HD 172051: Difference between revisions

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{{short description|Star in the constellation Sagittarius}}
{{Starbox begin
{{Starbox begin
| name = HD 172051
| name = HD 172051
Line 5: Line 6:
| epoch = J2000
| epoch = J2000
| constell = [[Sagittarius (constellation)|Sagittarius]]
| constell = [[Sagittarius (constellation)|Sagittarius]]
| ra = {{RA|18|38|53.40151}}<ref name=GaiaDR2/>
| ra = {{RA|18|38|53.40}} <ref name="hipparcos">{{cite web | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=91135 | title=HIP 91438 | work=Hipparcos, the New Reduction | author=van Leeuwen, F. | year=2007 | accessdate=2009-12-12}}</ref>
| dec = {{DEC|-21|03|06.7}} <ref name="hipparcos"/>
| dec = {{DEC|-21|03|06.7415}}<ref name=GaiaDR2/>
| appmag_v = 5.866
| appmag_v = 5.85<ref name="AAA541_A40"/>
}}
}}
{{Starbox character
{{Starbox character
| class=G5 V
| class=G5&nbsp;V<ref name="AAA541_A40"/>
| b-v=0.65
| b-v=0.68<ref name=mnrassa27_11/>
| u-b=0.15
| u-b=
| variable=None }}
| variable=
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = +35.6
| radial_v = {{Val|+37.14|0.20}}<ref name=GaiaDR2/>
| prop_mo_ra = -74.85 ± 0.77 <ref name="hipparcos"/>
| prop_mo_ra = {{Val|−75.128|0.163}}<ref name=GaiaDR2/>
| prop_mo_dec = -152.00 ± 0.47 <ref name="hipparcos"/>
| prop_mo_dec = {{Val|−153.645|0.150}}<ref name=GaiaDR2/>
| parallax = 76.43
| parallax = 76.6355
| p_error = 0.47
| p_error = 0.1082
| parallax_footnote = <ref name="hipparcos"/>
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = 5.29 }}
| absmag_v = 5.27<ref name=Holmberg2009/>
}}
{{Starbox detail
{{Starbox detail
| mass=0.865<ref name=apjss168_2_297/> ''or'' 1.00<ref name=aa552_A78_62/>
| mass=1.0
| radius=0.86
| radius=0.90<ref name=apjss168_2_297/>
| luminosity=0.65
| luminosity=
| gravity=4.65<ref name="AAA541_A40"/>
| temperature=5,580
| temperature= 5,638<ref name="AAA541_A40"/>
| metal=
| metal_fe=–0.21<ref name="AAA541_A40"/>
| rotation=
| rotational_velocity=0.32<ref name=aaa520_A79/>
| age={{nowrap|(4.1–4.8) × 10<sup>9</sup>}}<ref name="apj687">{{cite journal
| age_gyr=4.1–4.8<ref name="apj687"/>
| author=Mamajek, Eric E.; Hillenbrand, Lynne A.
| title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
| journal=The Astrophysical Journal | volume=687 | issue=2
| pages=1264–1293 | month=November | year=2008
| doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 }}</ref>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names={{odlist | name=86 G. Sagittarii | BD=−21°&nbsp;5081 | GJ=722 | HD=172051 | HIP=91438 | HR=6998 | SAO=187086 | GCTP=4289.01 | WDS=J18389-2103AB }}<ref name=SIMBAD/>
| names=86 G. Sagittarii, [[Gliese-Jahreiss catalogue|GJ]] 722, [[Bright Star Catalogue|HR]] 6998, [[Durchmusterung|BD]] -21&deg;5081, [[General Catalogue of Trigonometric Parallaxes|GCTP]] 4289.01, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 187086, [[Hipparcos catalogue|HIP]] 91438. }}
}}
{{Starbox reference
| Simbad=HD+172051
}}
{{Starbox end}}
{{Starbox end}}
'''HD 172051''' ('''86 G. Sagittarii''') is a single,<ref name=Eggleton2008/> yellow-hued star in the southern [[constellation]] of [[Sagittarius (constellation)|Sagittarius]]. The star is barely bright enough to be seen with the naked eye, having an [[apparent visual magnitude]] of 5.85.<ref name="AAA541_A40"/> Based upon an annual [[stellar parallax|parallax shift]] of 76.64&nbsp;[[milliarcsecond|mas]], it is located some 43&nbsp;[[light year]]s from the Sun. It is moving away from the Sun with a [[radial velocity]] of +37&nbsp;km/s.<ref name=GaiaDR2/>
'''HD 172051''' ('''86 G. Sagittarii''') is a [[main sequence]] dwarf star in the
[[constellation]] [[Sagittarius (constellation)|Sagittarius]].


