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Coordinates: Sky map 00h 16m 12.6775s, −79° 51′ 04.254″
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{{Short description|Binary star system in the constrellation Hydrus}}
{{Starbox begin
{{Starbox begin
| name = GJ 3021
| name = HD 1237
}}
}}
{{Starbox observe
{{Starbox observe
| epoch = J2000.0
| epoch = J2000.0
| constell = [[Hydrus]]
| constell = [[Hydrus]]
| ra = {{RA|00|16|12.68}}<ref name="hipparcos"/>
| ra = {{RA|00|16|12.6791}}<ref name="Gaia DR2"/>
| dec = {{DEC|-79|51|04.2}}<ref name="hipparcos"/>
| dec = {{DEC|−79|51|04.2447}}<ref name="Gaia DR2"/>
| appmag_v = 6.59
| appmag_v = 6.59
}}
}}
{{Starbox character
{{Starbox character
| component1 = HD 1237 A
| class = G6&nbsp;V
| class = G6&nbsp;V
| r-i = <!--R-I color-->
| r-i = <!--R-I color-->
Line 16: Line 18:
| u-b = <!--U-B color-->
| u-b = <!--U-B color-->
| variable = <!--Variability type-->
| variable = <!--Variability type-->
| component2 = HD 1237 B
| class2 = M4 V<ref name="Chauvin2007"/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = <!--Radial velocity (in km/sec)-->
| radial_v = {{val|−5.2|0.2}}<ref name="Alvarado-Gómez2015"/>
| prop_mo_ra = {{nowrap|+433.92 ± 0.30}}<ref name="hipparcos"/>
| prop_mo_ra = {{val|433.908|0.044}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{nowrap|-56.74 ± 0.29}}<ref name="hipparcos"/>
| prop_mo_dec = {{val|−56.322|0.039}}<ref name="Gaia DR2"/>
| parallax = 57.15
| parallax = 56.9319
| p_error = 0.29
| p_error = 0.0235
| parallax_footnote = <ref name="hipparcos"/>
| parallax_footnote = <ref name="Gaia DR2"/>
| absmag_v = {{nowrap|5.37 ± 0.01}}<ref name="Holmberg2009"/>
| absmag_v = {{nowrap|5.37 ± 0.01}}<ref name="Holmberg2009"/>
}}
}}
{{Starbox detail
{{Starbox detail
| source = <!--[source url]-->
| source = <!--[source url]-->
| component1 = HD 1237 A
| mass = {{nowrap|1.00 ± 0.10}}<ref name=apj720_2_1290/>
| mass = {{nowrap|1.00 ± 0.10}}<ref name=apj720_2_1290/>
| radius = {{nowrap|0.86 ± 0.07}}<ref name=apj720_2_1290/>
| radius = {{nowrap|0.86 ± 0.07}}<ref name=apj720_2_1290/>
Line 34: Line 39:
| temperature = {{nowrap|5,572 ± 40}}<ref name=apj720_2_1290/>
| temperature = {{nowrap|5,572 ± 40}}<ref name=apj720_2_1290/>
| metal_fe = {{nowrap|0.12 ± 0.04}}<ref name=apj720_2_1290/>
| metal_fe = {{nowrap|0.12 ± 0.04}}<ref name=apj720_2_1290/>
| rotation = {{val|7.0|0.7|u=days}}<ref name="Alvarado-Gómez2015"/>
| rotational_velocity = 5.5
| rotational_velocity = {{val|5.3|1.0}}<ref name="Alvarado-Gómez2015"/>
| age_myr = 800<ref name="Saffe2005"/>
| age_myr = 800<ref name="Saffe2005"/>
| component2 = HD 1237 B
| mass2 = 0.13<ref name="Chauvin2007"/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = 2 G. Hydri, GJ 3021, [[Henry Draper Catalogue|HD]] 1237, [[Hipparcos Catalogue|HIP]] 1292.
| names = 2 G. Hydri, {{odlist|GJ=3021|HD=1237|HIP=1292|CD=-80° 9|SAO=258219|2MASS=J00161266-7951042}}
}}
}}
{{Starbox reference
{{Starbox reference
| Simbad = HD+1237
| Simbad = HD+1237
| ARICNS = <!--Code-->
}}
}}
{{Starbox end}}
{{Starbox end}}


'''GJ 3021''' ('''2 G. Hydri''') is a [[binary star]] system approximately 57 [[light-year]]s away in the [[constellation]] of [[Hydrus]] (the Water Snake).
'''HD 1237''' is a [[binary star]] system approximately 57 [[light-year]]s away in the [[constellation]] of [[Hydrus]] (the Water Snake).


