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Coordinates: Sky map 17h 11m 15.7219s, −56° 40′ 50.865″
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{{Short description|Star in the constellation of Ara}}
{{Starbox begin
{{Starbox begin}}
| name = [[Henry Draper catalogue|HD]] 154857 }}
{{Starbox observe
{{Starbox observe
| epoch = J2000
| epoch = J2000
| constell = [[Ara (constellation)|Ara]]
| ra = {{RA|17|11|15.72}}<ref name="van Leeuwen2007"/>
| dec = {{DEC|-56|40|50.9}}<ref name="van Leeuwen2007"/>
| ra = {{RA|17|11|15.72180}}<ref name=GaiaDR2/>
| dec = {{DEC|−56|40|50.8706}}<ref name=GaiaDR2/>
| appmag_v = 7.25
| appmag_v = 7.25<ref name=Anderson_Francis_2012/>
| constell = [[Ara (constellation)|Ara]]
}}
}}
{{Starbox character
{{Starbox character
| class = G5IV-V<ref name="McCarthy2004"/>
| type =
| class = G5IV-V<ref name="McCarthy2004"/>
| b-v = {{val|0.699|0.001}}<ref name=Anderson_Francis_2012/>
| r-i =
| v-r =
| u-b =
| variable = Constant<ref name=Bonfanti_et_al_2016/>
| b-v = 0.699 ± 0.001
| u-b =
| variable=
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = 27.9 ± 0.2
| radial_v = {{val|+28.06|0.15}}<ref name=GaiaDR2/>
| prop_mo_ra = 87.14 ± 0.56<ref name="van Leeuwen2007"/>
| prop_mo_ra = 87.585<ref name=GaiaDR2/>
| prop_mo_dec = -55.92 ± 0.46<ref name="van Leeuwen2007"/>
| prop_mo_dec = −55.891<ref name=GaiaDR2/>
| parallax = 15.57
| parallax = 15.7321
| p_error = 0.71
| p_error = 0.0385
| parallax_footnote = <ref name="van Leeuwen2007"/>
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = 3.07<ref name="McCarthy2004"/>
| absmag_v = 3.07<ref name="McCarthy2004"/>
}}
{{Starbox detail
| mass = {{val|1.718|0.03|0.022}}<ref name="Wittenmyer"/>
| radius = {{val|2.1|0.1}}<ref name=Bonfanti_et_al_2016/>
| luminosity = {{val|4.4|0.3}}<ref name=Bonfanti_et_al_2016/>
| temperature = {{val|5740|46|fmt=commas}}<ref name=Bonfanti_et_al_2016/>
| metal_fe = {{val|−0.26|0.01}}<ref name=Sousa_et_al_2018/>
| rotational_velocity = {{val|1.44|0.50}}<ref name=Butler_et_al_2006/>
| gravity = {{val|3.83|0.03}}<ref name=Bonfanti_et_al_2016/>
| age_gyr = {{val|5.8|0.5}}<ref name=Bonfanti_et_al_2016/>
}}
{{Starbox catalog
| names = {{odlist | CD=−56° 6717 | CPC=20 5475 | CPD=−56° 8059 | GC=23146 | GSC=08735-01682 | HD=154857 | HIP=84069 | PPM=345752 | SAO=244491 | TYC=8735-1682-1 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = HD+154857
| ARICNS =
}}
}}
{{Starbox detail|
mass=1.17 (± 0.05) |
radius=2.42 |
luminosity=4.61 |
temperature=5445 |
metal=-0.23 (± 0.03) % |
rotation= |
gravity=5,579844548 [[g-force|g]] |
age=8.98 G }}
|- bgcolor="#FFFAFA"
| '''Equatorial [''' [[g-force|g]] ''']''' || 54,7 [[Metre per second squared|m/s<sup>2</sup>]]

{{Starbox catalog |
names=[[Boss General Catalogue|GC]] 23146, [[PPM Star Catalogue|PPM]] 345752, [[Tycho Catalogue|TYC]] 8735-1682-1, [[Durchmusterung|CD]]-56° 6717, [[Guide Star Catalog|GSC]] 08735-01682, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 244491, [[uvby98]] 100154857, [[Cape Photographic Catalogue|CPC]] 20 5475, [[Durchmusterung|CPD]]-56° 8059, [[Hipparcos Catalogue|HIP]] 84069, [[SPOCS]] 742. }}
{{Starbox reference |
Simbad=HD+154857
| ARICNS = }}
{{starbox sources|HIP|CCDM|HR}}
{{Starbox end}}
{{Starbox end}}