It is located about 42 [[light year]]s from the [[Sun]] and is considered a solar analog. It is similar in mass to the Sun, although it is cooler and has a lower luminosity. Due to this similarity, HD 172051 has been selected as an early target star for both the [[Terrestrial Planet Finder]] and [[Darwin (ESA)|Darwin]] missions, which seek to find an Earth-like [[extrasolar planet]].<ref>{{cite news | title=Planet hunters target nearby star | publisher=BBC News | date=2003-11-07 | url=http://news.bbc.co.uk/2/hi/science/nature/3237575.stm | accessdate=2006-08-04 }}</ref>
This ordinary [[G-type main-sequence star]] is considered a [[solar analog]], having physical properties sufficiently similar to the Sun. It has a [[stellar classification]] of G5&nbsp;V<ref name="AAA541_A40"/> and is around 4.5&nbsp;billion years old. The mass is similar to the Sun, although it is cooler and has a lower luminosity. Due to this similarity, HD 172051 has been selected as an early target star for both the [[Terrestrial Planet Finder]] and [[Darwin (ESA)|Darwin]] missions, which seek to find an Earth-like [[extrasolar planet]].<ref name=BBC031107/> During a search for [[brown dwarf]] companions using the [[Hale telescope]] in 2004, two candidate companions were identified at [[angular separation]]s of 5{{pprime}} and 6{{pprime}}. However, these were determined to be background stars.<ref name=pasp122_896_1195/>


==References==
==References==
{{reflist}}
{{reflist|refs=


<ref name=SIMBAD>{{cite simbad | title=HD 172051 | access-date=November 15, 2018 }}</ref>
==External links==
* {{cite web | url = http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+172051&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2006&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0 | title = HD 172051 -- Star | publisher = SIMBAD | accessdate = 2006-08-04 }}
* {{cite web | url = http://www.solstation.com/stars2/hd172051.htm | title = HD 172051 / HR 6998 | publisher = SolStation | accessdate = 2006-08-04 }}


<ref name=GaiaDR2>{{cite DR2}}</ref>
{{Nearest star systems|9}}


<ref name=Holmberg2009>{{citation
[[Category:Sagittarius (constellation)]]
| display-authors=1 | last1=Holmberg | first1=J.
| last2=Nordström | first2=B. | last3=Andersen | first3=J.
| title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics
| volume=501 | issue=3 |date=July 2009 | pages=941–947
| journal=Astronomy and Astrophysics
| doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H
| arxiv=0811.3982 | s2cid=118577511 | postscript=. }}</ref>

<ref name=Eggleton2008>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}</ref>

<ref name="apj687">{{cite journal | last1=Mamajek | first1=Eric E. | last2=Hillenbrand | first2=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 |date=November 2008 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M | arxiv=0807.1686 | s2cid=27151456 }}</ref>

<ref name=BBC031107>{{cite news | title=Planet hunters target nearby star | publisher=[[BBC News]] | date=2003-11-07 | url=http://news.bbc.co.uk/2/hi/science/nature/3237575.stm | access-date=2006-08-04 }}</ref>

<ref name="AAA541_A40">{{cite journal | last1=Maldonado | first1=J. | last2=Eiroa | first2=C. | last3=Villaver | first3=E. | last4=Montesinos | first4=B. | last5=Mora | first5=A. | display-authors=1 | title=Metallicity of solar-type stars with debris discs and planets | journal=Astronomy & Astrophysics | volume=541 | page=A40 |date=May 2012 | doi=10.1051/0004-6361/201218800 | bibcode=2012A&A...541A..40M |arxiv = 1202.5884 | s2cid=46328823 }}</ref>