The visible star in the system, A, is considered to be a [[Solar twin]]. As of 2000, it has been confirmed that an [[extrasolar planet]] orbits the star. It is of note for being a relatively Sun-like star not very far from the Sun that is home to an extrasolar planet.<ref name="Naef2001"/>
The visible star in the system, A, is considered to be a [[solar analog]] due close mass to the sun. HD 1237 differs from the sun in that HD 1237 is much younger, has high metallicity, has much cooler temperature and is in a binary system. As of 2000, it has been confirmed that an [[Exoplanet|extrasolar planet]] orbits the star. It is of note for being a relatively Sun-like star not very far from the Sun that is home to an extrasolar planet.<ref name="Naef2001"/>


== Stellar components ==
==Stellar components==
⚫
As a nearby Sun-like star, the last decade has seen HD 1237 A being studied carefully for the first time, especially after its substellar companion was discovered. It is currently believed that it is 800 million years old, though age estimates range from 150 million to 8.8 billion years old depending on the method used for the determination.<ref name="Saffe2005"/> The star is more enriched with [[iron]] than the Sun, is chromospherically active, and rotates around its axis more quickly than the Sun.


The secondary star was discovered in 2006 during a deep imaging survey conducted at the [[European Southern Observatory]] using the [[Very Large Telescope]].<ref name="Chauvin2006"/> HD 1237 B is a M4 [[red dwarf]] star at a [[projected separation]] of 68 [[astronomical unit|AU]].<ref name="Chauvin2007"/>
⚫
As a nearby Sun-like star, the last decade has seen GJ 3021 A being studied carefully for the first time, especially after its substellar companion was discovered. It is currently believed that it is 800 million years old, though age estimates range from 150 million to 8.8 billion years old depending on the method used for the determination. <ref name="Saffe2005"/> The star is more enriched with [[iron]] than the Sun, is chromospherically active, and rotates around its axis more quickly than the Sun.


⚫
==Planetary system==
The secondary star GJ 3021 B is a M4 [[red dwarf]] star at a projected physical separation of 68 [[astronomical unit|AU]].<ref>{{Cite journal | url=http://www.aanda.org/articles/aa/abs/2007/44/aa7046-06/aa7046-06.html | title=Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442 | author=Chauvin | journal=[[Astronomy and Astrophysics]] | year=2007 | volume=475 | issue=2 | pages=723–727 | doi=10.1051/0004-6361:20067046 | format=abstract | last2=Lagrange | first2=A.-M. | last3=Udry | first3=S. | last4=Mayor | first4=M. | bibcode=2007A&A...475..723C | display-authors=1}} ([http://arxiv.org/abs/0710.5918 web preprint])</ref>
⚫
Announced in 2000, the [[Jovian planet]] [[GJ 3021 b]] (GJ 3021 being an alternate less-used designation for this star) orbits about 0.5 [[astronomical unit]]s from HD 1237 A with a minimum mass 3.37 times that of Jupiter, as determined by measuring variations in the [[radial velocity]] of the star. A study published in 2001 suggested that the usual inability to determine the [[orbital inclination]] of an extrasolar planet through radial velocity measurement had caused this mass to be severely underestimated.<ref>{{cite journal | url=http://www.iop.org/EJ/article/1538-4357/548/1/L57/005774.html | author=Han | title=Preliminary astrometric masses for proposed extrasolar planetary companions | journal=The Astrophysical Journal | volume=548 | issue=1 | pages=L57–L60 | date=2001 | doi=10.1086/318927 | last2=Black | first2=David C. | last3=Gatewood | first3=George | bibcode=2001ApJ...548L..57H | s2cid=120952927 | display-authors=1 | doi-access= | access-date=2009-03-09 | archive-date=2015-11-06 | archive-url=https://web.archive.org/web/20151106181810/http://www.iop.org/EJ/article/1538-4357/548/1/L57/005774.html | url-status=dead }}</ref> The [[astrometry|astrometric]] orbit gives an orbital inclination of 11.8° and a mass of 16 Jupiter masses, which would make the object a [[brown dwarf]]. However, later analysis showed that [[Hipparcos]] was not sensitive enough to accurately determine astrometric orbits for substellar companions, which means the inclination (and hence the true mass) of the planet are still unknown.<ref>{{cite journal | url=http://www.aanda.org/articles/aa/full/2001/24/aa1274/aa1274.html | title=Screening the Hipparcos-based astrometric orbits of sub-stellar objects |author1=Pourbaix, D. |author2=Arenou, F. | journal=[[Astronomy and Astrophysics]] | volume=372 | pages=935–944 | date=2001 | doi=10.1051/0004-6361:20010597 | bibcode=2001A&A...372..935P|arxiv = astro-ph/0104412 | issue=3 | s2cid=378792 }}</ref>

