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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=17<sup>h</sup> 11<sup>m</sup> 15.7219<sup>s</sup> |
| ra = {{RA|17|11|15.72180}}<ref name=GaiaDR2/>
dec= -56° 40&prime; 50.865&Prime; |
| 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=G5V |
r-i = |
| type =
| class = G5IV-V<ref name="McCarthy2004"/>
v-r = |
b-v = 0.699 ± 0.001 |
| b-v = {{val|0.699|0.001}}<ref name=Anderson_Francis_2012/>
u-b = |
| u-b =
| variable = Constant<ref name=Bonfanti_et_al_2016/>
variable= }}
}}
{{Starbox astrometry |
{{Starbox astrometry
radial_v=27.9 ± 0.2 |
| radial_v = {{val|+28.06|0.15}}<ref name=GaiaDR2/>
prop_mo_ra=87.19 ± 0.8 |
| prop_mo_ra = 87.585<ref name=GaiaDR2/>
prop_mo_dec=-55.37 ± 0.57 |
| prop_mo_dec = −55.891<ref name=GaiaDR2/>
parallax=14.59 |
| parallax = 15.7321
p_error=0.91 |
| p_error = 0.0385
absmag_v=7.9 }}
| parallax_footnote = <ref name=GaiaDR2/>
{{Starbox detail|
| absmag_v = 3.07<ref name="McCarthy2004"/>
mass=1.17 (± 0.05) |
}}
radius=2.42 |
{{Starbox detail
luminosity=4.61 |
| mass = {{val|1.718|0.03|0.022}}<ref name="Wittenmyer"/>
temperature=5445 |
| radius = {{val|2.1|0.1}}<ref name=Bonfanti_et_al_2016/>
metal=-0.23 (± 0.03) % |
| luminosity = {{val|4.4|0.3}}<ref name=Bonfanti_et_al_2016/>
rotation= |
| temperature = {{val|5740|46|fmt=commas}}<ref name=Bonfanti_et_al_2016/>
gravity=5,579844548 [[g-force|g]] |
| metal_fe = {{val|−0.26|0.01}}<ref name=Sousa_et_al_2018/>
age=8.98 G }}
| rotational_velocity = {{val|1.44|0.50}}<ref name=Butler_et_al_2006/>
|- bgcolor="#FFFAFA"
| gravity = {{val|3.83|0.03}}<ref name=Bonfanti_et_al_2016/>
| '''Equatorial [''' [[g-force|g]] ''']''' || 54,7 [[Metre per second squared|m/s<sup>2</sup>]]
| age_gyr = {{val|5.8|0.5}}<ref name=Bonfanti_et_al_2016/>

}}
{{Starbox catalog |
{{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, [[Hipparcos Input Catalogue|HIC]] 84069, [[Durchmusterung|CPD]]-56° 8059, [[Hipparcos Catalogue|HIP]] 84069, [[SPOCS]] 742. }}
| 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
{{Starbox reference
| ARICNS = }}
| Simbad = HD+154857
{{starbox sources|HIP|CCDM|HR}}
| ARICNS =
}}
{{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 224 [[light year]]s 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 and 2007<ref name="O'Toole"/> 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 unconfirmed planet HD 154857 c with unknown mass (probably around 18 Jupiter masses) takes at least 1900 days to orbit around the star with an orbital eccentricity exceeding 0.25.
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="Wittenmyer" />
| table_ref = <ref name="O'Toole"> {{cite journal | url=http://www.iop.org/EJ/article/0004-637X/660/2/1636/70956.html | author=O'Toole ''et al.'' | title=New Planets around Three G Dwarfs | journal=The [[Astrophysical Journal]] | volume=660 | issue=2 | year=2007 | pages=1636–1641 | doi=10.1086/513563 | 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. }}</ref>}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = [[HD 154857 b|b]]
| exoplanet = [[HD 154857 b|b]]
| mass = >1.8 ± 0.4
| mass = {{val|2.24|0.05|p=≥&nbsp;}}
| period = 409 ± 1
| period = {{val|408.6|0.5}}
| semimajor = 1.2 ± 0.2
| semimajor = {{val|1.291|0.008}}
| eccentricity = 0.47 ± 0.02
| eccentricity = {{val|0.06|0.05}}
}}
}}
{{OrbitboxPlanet hypothetical
{{OrbitboxPlanet
| exoplanet = [[HD 154857 c|c]]
| exoplanet = [[HD 154857 c|c]]
| mass = ≥18.4
| mass = {{val|2.58|0.16|p=≥&nbsp;}}
| period = >1900
| period = {{val|3452|105|fmt=commas}}
| semimajor = ?
| semimajor = {{val|5.36|0.09}}
| eccentricity = ≥0.25
| eccentricity = {{val|0.06|0.05}}
}}
}}
{{Orbitbox end}}
{{Orbitbox end}}
Line 70: Line 75:


==References==
==References==
{{Reflist}}
{{Reflist|colwidth=30em|refs=
* {{cite journal |bibcode=2004ApJ...617..575M |author=McCarthy, Chris; Butler, R. Paul; Tinney, C. G.; Jones, Hugh R. A.; Marcy, Geoffrey W.; Carter, Brad; Penny, Alan J.; Fischer, Debra A. |title=Multiple Companions to HD 154857 and HD 160691 |work=Astronomy Abstract Service |year=2004 |volume=617 |issue=1 |pages=575–579 |doi=10.1086/425214 |journal=The Astrophysical Journal }}


<ref name=SIMBAD>{{cite simbad
* [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIP%2084069 HIP 84069] - Catalog
| title=HD 154857 | access-date=2021-10-10 }}</ref>
* [http://aladin.u-strasbg.fr/AladinPreview?-c=17+11+15.7219-56+40+50.865&ident=HD+154857&submit=Aladin+previewer Image HD 154857]


<ref name=GaiaDR2>{{Cite Gaia DR2|5917212800626605824}}</ref>
==External links==


<ref name=Anderson_Francis_2012>{{cite journal
* {{cite web|url=http://exoplanet.eu/star.php?st=HD+154857|title=HD 154857|work=The Extrasolar Planets Encyclopaedia|accessdate=2008-07-21}}
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
* {{cite web |url=http://www.extrasolar.net/planettour.asp?StarCatId=normal&StarId=226 |title=HD 154857 |work=Extrasolar Visions|accessdate=2008-07-21}}
| title=XHIP: An extended hipparcos compilation
* [http://planetquest.jpl.nasa.gov/atlas/atlas_profile.cfm?Planet=261 http://planetquest.jpl.nasa.gov]
| 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==
* {{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}}
* [https://web.archive.org/web/20080916061358/http://planetquest.jpl.nasa.gov/atlas/atlas_profile.cfm?Planet=261 http://planetquest.jpl.nasa.gov]


{{star-stub}}
{{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}}
[[Category:Ara constellation]]
[[Category:G-type main sequence stars]]
[[Category:Henry Draper Catalogue objects|154857]]
[[Category:HIP objects|84069]]
{{main-star-stub}}
[[Category:Planetary systems]]


[[de:HD 154857]]
{{DEFAULTSORT:HD 154857}}
<!-- Properties -->
[[fa:اچ‌دی ۱۵۴۸۵۷]]
[[it:HD 154857]]
[[Category:G-type subgiants]]
[[Category:Planetary systems with two confirmed planets]]
[[ru:HD 154857]]
<!-- Other -->
[[sk:HD 154857]]
[[Category:Ara (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|154857]]
[[Category:Hipparcos objects|084069]]

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]


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