma). The name was selected in the [[NameExoWorlds]] campaign by [[Latvia]], during the 100th anniversary of the [[International Astronomical Union|IAU]].<ref name=nameexoworlds/><ref name=IAU/>


The [[apparent visual magnitude]] of HD 118203 is 8.06,<ref name=Earle2017/> which means it is invisible to the naked eye but it can be seen using [[binoculars]] or a [[telescope]]. Based on [[stellar parallax|parallax]] measurements, it is located at a distance of 302&nbsp;[[light year]]s from the [[Sun]].<ref name="Gaia DR2"/> The star is drifting closer with a [[radial velocity]] of −29&nbsp;km/s.<ref name=Anderson_Francis_2012/> Based on its position and [[space velocity]] this is most likely (97% chance) an older [[thin disk]] star.<ref name=Pepper_et_al_2020/> An [[exoplanet]] has been detected in a close orbit around the star.<ref name=daSilva_et_al_2006/>
The star HD 118203 is named '''Liesma'''. The name was selected in the [[NameExoWorlds]] campaign by [[Latvia]], during the 100th anniversary of the [[International Astronomical Union|IAU]]. Liesma means [[flame]], and it is the name of a character from the Latvian poem [[Staburags un Liesma]].<ref>{{Cite web|url=http://www.nameexoworlds.iau.org/final-results|title=Approved names|website=NameExoworlds|language=en|access-date=2020-01-02}}</ref><ref>{{Cite web|url=https://www.iau.org/news/pressreleases/detail/iau1912/|title=International Astronomical Union {{!}} IAU|website=www.iau.org|access-date=2020-01-02}}</ref>

The [[stellar spectrum|spectrum]] of this star matches a [[K-type star|K-type]] [[dwarf star|dwarf]] with a [[stellar classification|class]] of K0. Its absolute magnitude of 3.32<ref name=Earle2017/> is too high for a [[K-type main-sequence star]], indicating that it has begun to [[stellar evolution|evolve]] on the [[subdwarf star|subdwarf stage]]. This is confirmed by the [[surface gravity]], which is too low for a typical dwarf star of this class. It has a low level of [[chromospheric activity]], which means a low level of radial velocity jitter for planet detection purposes.<ref name=daSilva_et_al_2006/> The star has 1.23<ref name=Bonfanti_et_al_2015/> times the [[mass of the Sun]] and double the [[Sun's radius]]. It is around 5.4&nbsp;billion years old and is spinning with a [[projected rotational velocity]] of 7.0&nbsp;km/s.<ref name=Earle2017/> HD 118203 is radiating 3.8 times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of 5,741&nbsp;K.<ref name=Bonfanti_et_al_2015/>

In 2006, a [[hot Jupiter]] candidate was reported in an eccentric orbit around this star. It was discovered using the [[radial velocity method]] based on observation of high-[[metallicity]] stars begun in 2004.<ref name=daSilva_et_al_2006/> In 2020, it was found that this is a [[transiting planet]], which allowed the mass and radius of the body to be determined. This exoplanet has more than double the mass of Jupiter and a 13% greater radius. The fact that the parent star is among the brighter known planet hosts (as of 2020) makes it an interesting object for further study.<ref name=Pepper_et_al_2020/>


{{OrbitboxPlanet begin
{{OrbitboxPlanet begin
| table_ref = <ref name=Pepper_et_al_2020/>
| table_ref = <ref>{{Cite journal |last1=Pepper|first1=Joshua|last2=Kane|first2=Stephen R.|last3=Rodriguez|first3=Joseph E.|last4=Hinkel|first4=Natalie R.|last5=Eastman|first5=Jason D.|last6=Daylan|first6=Tansu|last7=Mocnik|first7=Teo|last8=Dalba|first8=Paul A.|last9=Fetherolf|first9=Tara|last10=Stassun|first10=Keivan G.|last11=Campante|first11=Tiago L.|title=TESS Reveals HD 118203 b to be a Transiting Planet|journal=The Astronomical Journal|year=2020|volume=159|issue=6|page=243|doi=10.3847/1538-3881/ab84f2|arxiv=1911.05150|s2cid=207930540}}</ref>
}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = [[HD 118203 b|b]]
| exoplanet = [[HD 118203 b|b]]
| mass = {{val|2.173|0.077|0.080}}
| mass = {{val|2.173|0.077|0.080}}
| period = {{val|6.134980|0.000038|0.000037}}
| period = {{val|6.134980|0.000038|0.000037}}
| semimajor = {{val|0.07082|0.00095|0.0011}}
| semimajor = {{val|0.07082|0.00095|0.0011}}
| eccentricity = 0.316 ± 0.021
| eccentricity = {{val|0.316|0.021}}
| radius = {{val|1.133|0.031|0.030}}
| radius = {{val|1.133|0.031|0.030}}
| inclination = {{val|88.75|0.86|1.0}}
| inclination = {{val|88.75|0.86|1.0}}
}}
}}
{{Orbitbox end}}
{{Orbitbox end}}
Line 60: Line 77:


<ref name="Simbad">{{cite simbad | title=HD 118203 | access-date=2019-10-13 }}</ref>
<ref name="Simbad">{{cite simbad | title=HD 118203 | access-date=2019-10-13 }}</ref>

<ref name=nameexoworlds>{{Cite web
| url=http://www.nameexoworlds.iau.org/final-results
| title=Approved names | website=NameExoworlds
| language=en | access-date=2020-01-02 }}</ref>

<ref name=IAU>{{Cite web
| title=International Astronomical Union {{!}} IAU
| url=https://www.iau.org/news/pressreleases/detail/iau1912/
| website=www.iau.org | access-date=2020-01-02 }}</ref>

<ref name=Anderson_Francis_2012>{{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 }}</ref>

<ref name=Pepper_et_al_2020>{{Cite journal
| display-authors=1 | last1=Pepper | first1=Joshua
| last2=Kane | first2=Stephen R. | last3=Rodriguez | first3=Joseph E.
| last4=Hinkel | first4=Natalie R. | last5=Eastman | first5=Jason D.
| last6=Daylan | first6=Tansu | last7=Mocnik | first7=Teo
| last8=Dalba | first8=Paul A. | last9=Fetherolf | first9=Tara
| last10=Stassun | first10=Keivan G. | last11=Campante | first11=Tiago L.
| title=TESS Reveals HD 118203 b to be a Transiting Planet
| journal=The Astronomical Journal
| year=2020 | volume=159 | issue=6 | page=243
| doi=10.3847/1538-3881/ab84f2 | arxiv=1911.05150
| bibcode=2020AJ....159..243P | s2cid=207930540 }}</ref>

<ref name=Earle2017>{{cite journal
| title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants
| last1=Luck | first1=R. Earle
| journal=The Astronomical Journal
| volume=153 | issue=1 | id=21 | pages=19 | date=January 2017
| bibcode=2017AJ....153...21L | arxiv=1611.02897
| doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 }}</ref>

<ref name=Bonfanti_et_al_2015>{{cite journal
| title=Age consistency between exoplanet hosts and field stars
| display-authors=1 | last1=Bonfanti | first1=A.
| last2=Ortolani | first2=S. | last3=Nascimbeni | first3=V.
| journal=Astronomy & Astrophysics
| volume=585 | pages=A5 | year=2015
| doi=10.1051/0004-6361/201527297 | s2cid=53971692
| bibcode=2016A&A...585A...5B | arxiv=1511.01744 }}</ref>

<ref name=daSilva_et_al_2006>{{cite journal
| title=Elodie metallicity-biased search for transiting Hot Jupiters I. Two Hot Jupiters orbiting the slightly evolved stars HD118203 and HD149143
| last1=da Silva | first1=R. | last2=Udry | first2=S.
| last3=Bouchy | first3=F. | last4=Mayor | first4=M.
| last5=Moutou | first5=C. | last6=Pont | first6=F.
| last7=Queloz | first7=D. | last8=Santos | first8=N. C.
| last9=Ségransan | first9=D. | last10=Zucker | first10=S.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=446 | issue=2 | pages=717–722 | year=2006
| arxiv=astro-ph/0510048 | bibcode=2006A&A...446..717D
| doi=10.1051/0004-6361:20054116 }}</ref>


}}
}}


{{Sky|13|34|02.5375|+|53|43|42.704|289}}
{{Sky|13|34|02.5375|+|53|43|42.704|289}}

{{Stars of Ursa Major}}
{{Stars of Ursa Major}}


[[Category:K-type subgiants]]
[[Category:K-type subgiants]]
⚫
[[Category:Henry Draper Catalogue objects|118203]]
⚫
[[Category:Hipparcos objects|066192]]
⚫
[[Category:Ursa Major (constellation)]]
[[Category:Planetary systems with one confirmed planet]]
[[Category:Planetary systems with one confirmed planet]]
⚫
[[Category:Ursa Major (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Durchmusterung objects]]
⚫
[[Category:Henry Draper Catalogue objects|118203]]
⚫
[[Category:Hipparcos objects|066192]]
[[Category:TESS Objects of Interest|1271]]
[[Category:TESS Objects of Interest|1271]]