'''HD 154857''' is a [[star]] with two [[exoplanet]]ary companions in the southern [[constellation]] of [[Ara (constellation)|Ara]]. It is too dim to be visible with the naked eye having an [[apparent visual magnitude]] of 7.25.<ref name=Anderson_Francis_2012/> The star is located at a distance of 207&nbsp;[[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]] measurements, and is drifting further away with a [[radial velocity]] of +28&nbsp;km/s.<ref name=GaiaDR2/>
'''HD 154857''' is a [[yellow dwarf|yellow main-sequence]] [[star]] approximately 209 [[light year]]s<ref name="van Leeuwen2007"/> away in the [[constellation]] of [[Ara (constellation)|Ara]].

This is a [[G-type star]] with a [[stellar classification]] of G5IV-V.<ref name="McCarthy2004"/> The [[absolute magnitude]] of this star is two magnitudes above the [[main sequence]], which suggests that the star is [[stellar evolution|evolving]] toward the [[subgiant star|subgiant]] stage.<ref name="McCarthy2004"/> It is a [[metallicity|metal-poor]] [[thin disk]] star<ref name=Gonzalez2009/> approximately six&nbsp;billion years old and is [[magnetic activity|chromopherically quiet]] although not in a [[Maunder Minimum]] state.<ref name=Bonfanti_et_al_2016/> The star is larger, more massive, and more luminous than the Sun. It is spinning with a [[projected rotational velocity]] of 1.4&nbsp;km/s.<ref name=Butler_et_al_2006/>


==Planetary system==
==Planetary system==


There is one confirmed and one unconfirmed [[exoplanet|planet]] discovered in 2004<ref name="McCarthy2004"/> and 2007<ref name="O'Toole2007"/> respectively. The confirmed planet [[HD 154857 b]] has [[mass]] >1.8 times that of [[Jupiter]]. It orbits the star 20% further than [[Earth]]-[[Sun]] distance, taking 409 days with 47% [[Orbital eccentricity|eccentricity]]. The previously reported additional object ([[HD 154857 c]]) was confirmed to have planetary nature in January of 2014.<ref name="Wittenmyer">[http://arxiv.org/abs/1401.5525 The Anglo-Australian Planet Search. XXIII. Two New Jupiter Analogs]: Robert A. Wittenmyer, Jonathan Horner, C.G. Tinney, R.P. Butler, H.R.A. Jones, Mikko Tuomi, G.S. Salter, B.D. Carter, F. Elliott Koch, S.J. O'Toole, J. Bailey, D. Wright</ref>
The discovery of one confirmed and one unconfirmed Jovian [[exoplanet]] was reported in 2004<ref name="McCarthy2004"/> and 2007<ref name="O'Toole2007"/> respectively. The former planet [[HD 154857 b]] has [[mass]] >1.8 times that of [[Jupiter]]. It orbits the star 20% further than [[Earth]]-[[Sun]] distance, taking 409 days with 47% [[Orbital eccentricity|eccentricity]]. The additional object ([[HD 154857 c]]) was confirmed as a planetary companion in January 2014.<ref name="Wittenmyer"/>


{{OrbitboxPlanet begin
{{OrbitboxPlanet begin
| table_ref = <ref name="O'Toole2007"/><ref name="Wittenmyer" />
| table_ref = <ref name="Wittenmyer" />
}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = [[HD 154857 b|b]]
| exoplanet = [[HD 154857 b|b]]
| mass = >2.24±0.05
| mass = {{val|2.24|0.05|p=≥&nbsp;}}
| period = 408 ± 0.5
| period = {{val|408.6|0.5}}
| semimajor = 1.291±0.008
| semimajor = {{val|1.291|0.008}}
| eccentricity = 0.46 ± 0.02
| eccentricity = {{val|0.06|0.05}}
}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = [[HD 154857 c|c]]
| exoplanet = [[HD 154857 c|c]]
| mass = ≥2.6
| mass = {{val|2.58|0.16|p=≥&nbsp;}}
| period = ~3470
| period = {{val|3452|105|fmt=commas}}
| semimajor = 5.36
| semimajor = {{val|5.36|0.09}}
| eccentricity = 0.06
| eccentricity = {{val|0.06|0.05}}
}}
}}
{{Orbitbox end}}
{{Orbitbox end}}
Line 77: Line 77:
{{Reflist|colwidth=30em|refs=
{{Reflist|colwidth=30em|refs=