⚫
== Planetary system ==

⚫
Announced in 2000, the [[Jovian planet]] [[GJ 3021 b]] orbits about 0.5 [[astronomical unit]]s from GJ 3021 A with a minimum mass 3.37 times that of Jupiter, as determined by measuring variations in the [[radial velocity]] of the star. A study published in 2001 suggested that the usual inability to determine the [[orbital inclination]] of an extrasolar planet through radial velocity measurement had caused this mass to be severely underestimated.<ref>{{cite journal | url=http://www.iop.org/EJ/article/1538-4357/548/1/L57/005774.html | author=Han | title=Preliminary astrometric masses for proposed extrasolar planetary companions | journal=The [[Astrophysical Journal]] | volume=548 | issue=1 | pages=L57–L60 | year=2001 | doi=10.1086/318927 | last2=Black | first2=David C. | last3=Gatewood | first3=George | bibcode=2001ApJ...548L..57H | display-authors=1}}</ref> The [[astrometry|astrometric]] orbit gives an orbital inclination of 11.8° and a mass of 16 Jupiter masses, which would make the object a [[brown dwarf]]. However later analysis showed that Hipparcos was not sensitive enough to accurately determine astrometric orbits for substellar companions, which means the inclination (and hence the true mass) of the planet are still unknown.<ref>{{cite journal | url=http://www.aanda.org/articles/aa/full/2001/24/aa1274/aa1274.html | title=Screening the Hipparcos-based astrometric orbits of sub-stellar objects | author=Pourbaix, D. and Arenou, F. | journal=[[Astronomy and Astrophysics]] | volume=372 | pages=935–944 | year=2001 | doi=10.1051/0004-6361:20010597 | bibcode=2001A&A...372..935P|arxiv = astro-ph/0104412 | issue=3 }}</ref>


{{OrbitboxPlanet begin
{{OrbitboxPlanet begin
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{{Orbitbox end}}
{{Orbitbox end}}


== See also ==
==See also==
*[[Epsilon Reticuli]]
*[[Epsilon Reticuli]]
*[[HD 196885]]
*[[HD 196885]]
*[[List of extrasolar planets]]
*[[List of extrasolar planets]]


