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{{Short description|Star in the constellation Leo}} |
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{{Starbox short |
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{{Starbox begin}} |
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| name = HD 81040 |
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{{Starbox observe |
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| epoch = J2000 |
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| epoch = J2000 |
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| constell = [[Leo (constellation)|Leo]] |
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| constell = [[Leo (constellation)|Leo]] |
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| ra = 09<sup>h</sup> 23<sup>m</sup> 47.0873<sup>s</sup> |
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| ra = {{RA|09|23|47.08737}}<ref name=GaiaDR3/> |
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| dec = +20° 21' 52.034" |
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| dec = {{DEC|+20|21|52.0349}}<ref name=GaiaDR3/> |
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| appmag_v = +7.74 |
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| appmag_v = +7.73<ref name=Earle2017/> |
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| dist_ly = 106.2 |
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| dist_pc = 32.56 |
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| spectral = G2/G3 |
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| names = BD+20°2374, FK5 4836, GC 12951, HIP 46070, SAO 80800 |
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| Simbad = HD+81040 |
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}} |
}} |
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{{Starbox character |
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'''HD 81040''' is a [[star]] in the [[constellation]] of [[Leo (constellation)|Leo]]. It is G-type [[yellow dwarf]] like our [[Sun]]. |
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| type = |
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| class = G0V<ref name=Earle2017/> |
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| b-v = {{Val|0.680|0.012}} |
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| u-b = |
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| variable = |
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}} |
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{{Starbox astrometry |
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| radial_v = {{Val|+49.270|0.0017}}<ref name=Soubiran2018/> |
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| prop_mo_ra = {{val|-151.265|0.045}} |
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| prop_mo_dec = {{val|35.708|0.036}} |
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| pm_footnote = <ref name=GaiaDR3/> |
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| parallax = 29.0635 |
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| p_error = 0.0414 |
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| parallax_footnote = <ref name=GaiaDR3/> |
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| absmag_v = 5.12<ref name=Anderson2012/> |
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}} |
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{{Starbox detail |
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| source = |
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| mass = {{val|0.962|0.040}}<ref name="Winn2022"/> |
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| radius = {{Val|0.91|0.01|0.03}}<ref name=GaiaDR2>{{Cite Gaia DR2|637329067477530368}}</ref> |
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| luminosity = {{val|0.838|0.018}}<ref name="Li2021"/> |
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| gravity = 4.48<ref name=Earle2017/> |
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| temperature = 5,753<ref name=Earle2017/> |
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| metal_fe = {{Val|−0.06|0.03}}<ref name=Anderson2012/> |
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| rotation = {{val|15.98|ul=d}}<ref name="Li2021"/> |
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| rotational_velocity = 5.3<ref name=Earle2017/> |
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| age_gyr = {{val|1.79|0.30|0.26}}<ref name="Li2021"/> |
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}} |
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{{Starbox catalog |
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| names = {{odlist | BD=+20°2374 | FK5=4836 | GC=12951 | HD=81040 | HIP=46076 | PPM=99541 | SAO=80800 }}<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
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| Simbad = HD+81040 |
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}} |
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{{End}} |
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'''HD 81040''' is a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Leo (constellation)|Leo]]. With an [[apparent visual magnitude]] of +7.73<ref name=Earle2017/> it is too dim to be visible to the naked eye but can be viewed with a small telescope. The star is located at a distance of 112 [[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]]. It is drifting further away with a [[radial velocity]] of +49 km/s,<ref name=Soubiran2018/> having come to within {{Convert|14.74|pc|ly|0|disp=out|abbr=off}} some 527,000 years ago. |
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The Sun dwarfs HD 81040 in terms of physical characteristics. The age of the star is not precisely known; the [[ELODIE spectrograph]] suggested 0.8 Gyr and found it to have a young dust disk. Later measurements by modelling [[chromosphere|chromosperic]] activity suggested an age of 4.18 Gyr. |
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== Properties == |
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This is an ordinary [[G-type main-sequence star]] with a [[stellar classification]] of G0V.<ref name=Earle2017/> The Sun somewhat dwarfs HD 81040 in terms of physical characteristics: it has 87% of the [[Sun's mass]] and 91% of the [[radius of the Sun]]. It is spinning with a [[projected rotational velocity]] of 5.3 km/s,<ref name=Earle2017/> and has near solar [[metallicity]].<ref name=Anderson2012/> The age of the star is not precisely known; the [[ELODIE spectrograph]] suggested 0.8 Gyr and found it to have a young [[debris disk|dust disk]].<ref name="Sozzetti2006"/> Later measurements by modelling [[chromosphere|chromosperic]] activity suggested an age of 4.18 Gyr.{{cn|date=July 2020}} |
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__NOTOC__ |
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== Planetary system == |
== Planetary system == |
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On November 24, 2005, a [[superjovian]] [[planet]] was announced by Sozzetti et al.<ref name="Sozzetti2006"/> It was discovered using the radial velocity method. [[Astrometry|Astrometric]] measurements using ''[[Gaia (spacecraft)|Gaia]]'', published in several papers, show that the inclination of its orbit is about 111 degrees, so its true mass is somewhat higher than that predicted from its [[minimum mass]].<ref name=Li2021/><ref name="Winn2022"/> |
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On November 24, 2005, a [[superjovian]] [[planet]] was announced by Sozzetti. |
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{{OrbitboxPlanet begin |
{{OrbitboxPlanet begin |
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| table_ref = <ref name="Li2021"/><ref name="Winn2022"/> |
