HD 30177#Planetary system
{{Short description|Star in the constellation Dorado}}
{{Starbox begin
| name = HD 30177
}}
{{Starbox observe
| epoch = J2000.0
| constell = Dorado
}}
{{Starbox character
| variable =
}}
{{Starbox astrometry
| radial_v = 62.697{{±|0.0013}}
| prop_mo_ra = 66.303{{±|0.023}}
| prop_mo_dec = −11.795{{±|0.024}}
| parallax = 18.0190
| p_error = 0.0195
}}
{{Starbox detail
| mass = 1.053{{±|0.023}}
| radius = 1.019{{±|0.034}}
| gravity = 4.417{{±|0.034}}
| temperature = 5,607{{±|47}}
| metal_fe = 0.39{{±|0.05}}
| rotation = {{val|45|u=days|p=~}}
| rotational_velocity = 2.96{{±|0.50}}
| age_gyr = {{val|4.8|1.5|u=Gyr}}
2.525{{±|1.954}}
}}
{{Starbox catalog
| names = {{odlist | 2MASS=J04415438-5801146 | CD=−58°984 | HD=30177 | HIP=21850 | SAO=233633 }}
}}
{{Starbox reference
| Simbad = HD+30177
}}
{{Starbox end}}
HD 30177 is a single star with a pair of orbiting exoplanets in the southern constellation Dorado. Based on parallax measurements, it is located at a distance of 181 light years from the Sun. It has an absolute magnitude of 4.72, but at that distance the star is too faint to be viewed by the naked eye with an apparent visual magnitude of 8.41. The star is drifting further away with a radial velocity of 62.7 km/s.
The spectrum of HD 30177 matches a late G-type main-sequence star with a stellar classification of G8V. It is a yellow dwarf with a mass and radius similar to the Sun that is fusing hydrogen in its core. The chromosphere shows a negligible level of magnetic activity. The abundance of iron, an indicator of the star's metallicity, is more than double the Sun's. It is radiating a similar luminosity to the Sun from its photosphere at an effective temperature of 5,607 K.
A 2024 multiplicity survey, using astrometry from the Gaia spacecraft, identified a proper motion companion to HD 30177. This co-moving companion is a red dwarf star, around 10% the mass of the Sun, is located at 780" from HD 30177 with a position angle of 188°. The angular distance translates to an observed separation of 43,300 astronomical units.{{cite journal |last1=González-Payo |first1=J. |title=Multiplicity of stars with planets in the solar neighbourhood |date=2024-07-29 |arxiv=2407.20138 |last2=Caballero |first2=J. A. |last3=Gorgas |first3=J. |last4=Cortés-Contreras |first4=M. |last5=Gálvez-Ortiz |first5=M.-C. |last6=Cifuentes |first6=C.|journal=Astronomy & Astrophysics |volume=689 |pages=A302 |doi=10.1051/0004-6361/202450048 |bibcode=2024A&A...689A.302G }}
Planetary system
The Anglo-Australian Planet Search team announced the discovery of HD 30177 b, which has a minimum mass 8 times that of Jupiter, on June 13, 2002. The scientific paper describing the discovery was published in The Astrophysical Journal in 2003. A second massive gas giant planet was later discovered in an approximately 32 year orbit. In 2022, the inclination and estimated mass of both planets were measured via astrometry.
{{OrbitboxPlanet begin
| period_unit = year
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = 8.403{{±|1.241|0.489}}
| semimajor = 3.604{{±|0.135|0.147}}
| period = 6.884{{±|0.014|0.012}}
| eccentricity = 0.207{{±|0.012|0.017}}
| inclination = 85.393{{±|14.354|18.742}}
}}
{{OrbitboxPlanet
| exoplanet = c
| mass = 6.150{{±|1.308|0.341}}
| semimajor = 10.258{{±|0.535|0.480}}
| period = 33.088{{±|1.596|1.207}}
| eccentricity = 0.039{{±|0.005|0.013}}
| inclination = 98.016{{±|16.025|24.235}}
}}
{{Orbitbox end}}
See also
References
{{reflist|refs=
{{Cite Gaia DR3|4774301387290235136}}
{{cite simbad | title=HD 30177 | access-date=2020-08-22 }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
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| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 }}
| title=Gaia Data Release 2. The catalogue of radial velocity standard stars
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| last7=Sartoretti | first7=P. | last8=Katz | first8=D.
| last9=Le Campion | first9=J. -F. | last10=Marchal | first10=O.
| last11=Hestroffer | first11=D. | last12=Thévenin | first12=F.
| last13=Crifo | first13=F. | last14=Udry | first14=S.
| last15=Cropper | first15=M. | last16=Seabroke | first16=G.
| last17=Viala | first17=Y. | last18=Benson | first18=K.
| last19=Blomme | first19=R. | last20=Jean-Antoine | first20=A.
| last21=Huckle | first21=H. | last22=Smith | first22=M.
| last23=Baker | first23=S. G. | last24=Damerdji | first24=Y.
| last25=Dolding | first25=C. | last26=Frémat | first26=Y.
