HD 1237: Difference between revisions

HD 1237
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Hydrus
Right ascension	00h 16m 12.6791s
Declination	−79° 51′ 04.2447″
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
Astrometry
Radial velocity (Rv)	−5.2±0.2 km/s
Proper motion (μ)	RA: 433.908±0.044 mas/yr ; Dec.: −56.322±0.039 mas/yr
Parallax (π)	56.9319 ± 0.0235 mas
Distance	57.29 ± 0.02 ly ; (17.565 ± 0.007 pc)
Absolute magnitude (MV)	5.37 ± 0.01
Details
HD 1237 A
Mass	1.00 ± 0.10 M☉
Radius	0.86 ± 0.07 R☉
Luminosity	0.64 L☉
Surface gravity (log g)	4.58 ± 0.09 cgs
Temperature	5,572 ± 40 K
Metallicity [Fe/H]	0.12 ± 0.04 dex
Rotation	7.0±0.7 d
Rotational velocity (v sin i)	5.3±1.0 km/s
Age	800 Myr
HD 1237 B
Mass	0.13 M☉
Other designations
	2 G. Hydri, CD−80° 9, GJ 3021, HD 1237, HIP 1292, SAO 258219, 2MASS J00161266-7951042
Database references
SIMBAD	data

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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

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

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 $M$ _J	0.49	133.71 ± 0.20	0.511 ± 0.017	—	—

References

^ ^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.
^ ^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.
^ ^a ^b ^c Alvarado-Gómez, J. D.; et al. (2015). "Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237". Astronomy and Astrophysics. 582. A38. arXiv:1507.04117. Bibcode:2015A&A...582A..38A. doi:10.1051/0004-6361/201525771. S2CID 39311967.
^ Holmberg; et al. (2009). "HD 1237". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-12-04.
^ ^a ^b ^c ^d ^e ^f Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290, S2CID 118565025
^ ^a ^b Saffe, C.; et al. (2005). "On the Ages of Exoplanet Host Stars". Astronomy and Astrophysics. 443 (2): 609–626. arXiv:astro-ph/0510092. Bibcode:2005A&A...443..609S. doi:10.1051/0004-6361:20053452. S2CID 11616693.
^ ^a ^b Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. S2CID 16606841.
^ Chauvin, G.; et al. (2006). "Probing long-period companions to planetary hosts". Astronomy and Astrophysics. 456 (3): 1165–1172. arXiv:astro-ph/0606166. Bibcode:2006A&A...456.1165C. doi:10.1051/0004-6361:20054709. S2CID 15611548.
^ Han; et al. (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal. 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927. S2CID 120952927. Archived from the original on 2015-11-06. Retrieved 2009-03-09.
^ Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv:astro-ph/0104412. Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. S2CID 378792.

[Gaia_DR2-1] 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.

[Chauvin2007-2] 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.

[Alvarado-Gómez2015-3] Alvarado-Gómez, J. D.; et al. (2015). "Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237". Astronomy and Astrophysics. 582. A38. arXiv:1507.04117. Bibcode:2015A&A...582A..38A. doi:10.1051/0004-6361/201525771. S2CID 39311967.

[Holmberg2009-4] Holmberg; et al. (2009). "HD 1237". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-12-04.

[apj720_2_1290-5] ^ ^a ^b ^c ^d ^e ^f Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290, S2CID 118565025

[Saffe2005-6] Saffe, C.; et al. (2005). "On the Ages of Exoplanet Host Stars". Astronomy and Astrophysics. 443 (2): 609–626. arXiv:astro-ph/0510092. Bibcode:2005A&A...443..609S. doi:10.1051/0004-6361:20053452. S2CID 11616693.

[Naef2001-7] Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. S2CID 16606841.

[Chauvin2006-8] Chauvin, G.; et al. (2006). "Probing long-period companions to planetary hosts". Astronomy and Astrophysics. 456 (3): 1165–1172. arXiv:astro-ph/0606166. Bibcode:2006A&A...456.1165C. doi:10.1051/0004-6361:20054709. S2CID 15611548.

[9] Han; et al. (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal. 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927. S2CID 120952927. Archived from the original on 2015-11-06. Retrieved 2009-03-09.

[10] Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv:astro-ph/0104412. Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. S2CID 378792.

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@@ Line 1: / Line 1: @@
+{{Short description|Binary star system in the constrellation Hydrus}}
 {{Starbox begin
 | name = HD 1237
@@ Line 45: / Line 46: @@
 }}
 {{Starbox catalog
-| names = 2 G. Hydri, {{odlist|GJ=3021|HD=1237|HIP=1292|CD=-80° 9|SAO=258219}}
+| names = 2 G. Hydri, {{odlist|GJ=3021|HD=1237|HIP=1292|CD=-80° 9|SAO=258219|2MASS=J00161266-7951042}}
 }}
 {{Starbox reference
@@ Line 62: / Line 63: @@
 ==Planetary system==
-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 | 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 |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 }}</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>
 {{OrbitboxPlanet begin
@@ Line 84: / Line 85: @@
 {{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 }}</ref>
+<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="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 }}</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="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 }}</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>
@@ Line 94: / Line 95: @@
 <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="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 }}</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 }}</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 }}</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>
 }}
@@ Line 105: / Line 106: @@
 {{Stars of Hydrus}}
+{{DEFAULTSORT:HD 1237}}
-[[Category:Durchmusterung objects]]
+[[Category:Durchmusterung objects|CD-80 9]]
 [[Category:Gliese and GJ objects|3021]]
 [[Category:Henry Draper Catalogue objects|001237]]
 [[Category:Hipparcos objects|001292]]
-[[Category:Hydrus (constellation)]]
+[[Category:Hydrus]]
 [[Category:Planetary systems with one confirmed planet]]
 [[Category:Binary stars]]
 [[Category:G-type main-sequence stars]]
+[[Category:2MASS objects|J00161266-7951042]]

Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Hydrus
Right ascension	00^h 16^m 12.6791^s^[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 (R_v)	−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]
Distance	57.29 ± 0.02 ly (17.565 ± 0.007 pc)
Absolute magnitude (M_V)	5.37 ± 0.01^[4]

Details
HD 1237 A
Mass	1.00 ± 0.10^[5] `M`_☉
Radius	0.86 ± 0.07^[5] `R`_☉
Luminosity	0.64^[5] `L`_☉
Surface gravity (log g)	4.58 ± 0.09^[5] cgs
Temperature	5,572 ± 40^[5] K
Metallicity [Fe/H]	0.12 ± 0.04^[5] dex
Rotation	7.0±0.7 d^[3]
Rotational velocity (v sin i)	5.3±1.0^[3] km/s
Age	800^[6] Myr
HD 1237 B
Mass	0.13^[2] `M`_☉
Other designations
2 G. Hydri, CD−80° 9, GJ 3021, HD 1237, HIP 1292, SAO 258219, 2MASS J00161266-7951042
Database references
SIMBAD	data

Latest revision as of 15:04, 25 December 2023

Stellar components

Planetary system

See also

References