Revision as of 16:51, 18 December 2020

HD 118203
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 13h 34m 02.5394s[1]
Declination +53° 43′ 42.6984″[1]
Apparent magnitude (V) 8.06[2]
Characteristics
Spectral type K0IV
B−V color index 0.699±0.012[3]
Astrometry
Radial velocity (Rv)−29.07±0.24[3] km/s
Proper motion (μ) RA: −85.877±0.052[1] mas/yr
Dec.: −78.913±0.038[1] mas/yr
Parallax (π)10.8102 ± 0.0275 mas[1]
Distance301.7 ± 0.8 ly
(92.5 ± 0.2 pc)
Absolute magnitude (MV)3.32[2]
Details[4]
Mass1.23±0.03 M☉
Radius2.00±0.10 R☉
Luminosity3.80±0.30 L☉
Surface gravity (log g)3.93±0.02 cgs
Temperature5,741±35 K
Metallicity [Fe/H]0.16[2] dex
Rotational velocity (v sin i)7.0[2] km/s
Age5.4±0.5 Gyr
Other designations
BD+54°1609, HD 118203, HIP 66192, SAO 28802,[5] TOI 1271
Database references
SIMBADThe star
planet b
Exoplanet Archivedata

HD 118203 is a star located in the northern circumpolar constellation of Ursa Major. It has the proper name Liesma, which means flame, and it is the name of a character from the Latvian poem Staburags un Liesma (Staburags and Liesma). The name was selected in the NameExoWorlds campaign by Latvia, during the 100th anniversary of the IAU.[6][7]

The apparent visual magnitude of HD 118203 is 8.06,[2] which means it is invisible to the naked eye but it can be seen using binoculars or a telescope. Based on parallax measurements, it is located at a distance of 302 light years from the Sun.[1] The star is drifting closer with a radial velocity of −29 km/s.[3] Based on its position and space velocity this is most likely (97% chance) an older thin disk star.[8] An exoplanet has been detected in a close orbit around the star.[9]

The spectrum of this star matches a K-type dwarf with a class of K0. Its absolute magnitude of 3.32[2] is too high for a K-type main-sequence star, indicating that it has begun to evolve on the subdwarf stage. This is confirmed by the surface gravity, which is too low for a typical dwarf star of this class. It has a low level of chromospheric activity, which means a low level of radial velocity jitter for planet detection purposes.[9] The star has 1.23[4] times the mass of the Sun and double the Sun's radius. It is around 5.4 billion years old and is spinning with a projected rotational velocity of 7.0 km/s.[2] HD 118203 is radiating 3.8 times the luminosity of the Sun from its photosphere at an effective temperature of 5,741 K.[4]

In 2006, a hot Jupiter candidate was reported in an eccentric orbit around this star. It was discovered using the radial velocity method based on observation of high-metallicity stars begun in 2004.[9] In 2020, it was found that this is a transiting planet, which allowed the mass and radius of the body to be determined. This exoplanet has more than double the mass of Jupiter and a 13% greater radius. The fact that the parent star is among the brighter known planet hosts (as of 2020) makes it an interesting object for further study.[8]

The HD 118203 planetary system[8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 2.173+0.077
−0.080 MJ 		0.07082+0.00095
−0.0011 		6.134980+0.000038
−0.000037 		0.316±0.021 88.75+0.86
−1.0° 		1.133+0.031
−0.030 RJ

See also

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  3. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  4. ^ a b c Bonfanti, A.; et al. (2015). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: A5. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692.
  5. ^ "HD 118203". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-13.
  6. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  7. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  8. ^ a b c Pepper, Joshua; et al. (2020). "TESS Reveals HD 118203 b to be a Transiting Planet". The Astronomical Journal. 159 (6): 243. arXiv:1911.05150. Bibcode:2020AJ....159..243P. doi:10.3847/1538-3881/ab84f2. S2CID 207930540.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  9. ^ a b c da Silva, R.; et al. (2006). "Elodie metallicity-biased search for transiting Hot Jupiters I. Two Hot Jupiters orbiting the slightly evolved stars HD118203 and HD149143". Astronomy and Astrophysics. 446 (2): 717–722. arXiv:astro-ph/0510048. Bibcode:2006A&A...446..717D. doi:10.1051/0004-6361:20054116.


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