== References ==
==References==
{{Reflist|colwidth=30em|refs=
{{Reflist|refs=


<ref name="Alvarado-Gómez2015">{{Cite journal | title=Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237 | url=https://www.aanda.org/articles/aa/full_html/2015/10/aa25771-15/aa25771-15.html | last1=Alvarado-Gómez | first1=J. D. | last2=Hussain | first2=G. A. J. | last3=Grunhut | first3=J. | last4=Fares | first4=R. | last5=Donati | first5=J.-F. | last6=Alecian | first6=E. | last7=Kochukhov | first7=O. | last8=Oksala | first8=M. | last9=Morin | first9=J. | last10=Redfield | first10=S. | last11=Cohen | first11=O. | last12=Drake | first12=J. J. | last13=Jardine | first13=M. | last14=Matt | first14=S. | last15=Petit | first15=P. | last16=Walter | first16=F. M. | display-authors=1 | journal=Astronomy and Astrophysics | volume=582 | at=A38 | year=2015 | arxiv=1507.04117 | bibcode=2015A&A...582A..38A | doi=10.1051/0004-6361/201525771 | s2cid=39311967 }}</ref>
⚫
<ref name="hipparcos">{{cite web | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=1290 | title=HIP 1292 | work=Hipparcos, the New Reduction | author=van Leeuwen, F. | year=2007 | accessdate=2009-12-04}}</ref>


⚫
<ref name="Chauvin2006">{{Cite journal | title=Probing long-period companions to planetary hosts | url=https://www.aanda.org/articles/aa/full/2006/36/aa4709-05/aa4709-05.html | last1=Chauvin | first1=G. | last2=Lagrange | first2=A.-M. | last3=Udry | first3=S. | last4=Fusco | first4=T. | last5=Galland | first5=F. | last6=Naef | first6=D. | last7=Beuzit | first7=J.-L. | last8=Mayor | first8=M. | journal=Astronomy and Astrophysics | volume=456 | issue=3 | pages=1165–1172 | year=2006 | display-authors=1 | arxiv=astro-ph/0606166 | bibcode=2006A&A...456.1165C | doi=10.1051/0004-6361:20054709 | s2cid=15611548 }}</ref>
<ref name="Holmberg2009"> {{cite web | url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/130/gcs3&recno=144 | title=HD 1237 | work=Geneva-Copenhagen Survey of Solar neighbourhood III | author=Holmberg ''et al.'' | year=2009 | accessdate=2010-12-04}}</ref>


<ref name="Naef2001"> {{cite journal | title=The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets | url=http://www.aanda.org/articles/aa/full/2001/31/aa10239/aa10239.html | last1=Naef | first1=D. | last2=Mayor | first2=M. | last3=Pepe | first3=F. | last4=Queloz | first4=D. | last5=Santos | first5=N. C. | last6=Udry | first6=S. | last7=Burnet | first7=M. | display-authors=1 | journal=Astronomy and Astrophysics | volume=375 | issue=1 | year=2001 | pages=205–218 | doi=10.1051/0004-6361:20010841 | bibcode=2001A&A...375..205N | arxiv=astro-ph/0106255 }}</ref>
<ref name="Chauvin2007">{{Cite journal | title=Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442| url=http://www.aanda.org/articles/aa/full/2007/44/aa7046-06/aa7046-06.html | last1=Chauvin | first1=G. | last2=Lagrange | first2=A.-M. | last3=Udry | first3=S. | last4=Mayor | first4=M. | display-authors=1 | journal=Astronomy and Astrophysics | volume=475 | issue=2 | pages=723–727 | year=2007 | arxiv=0710.5918 | bibcode=2007A&A...475..723C | doi=10.1051/0004-6361:20067046 | s2cid=16950822 }}</ref>


<ref name="Gaia DR2">{{Cite Gaia DR2|4634528720388462592}}</ref>
⚫
<ref name="Saffe2005"> {{cite journal | title=On the Ages of Exoplanet Host Stars | url=http://www.aanda.org/articles/aa/full/2005/44/aa3452-05/aa3452-05.html | last1=Saffe | first1=C. | last2=Gómez | first2=M. | last3=Chavero | first3=C. | display-authors=1 | journal=Astronomy and Astrophysics | volume=443 | issue=2 | pages=609–626 | year=2005 | doi=10.1051/0004-6361:20053452 | bibcode=2005A&A...443..609S | arxiv=astro-ph/0510092 }}</ref>