<ref name=SIMBAD>{{cite simbad
<ref name="McCarthy2004">{{cite journal | url=http://iopscience.iop.org/0004-637X/617/1/575/fulltext/ | title=Multiple Companions to HD 154857 and HD 160691 | last1=McCarthy | first1=Chris | last2=Butler | first2=R. Paul | last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A. | last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad | last7=Penny | first7=Alan J. | last8=Fischer | first8=Debra A. | display-authors=1 | journal=The Astrophysical Journal | volume=617 | issue=1 | pages=575–579 | year=2004 | arxiv=astro-ph/0409335 | bibcode=2004ApJ...617..575M | doi=10.1086/425214 }}</ref>
| title=HD 154857 | access-date=2021-10-10 }}</ref>


<ref name=GaiaDR2>{{Cite Gaia DR2|5917212800626605824}}</ref>
<ref name="O'Toole2007">{{cite journal | url=http://www.iop.org/EJ/article/0004-637X/660/2/1636/70956.html | title=New Planets around Three G Dwarfs | last1=O'Toole | first1=Simon J. | last2=Butler | first2=R. Paul | last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A. | last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad | last7=McCarthy | first7=Chris | last8=Bailey | first8=Jeremy | last9=Penny | first9=Alan J. | display-authors=1 | journal=The Astrophysical Journal | volume=660 | issue=2 | pages=1636–1641 | year=2007 | arxiv=astro-ph/0702213 | bibcode=2007ApJ...660.1636O | doi=10.1086/513563 }}</ref>


<ref name=Anderson_Francis_2012>{{cite journal
<ref name="van Leeuwen2007">{{cite journal | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=83792 Vizier catalog entry ]</ref>
| 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="McCarthy2004">{{cite journal
| title=Multiple Companions to HD 154857 and HD 160691
| last1=McCarthy | first1=Chris | last2=Butler | first2=R. Paul
| last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A.
| last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad
| last7=Penny | first7=Alan J. | last8=Fischer | first8=Debra A.
| display-authors=1 | journal=The Astrophysical Journal
| volume=617 | issue=1 | pages=575–579 | date=2004
| arxiv=astro-ph/0409335 | bibcode=2004ApJ...617..575M
| doi=10.1086/425214 | s2cid=119446133 }}</ref>

<ref name="O'Toole2007">{{cite journal
| title=New Planets around Three G Dwarfs
| last1=O'Toole | first1=Simon J. | last2=Butler | first2=R. Paul
| last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A.
| last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad
| last7=McCarthy | first7=Chris | last8=Bailey | first8=Jeremy
| last9=Penny | first9=Alan J. | display-authors=1
| journal=The Astrophysical Journal
| volume=660 | issue=2 | pages=1636–1641 | date=2007
| arxiv=astro-ph/0702213 | bibcode=2007ApJ...660.1636O
| doi=10.1086/513563 | s2cid=118958847 }}</ref>

<ref name="Wittenmyer">{{cite journal
| title=The Anglo-Australian Planet Search. XXIII. Two New Jupiter Analogs
| first1=Robert A. | last1=Wittenmyer | first2=Jonathan | last2=Horner
| first3=C. G. | last3=Tinney | first4=R. P. | last4=Butler
| first5=H. R. A. | last5=Jones | first6=Mikko | last6=Tuomi
| first7=G. S. | last7=Salter | first8=B. D. | last8=Carter
| first9=F. Elliott | last9=Koch | first10=S. J. | last10=O'Toole
| first11=J. | last11=Bailey | first12=D. | last12=Wright
| display-authors=1 | journal=The Astrophysical Journal
| volume=783 | issue=2 | id=103 | pages=9 | date=March 2014
| doi=10.1088/0004-637X/783/2/103 | arxiv=1401.5525
| bibcode=2014ApJ...783..103W | s2cid=14082923 }}</ref>