<ref name=aaa520_A79>{{cite journal | display-authors=1 | last1=Martínez-Arnáiz | first1=R. | last2=Maldonado | first2=J. | last3=Montes | first3=D. | last4=Eiroa | first4=C. | last5=Montesinos | first5=B. | title=Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter | journal=Astronomy and Astrophysics | volume=520 | page=A79 | date=September 2010 | doi=10.1051/0004-6361/200913725 | bibcode=2010A&A...520A..79M | arxiv=1002.4391 | s2cid=43455849 | url=http://eprints.ucm.es/37826/1/davidmontes17libre.pdf | access-date=2018-11-04 | archive-date=2017-09-22 | archive-url=https://web.archive.org/web/20170922031257/http://eprints.ucm.es/37826/1/davidmontes17libre.pdf | url-status=dead }}</ref>

<ref name=mnrassa27_11>{{citation | last1=Corben | first1=P. M. | last2=Stoy | first2=R. H. | title=Photoelectric Magnitudes and Colours for Bright Southern Stars | journal=Monthly Notes of the Astronomical Society of Southern Africa | volume=27 | page=11 | year=1968 | bibcode=1968MNSSA..27...11C | postscript=. }}</ref>

<ref name=pasp122_896_1195>{{citation
| display-authors=1
| last1=Tanner | first1=Angelle M.
| last2=Gelino | first2=Christopher R.
| last3=Law | first3=Nicholas M.
| title=A High-Contrast Imaging Survey of SIM Lite Planet Search Targets
| journal=Publications of the Astronomical Society of the Pacific
| volume=122 | issue=896 | pages=1195–1206 | date=October 2010
| doi=10.1086/656481 | bibcode=2010PASP..122.1195T
| arxiv=1007.4315 | s2cid=118459054 | postscript=.
}}</ref>

<ref name=aa552_A78_62>{{citation
| display-authors=1
| last1=Zechmeister | first1=M.
| last2=Kürster | first2=M.
| last3=Endl | first3=M.
| last4=Lo Curto | first4=G.
| last5=Hartman | first5=H.
| last6=Nilsson | first6=H.
| last7=Henning | first7=T.
| last8=Hatzes | first8=A. P.
| last9=Cochran | first9=W. D.
| title=The planet search programme at the ESO CES and HARPS. IV. The search for Jupiter analogues around solar-like stars
| journal=Astronomy & Astrophysics
| volume=552 | id=A78 | pages=62 | date=April 2013
| doi=10.1051/0004-6361/201116551 | bibcode=2013A&A...552A..78Z
| arxiv=1211.7263 | s2cid=53694238 | postscript=.
}}</ref>

<ref name=apjss168_2_297>{{citation | display-authors=1 | last1=Takeda | first1=Genya | last2=Ford | first2=Eric B. | last3=Sills | first3=Alison | last4=Rasio | first4=Frederic A. | last5=Fischer | first5=Debra A. | last6=Valenti | first6=Jeff A. | title=Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog | journal=The Astrophysical Journal Supplement Series | volume=168 | issue=2 | pages=297–318 | doi=10.1086/509763 | bibcode=2007ApJS..168..297T |arxiv = astro-ph/0607235 |date=February 2007| s2cid=18775378 }}</ref>

}}

==Sources==
* {{cite simbad | title = HD 172051 | access-date = 2006-08-04 }}
* {{cite web | url = http://www.solstation.com/stars2/hd172051.htm | title = HD 172051 / HR 6998 | publisher = SolStation | access-date = 2006-08-04 }}

{{Stars of Sagittarius}}

{{DEFAULTSORT:HD 172051}}
[[Category:G-type main-sequence stars]]
[[Category:G-type main-sequence stars]]
[[Category:Solar-type stars|HD, 172051]]
[[Category:Solar-type stars|HD, 172051]]
[[Category:Sagittarius (constellation)]]
[[Category:Durchmusterung objects|BD-21 5081]]
[[Category:Gliese and GJ objects|0722]]
[[Category:Gould objects|Sagittarii, 86]]
[[Category:Henry Draper Catalogue objects|172051]]
[[Category:Henry Draper Catalogue objects|172051]]
[[Category:Hipparcos objects|091438]]
[[Category:Bright Star Catalogue objects|6998]]