⚫
<ref name="Holmberg2009">{{cite web | url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/130/gcs3&recno=144 | title=HD 1237 | work=Geneva-Copenhagen Survey of Solar neighbourhood III | author=Holmberg | display-authors=etal | date=2009 | accessdate=2010-12-04}}</ref>
⚫
<ref name=apj720_2_1290>{{citation | display-authors=1 | last1=Ghezzi | first1=L. | last2=Cunha | first2=K. | last3=Smith | first3=V. V. | last4=de Araújo | first4=F. X. | last5=Schuler | first5=S. C. | last6=de la Reza | first6=R. | title=Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity | journal=The Astrophysical Journal | volume=720 | issue=2 | pages=1290–1302 | month=September | year=2010 | doi=10.1088/0004-637X/720/2/1290 | bibcode=2010ApJ...720.1290G }}</ref>


<ref name="Naef2001">{{cite journal | title=The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets | url=http://www.aanda.org/articles/aa/full/2001/31/aa10239/aa10239.html | last1=Naef | first1=D. | last2=Mayor | first2=M. | last3=Pepe | first3=F. | last4=Queloz | first4=D. | last5=Santos | first5=N. C. | last6=Udry | first6=S. | last7=Burnet | first7=M. | display-authors=1 | journal=Astronomy and Astrophysics | volume=375 | issue=1 | pages=205–218 | year=2001 | arxiv=astro-ph/0106255 | bibcode=2001A&A...375..205N | doi=10.1051/0004-6361:20010841 | s2cid=16606841 }}</ref>
⚫
}}

<ref name="Saffe2005">{{cite journal | title=On the Ages of Exoplanet Host Stars | url=http://www.aanda.org/articles/aa/full/2005/44/aa3452-05/aa3452-05.html | last1=Saffe | first1=C. | last2=Gómez | first2=M. | last3=Chavero | first3=C. | display-authors=1 | journal=Astronomy and Astrophysics | volume=443 | issue=2 | pages=609–626 | year=2005 | arxiv=astro-ph/0510092 | bibcode=2005A&A...443..609S | doi=10.1051/0004-6361:20053452 | s2cid=11616693 }}</ref>

⚫
<ref name=apj720_2_1290>{{citation | display-authors=1 | last1=Ghezzi | first1=L. | last2=Cunha | first2=K. | last3=Smith | first3=V. V. | last4=de Araújo | first4=F. X. | last5=Schuler | first5=S. C. | last6=de la Reza | first6=R. | title=Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity | journal=The Astrophysical Journal | volume=720 | issue=2 | pages=1290–1302 | date=September 2010 | doi=10.1088/0004-637X/720/2/1290 | bibcode=2010ApJ...720.1290G |arxiv = 1007.2681 | s2cid=118565025 }}</ref>


⚫
}}
== External links ==


* {{cite web |url=http://www.extrasolar.net/startour.asp?StarCatId=normal&StarId=79 |title=GJ 3021 |accessdate=2008-06-24 |work=Extrasolar Visions}}
* {{cite web |url=http://www.solstation.com/stars2/gj3021.htm |title=GJ 3021 / HD 1237 / CD-80 9 |accessdate=2008-06-24 |work=SolStation}}
* {{cite web |url=http://exoplanet.eu/star.php?st=GJ+3021 |title=Notes for star GJ 3021 |accessdate=2008-06-24 |work=The Extrasolar Planets Encyclopaedia}}
{{Sky|00|16|12.6775|-|79|51|04.254|57.47}}
{{Sky|00|16|12.6775|-|79|51|04.254|57.47}}
{{Stars of Hydrus}}
{{Nearest bright star systems|6.}}


{{DEFAULTSORT:HD 1237}}
[[Category:Durchmusterung objects|CD-80 9]]
[[Category:Gliese and GJ objects|3021]]
[[Category:Gliese and GJ objects|3021]]
[[Category:Hydrus (constellation)]]
[[Category:Henry Draper Catalogue objects|001237]]
[[Category:Planetary systems]]
[[Category:Hipparcos objects|001292]]
[[Category:Hydrus]]
[[Category:Planetary systems with one confirmed planet]]
[[Category:Binary stars]]
[[Category:Binary stars]]
[[Category:G-type main sequence stars]]
[[Category:G-type main-sequence stars]]
[[Category:2MASS objects|J00161266-7951042]]