<ref name=Sousa_et_al_2018>{{cite journal
| title=SWEET-Cat updated. New homogenous spectroscopic parameters
| display-authors=1 | last1=Sousa | first1=S. G.
| last2=Adibekyan | first2=V. | last3=Delgado-Mena | first3=E.
| last4=Santos | first4=N. C. | last5=Andreasen | first5=D. T.
| last6=Ferreira | first6=A. C. S. | last7=Tsantaki | first7=M.
| last8=Barros | first8=S. C. C. | last9=Demangeon | first9=O.
| last10=Israelian | first10=G. | last11=Faria | first11=J. P.
| last12=Figueira | first12=P. | last13=Mortier | first13=A.
| last14=Brandão | first14=I. | last15=Montalto | first15=M.
| last16=Rojas-Ayala | first16=B. | last17=Santerne | first17=A.
| journal=Astronomy & Astrophysics
| volume=620 | id=A58 | pages=13 | date=November 2018
| doi=10.1051/0004-6361/201833350 | arxiv=1810.08108
| bibcode=2018A&A...620A..58S | s2cid=119374557 }}</ref>

<ref name=Bonfanti_et_al_2016>{{cite journal
| title=Age consistency between exoplanet hosts and field stars
| last1=Bonfanti | first1=A.
| last2=Ortolani | first2=S. | last3=Nascimbeni | first3=V.
| journal=Astronomy & Astrophysics
| year=2016 | volume=585 | id=A5 | pages=14
| arxiv=1511.01744 | bibcode=2016A&A...585A...5B
| doi=10.1051/0004-6361/201527297 | s2cid=53971692 }}</ref>

<ref name=Butler_et_al_2006>{{cite journal
| 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. | display-authors=1
| title=Catalog of Nearby Exoplanets
| journal=The Astrophysical Journal
| volume=646 | issue=1 | pages=505–522 | date=December 2006
| doi=10.1086/504701 | arxiv=astro-ph/0607493
| bibcode=2006ApJ...646..505B | s2cid=119067572 }}</ref>

<ref name=Gonzalez2009>{{cite journal
| title=Stars with planets and the thick disc
| last=Gonzalez | first=Guillermo
| journal=Monthly Notices of the Royal Astronomical Society: Letters
| volume=399 | issue=1 | pages=L103–L107 | date=October 2009
| doi=10.1111/j.1745-3933.2009.00734.x | bibcode=2009MNRAS.399L.103G | doi-access=free }}</ref>


}}
}}


==External links==
==External links==
* {{cite web|url=http://exoplanet.eu/star.php?st=HD+154857|title=HD 154857|work=The Extrasolar Planets Encyclopaedia|accessdate=2008-07-21}}
* {{cite encyclopedia|url=http://exoplanet.eu/star.php?st=HD+154857|archive-url=https://web.archive.org/web/20070702190615/http://exoplanet.eu/star.php?st=HD+154857|url-status=dead|archive-date=July 2, 2007|encyclopedia=[[Extrasolar Planets Encyclopaedia]]|title=HD 154857|access-date=2008-07-21}}
* [http://planetquest.jpl.nasa.gov/atlas/atlas_profile.cfm?Planet=261 http://planetquest.jpl.nasa.gov]
* [https://web.archive.org/web/20080916061358/http://planetquest.jpl.nasa.gov/atlas/atlas_profile.cfm?Planet=261 http://planetquest.jpl.nasa.gov]


{{Sky|17|11|15.7219|-|56|40|50.865|223.55}}
{{Sky|17|11|15.7219|-|56|40|50.865|223.55}}

{{Stars of Ara}}
{{Stars of Ara}}


{{DEFAULTSORT:HD 154857}}
<!-- Properties -->
[[Category:G-type subgiants]]
[[Category:Planetary systems with two confirmed planets]]
<!-- Other -->
[[Category:Ara (constellation)]]
[[Category:Ara (constellation)]]
[[Category:G-type main-sequence stars]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|154857]]
[[Category:Henry Draper Catalogue objects|154857]]
[[Category:Hipparcos objects|84069]]
[[Category:Hipparcos objects|084069]]
[[Category:Planetary systems]]