Latest revision as of 00:07, 25 September 2023

HD 172051
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 38m 53.40151s[1]
Declination −21° 03′ 06.7415″[1]
Apparent magnitude (V) 5.85[2]
Characteristics
Spectral type G5 V[2]
B−V color index 0.68[3]
Astrometry
Radial velocity (Rv)+37.14±0.20[1] km/s
Proper motion (μ) RA: −75.128±0.163[1] mas/yr
Dec.: −153.645±0.150[1] mas/yr
Parallax (π)76.6355 ± 0.1082 mas[1]
Distance42.56 ± 0.06 ly
(13.05 ± 0.02 pc)
Absolute magnitude (MV)5.27[4]
Details
Mass0.865[5] or 1.00[6] M☉
Radius0.90[5] R☉
Surface gravity (log g)4.65[2] cgs
Temperature5,638[2] K
Metallicity [Fe/H]–0.21[2] dex
Rotational velocity (v sin i)0.32[7] km/s
Age4.1–4.8[8] Gyr
Other designations
86 G. Sagittarii, BD−21° 5081, GJ 722, HD 172051, HIP 91438, HR 6998, SAO 187086, WDS J18389-2103AB[9]
Database references
SIMBADdata

HD 172051 (86 G. Sagittarii) is a single,[10] yellow-hued star in the southern constellation of Sagittarius. The star is barely bright enough to be seen with the naked eye, having an apparent visual magnitude of 5.85.[2] Based upon an annual parallax shift of 76.64 mas, it is located some 43 light years from the Sun. It is moving away from the Sun with a radial velocity of +37 km/s.[1]

This ordinary G-type main-sequence star is considered a solar analog, having physical properties sufficiently similar to the Sun. It has a stellar classification of G5 V[2] and is around 4.5 billion years old. The mass is similar to the Sun, although it is cooler and has a lower luminosity. Due to this similarity, HD 172051 has been selected as an early target star for both the Terrestrial Planet Finder and Darwin missions, which seek to find an Earth-like extrasolar planet.[11] During a search for brown dwarf companions using the Hale telescope in 2004, two candidate companions were identified at angular separations of 5″ and 6″. However, these were determined to be background stars.[12]

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.
  2. ^ a b c d e f g Maldonado, J.; et al. (May 2012). "Metallicity of solar-type stars with debris discs and planets". Astronomy & Astrophysics. 541: A40. arXiv:1202.5884. Bibcode:2012A&A...541A..40M. doi:10.1051/0004-6361/201218800. S2CID 46328823.
  3. ^ Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  4. ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
  5. ^ a b Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235, Bibcode:2007ApJS..168..297T, doi:10.1086/509763, S2CID 18775378
  6. ^ Zechmeister, M.; et al. (April 2013), "The planet search programme at the ESO CES and HARPS. IV. The search for Jupiter analogues around solar-like stars", Astronomy & Astrophysics, 552: 62, arXiv:1211.7263, Bibcode:2013A&A...552A..78Z, doi:10.1051/0004-6361/201116551, S2CID 53694238, A78.
  7. ^ Martínez-Arnáiz, R.; et al. (September 2010). "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF). Astronomy and Astrophysics. 520: A79. arXiv:1002.4391. Bibcode:2010A&A...520A..79M. doi:10.1051/0004-6361/200913725. S2CID 43455849. Archived from the original (PDF) on 2017-09-22. Retrieved 2018-11-04.
  8. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. arXiv:0807.1686. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. S2CID 27151456.
  9. ^ "HD 172051". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 15, 2018.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  11. ^ "Planet hunters target nearby star". BBC News. 2003-11-07. Retrieved 2006-08-04.
  12. ^ Tanner, Angelle M.; et al. (October 2010), "A High-Contrast Imaging Survey of SIM Lite Planet Search Targets", Publications of the Astronomical Society of the Pacific, 122 (896): 1195–1206, arXiv:1007.4315, Bibcode:2010PASP..122.1195T, doi:10.1086/656481, S2CID 118459054.

Sources[edit]

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