[[de:GJ 3021]]
[[es:Gliese 3021]]
[[fa:جی‌جی ۳۰۲۱]]
[[fr:Gliese 3021]]
[[ko:글리제 3021]]
[[ja:GJ 3021]]
[[ru:HD 1237]]
[[sk:Gliese 3021]]
[[sv:GJ 3021]]
[[zh:格利泽3021]]

Latest revision as of 15:04, 25 December 2023

HD 1237
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydrus
Right ascension 00h 16m 12.6791s[1]
Declination −79° 51′ 04.2447″[1]
Apparent magnitude (V) 6.59
Characteristics
HD 1237 A
Spectral type G6 V
B−V color index 0.749
HD 1237 B
Spectral type M4 V[2]
Astrometry
Radial velocity (Rv)−5.2±0.2[3] km/s
Proper motion (μ) RA: 433.908±0.044[1] mas/yr
Dec.: −56.322±0.039[1] mas/yr
Parallax (π)56.9319 ± 0.0235 mas[1]
Distance57.29 ± 0.02 ly
(17.565 ± 0.007 pc)
Absolute magnitude (MV)5.37 ± 0.01[4]
Details
HD 1237 A
Mass1.00 ± 0.10[5] M☉
Radius0.86 ± 0.07[5] R☉
Luminosity0.64[5] L☉
Surface gravity (log g)4.58 ± 0.09[5] cgs
Temperature5,572 ± 40[5] K
Metallicity [Fe/H]0.12 ± 0.04[5] dex
Rotation7.0±0.7 d[3]
Rotational velocity (v sin i)5.3±1.0[3] km/s
Age800[6] Myr
HD 1237 B
Mass0.13[2] M☉
Other designations
2 G. Hydri, CD−80° 9, GJ 3021, HD 1237, HIP 1292, SAO 258219, 2MASS J00161266-7951042
Database references
SIMBADdata

HD 1237 is a binary star system approximately 57 light-years away in the constellation of Hydrus (the Water Snake).

The visible star in the system, A, is considered to be a solar analog due close mass to the sun. HD 1237 differs from the sun in that HD 1237 is much younger, has high metallicity, has much cooler temperature and is in a binary system. As of 2000, it has been confirmed that an extrasolar planet orbits the star. It is of note for being a relatively Sun-like star not very far from the Sun that is home to an extrasolar planet.[7]

Stellar components

[edit]

As a nearby Sun-like star, the last decade has seen HD 1237 A being studied carefully for the first time, especially after its substellar companion was discovered. It is currently believed that it is 800 million years old, though age estimates range from 150 million to 8.8 billion years old depending on the method used for the determination.[6] The star is more enriched with iron than the Sun, is chromospherically active, and rotates around its axis more quickly than the Sun.

The secondary star was discovered in 2006 during a deep imaging survey conducted at the European Southern Observatory using the Very Large Telescope.[8] HD 1237 B is a M4 red dwarf star at a projected separation of 68 AU.[2]

Planetary system

[edit]

Announced in 2000, the Jovian planet GJ 3021 b (GJ 3021 being an alternate less-used designation for this star) orbits about 0.5 astronomical units from HD 1237 A with a minimum mass 3.37 times that of Jupiter, as determined by measuring variations in the radial velocity of the star. A study published in 2001 suggested that the usual inability to determine the orbital inclination of an extrasolar planet through radial velocity measurement had caused this mass to be severely underestimated.[9] The astrometric orbit gives an orbital inclination of 11.8° and a mass of 16 Jupiter masses, which would make the object a brown dwarf. However, later analysis showed that Hipparcos was not sensitive enough to accurately determine astrometric orbits for substellar companions, which means the inclination (and hence the true mass) of the planet are still unknown.[10]

The HD 1237 planetary system[7]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >3.37 MJ 0.49 133.71 ± 0.20 0.511 ± 0.017 — —

See also

[edit]

References

[edit]
  1. ^ a b c d e 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 Chauvin, G.; et al. (2007). "Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442". Astronomy and Astrophysics. 475 (2): 723–727. arXiv:0710.5918. Bibcode:2007A&A...475..723C. doi:10.1051/0004-6361:20067046. S2CID 16950822.
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