| last27=Gosset | first27=E. | last28=Guerrier | first28=A.
| last29=Guy | first29=L. P. | last30=Haigron | first30=R.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=616 | pages=A7 | year=2018
| bibcode=2018A&A...616A...7S | arxiv=1804.09370
| doi=10.1051/0004-6361/201832795 | s2cid=52952408 }}
| title=Exploring the realm of scaled solar system analogues with HARPS
| display-authors=1 | last1=Barbato | first1=D.
| last2=Sozzetti | first2=A. | last3=Desidera | first3=S.
| last4=Damasso | first4=M. | last5=Bonomo | first5=A. S.
| last6=Giacobbe | first6=P. | last7=Colombo | first7=L. S.
| last8=Lazzoni | first8=C. | last9=Claudi | first9=R.
| last10=Gratton | first10=R. | last11=LoCurto | first11=G.
| last12=Marzari | first12=F. | last13=Mordasini | first13=C.
| journal=Astronomy & Astrophysics
| volume=615 | id=A175 | pages=21 | date=August 2018
| arxiv=1804.08329 | bibcode=2018A&A...615A.175B
| doi=10.1051/0004-6361/201832791 | s2cid=119099721 }}
| title=AAPS Discovered Planets
| last=Tinney | first=Chris | date=2007-09-07
| website=Anglo-Australian Planet Search
| publisher=University of New South Wales
| url=http://newt.phys.unsw.edu.au/~cgt/planet/AAPS%20Planets.html
| access-date=2018-04-17 }}
| title=Revising the ages of planet-hosting stars
| last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.
| last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=575 | at=A18 | year=2015
| arxiv=1411.4302 | bibcode=2015A&A...575A..18B | bibcode-access=free
| doi=10.1051/0004-6361/201424951 | doi-access=free }}
| title=Four New Planets Orbiting Metal-enriched Stars
| last1=Tinney | first1=C. G. | last2=Butler | first2=R. Paul
| last3=Marcy | first3=Geoffrey W. | last4=Jones | first4=Hugh R. A.
| last5=Penny | first5=Alan J. | last6=McCarthy | first6=Chris
| last7=Carter | first7=Brad D. | last8=Bond | first8=Jade
| display-authors=1 | journal=The Astrophysical Journal
| volume=587 | issue=1 | pages=423–428 | year=2003
| arxiv=astro-ph/0207128 | bibcode=2003ApJ...587..423T | bibcode-access=free
| doi=10.1086/368068 | doi-access=free }}
| title=The Anglo-Australian Planet Search. XXV. A Candidate Massive Saturn Analog Orbiting HD 30177
| last1=Wittenmyer | first1=Robert A. | last2=Horner | first2=Jonathan
| last3=Mengel | first3=M. W. | last4=Butler | first4=R. P.
| last5=Wright | first5=D. J. | last6=Tinney | first6=C. G.
| last7=Carter | first7=B. D. | last8=Jones | first8=H. R. A.
| last9=Anglada-Escudé | first9=G. | last10=Bailey | first10=J.
| last11=o'Toole | first11=Simon J. | display-authors=1
| journal=The Astronomical Journal
| volume=153 | issue=4 | at=167 | year=2017
| arxiv=1612.02072 | bibcode=2017AJ....153..167W | bibcode-access=free
| doi=10.3847/1538-3881/aa5f17 | doi-access=free }}
| title=3D Selection of 167 Substellar Companions to Nearby Stars
| last1=Feng | first1=Fabo | last2=Butler | first2=R. Paul | display-authors=etal
| journal=The Astrophysical Journal Supplement Series
| volume=262 | issue=21 | page=21 | date=August 2022
| doi=10.3847/1538-4365/ac7e57 | doi-access=free | arxiv=2208.12720
| bibcode=2022ApJS..262...21F | s2cid=251864022 }}
| title=Catalog of Nearby Exoplanets
| 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
| journal=The Astrophysical Journal
| volume=646 | issue=1 | pages=505–522 | year=2006
| arxiv=astro-ph/0607493 | bibcode=2006ApJ...646..505B
| doi=10.1086/504701 | s2cid=119067572 }}
| title=University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars. Declinations −90° to −53°
| last1=Houk | first1=Nancy | last2=Cowley | first2=Anne P.
| publisher=Department of Astronomy, University of Michigan
| year=1975 | volume=1
| isbn=978-0-8357-0331-4 | bibcode=1975mcts.book.....H }}
}}
External links
- {{cite encyclopedia
| title=Notes for star HD 30177
| encyclopedia=Extrasolar Planets Encyclopaedia
| url=http://exoplanet.eu/star.php?st=HD+30177
| archive-url=https://web.archive.org/web/20070702190654/http://exoplanet.eu/star.php?st=HD+30177
| url-status=dead | archive-date=July 2, 2007
| access-date=2008-08-29 }}
{{Sky|04|41|54.3731|-|58|01|14.725|178.4}}
{{Stars of Dorado}}
{{DEFAULTSORT:HD 30177}}
Category:G-type main-sequence stars
Category:Planetary systems with two confirmed planets