{{star-stub}}
{{main-star-stub}}

Latest revision as of 06:22, 22 December 2023

HD 154857
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 11m 15.72180s[1]
Declination −56° 40′ 50.8706″[1]
Apparent magnitude (V) 7.25[2]
Characteristics
Spectral type G5IV-V[3]
B−V color index 0.699±0.001[2]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)+28.06±0.15[1] km/s
Proper motion (μ) RA: 87.585[1] mas/yr
Dec.: −55.891[1] mas/yr
Parallax (π)15.7321 ± 0.0385 mas[1]
Distance207.3 ± 0.5 ly
(63.6 ± 0.2 pc)
Absolute magnitude (MV)3.07[3]
Details
Mass1.718+0.03
−0.022[5] M☉
Radius2.1±0.1[4] R☉
Luminosity4.4±0.3[4] L☉
Surface gravity (log g)3.83±0.03[4] cgs
Temperature5,740±46[4] K
Metallicity [Fe/H]−0.26±0.01[6] dex
Rotational velocity (v sin i)1.44±0.50[7] km/s
Age5.8±0.5[4] Gyr
Other designations
CD−56° 6717, CPD−56° 8059, GC 23146, HD 154857, HIP 84069, SAO 244491, PPM 345752, TYC 8735-1682-1, GSC 08735-01682[8]
Database references
SIMBADdata

HD 154857 is a star with two exoplanetary companions in the southern constellation of Ara. It is too dim to be visible with the naked eye having an apparent visual magnitude of 7.25.[2] The star is located at a distance of 207 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +28 km/s.[1]

This is a G-type star with a stellar classification of G5IV-V.[3] The absolute magnitude of this star is two magnitudes above the main sequence, which suggests that the star is evolving toward the subgiant stage.[3] It is a metal-poor thin disk star[9] approximately six billion years old and is chromopherically quiet although not in a Maunder Minimum state.[4] The star is larger, more massive, and more luminous than the Sun. It is spinning with a projected rotational velocity of 1.4 km/s.[7]

Planetary system

[edit]

The discovery of one confirmed and one unconfirmed Jovian exoplanet was reported in 2004[3] and 2007[10] respectively. The former planet HD 154857 b has mass >1.8 times that of Jupiter. It orbits the star 20% further than Earth-Sun distance, taking 409 days with 47% eccentricity. The additional object (HD 154857 c) was confirmed as a planetary companion in January 2014.[5]

The HD 154857 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 2.24±0.05 MJ 1.291±0.008 408.6±0.5 0.06±0.05 — —
c ≥ 2.58±0.16 MJ 5.36±0.09 3,452±105 0.06±0.05 — —

See also

[edit]

References

[edit]
  1. ^ a b c d e f g 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 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.
  3. ^ a b c d e McCarthy, Chris; et al. (2004). "Multiple Companions to HD 154857 and HD 160691". The Astrophysical Journal. 617 (1): 575–579. arXiv:astro-ph/0409335. Bibcode:2004ApJ...617..575M. doi:10.1086/425214. S2CID 119446133.
  4. ^ a b c d e f g Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
  5. ^ a b c Wittenmyer, Robert A.; et al. (March 2014). "The Anglo-Australian Planet Search. XXIII. Two New Jupiter Analogs". The Astrophysical Journal. 783 (2): 9. arXiv:1401.5525. Bibcode:2014ApJ...783..103W. doi:10.1088/0004-637X/783/2/103. S2CID 14082923. 103.
  6. ^ Sousa, S. G.; et al. (November 2018). "SWEET-Cat updated. New homogenous spectroscopic parameters". Astronomy & Astrophysics. 620: 13. arXiv:1810.08108. Bibcode:2018A&A...620A..58S. doi:10.1051/0004-6361/201833350. S2CID 119374557. A58.
  7. ^ a b Butler, R. P.; et al. (December 2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.
  8. ^ "HD 154857". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-10.
  9. ^ Gonzalez, Guillermo (October 2009). "Stars with planets and the thick disc". Monthly Notices of the Royal Astronomical Society: Letters. 399 (1): L103 – L107. Bibcode:2009MNRAS.399L.103G. doi:10.1111/j.1745-3933.2009.00734.x.
  10. ^ O'Toole, Simon J.; et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal. 660 (2): 1636–1641. arXiv:astro-ph/0702213. Bibcode:2007ApJ...660.1636O. doi:10.1086/513563. S2CID 118958847.
[edit]


Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=HD_154857&oldid=1191219422"