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| table_ref = <ref>{{cite journal | url=http://www.aanda.org/articles/aa/abs/2006/13/aa4303-05/aa4303-05.html | author=Sozzetti ''et al.'' | title=A massive planet to the young disc star HD 81040 | journal=[[Astronomy and Astrophysics]] | volume=449 | issue=1 | year=2006 | pages=417–424 | format=abstract | doi=10.1051/0004-6361:20054303 | last2=Udry | first2=S. | last3=Zucker | first3=S. | last4=Torres | first4=G. | last5=Beuzit | first5=J. L. | last6=Latham | first6=D. W. | last7=Mayor | first7=M. | last8=Mazeh | first8=T. | last9=Naef | first9=D. | bibcode=2006A&A...449..417S|arxiv = astro-ph/0511679 }}([http://arxiv.org/abs/astro-ph/0511679 web preprint])</ref>}} |
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}} |
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{{OrbitboxPlanet |
{{OrbitboxPlanet |
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| exoplanet = [[HD 81040 b|b]] |
| exoplanet = [[HD 81040 b|b]] |
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| mass |
| mass = {{val|7.53|0.032}} |
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| period = |
| period = {{val|1004.7|3.0|fmt=commas}} |
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| semimajor = 1. |
| semimajor = {{val|1.946|0.014}} |
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| eccentricity = 0. |
| eccentricity = {{val|0.525|0.024|0.026}} |
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| inclination = {{val|111.4|4.4|4.7}} |
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}} |
}} |
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{{Orbitbox end}} |
{{Orbitbox end}} |
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== See also == |
== See also == |
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* [[List of extrasolar planets]] |
* [[List of extrasolar planets]] |
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* [[List of stars in Leo]] |
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==References== |
==References== |
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{{Reflist|refs= |
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{{reflist}} |
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<ref name=GaiaDR3>{{Cite Gaia DR3|637329067477530368}}</ref> |
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<ref name=SIMBAD>{{cite simbad | title=HD 81040 | access-date=2018-07-13}}</ref> |
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<ref name=Anderson2012>{{cite journal |
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| title=XHIP: An extended hipparcos compilation |
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| last1=Anderson | first1=E. | last2=Francis | first2=Ch. |
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| journal=Astronomy Letters | arxiv=1108.4971 |
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| volume=38 | issue=5 | pages=331 | year=2012 |
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| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref> |
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<ref name=Soubiran2018>{{cite journal |
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| last1=Soubiran | first1=C. | last2=Jasniewicz | first2=G. |
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| last3=Chemin | first3=L. | last4=Zurbach | first4=C. |
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| last5=Brouillet | first5=N. | last6=Panuzzo | first6=P. |
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| last7=Sartoretti | first7=P. | last8=Katz | first8=D. |
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| last9=Le Campion | first9=J. -F. | last10=Marchal | first10=O. |
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| last11=Hestroffer | first11=D. | last12=Thévenin | first12=F. |
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| last13=Crifo | first13=F. | last14=Udry | first14=S. |
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| last15=Cropper | first15=M. | last16=Seabroke | first16=G. |
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| last17=Viala | first17=Y. | last18=Benson | first18=K. |
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| last19=Blomme | first19=R. | last20=Jean-Antoine | first20=A. |
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| last21=Huckle | first21=H. | last22=Smith | first22=M. |
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| last23=Baker | first23=S. G. | last24=Damerdji | first24=Y. |
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| last25=Dolding | first25=C. | last26=Frémat | first26=Y. |
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| last27=Gosset | first27=E. | last28=Guerrier | first28=A. |
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| last29=Guy | first29=L. P. | last30=Haigron | first30=R. |
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| display-authors=1 | journal=Astronomy and Astrophysics |
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| title=Gaia Data Release 2. The catalogue of radial velocity standard stars |
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| volume=616 | pages=A7 | year=2018 |
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| arxiv=1804.09370 | doi=10.1051/0004-6361/201832795 |
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| bibcode=2018A&A...616A...7S | s2cid=52952408 }}</ref> |
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<ref name=Earle2017>{{cite journal |
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| title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants |
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| last1=Luck | first1=R. Earle |
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| journal=The Astronomical Journal |
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| volume=153 | issue=1 | id=21 | pages=19 | date=January 2017 |
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| bibcode=2017AJ....153...21L | arxiv=1611.02897 |
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| doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | doi-access=free }}</ref> |
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<ref name="Sozzetti2006">{{cite journal |
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| title=A massive planet to the young disc star HD 81040 |
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| url=http://www.aanda.org/articles/aa/full/2006/13/aa4303-05/aa4303-05.html |
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| last1=Sozzetti | first1=A. | last2=Udry | first2=S. |
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| last3=Zucker | first3=S. | last4=Torres | first4=G. |
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| last5=Beuzit | first5=J. L. | last6=Latham | first6=D. W. |
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| last7=Mayor | first7=M. | last8=Mazeh | first8=T. |
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| last9=Naef | first9=D. | last10=Perrier | first10=C. |
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| last11=Queloz | first11=D. | last12=Sivan | first12=J.-P. |
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| display-authors=1 | journal=Astronomy and Astrophysics |
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| volume=449 | issue=1 | pages=417–424 | date=2006 |
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| arxiv=astro-ph/0511679 | bibcode=2006A&A...449..417S |
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| doi=10.1051/0004-6361:20054303 | s2cid=7647622 |
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}}</ref> |
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<ref name=Li2021>{{cite journal|doi=10.3847/1538-3881/ac27ab|title=Precise Masses and Orbits for Nine Radial-velocity Exoplanets|year=2021|last1=Li|first1=Yiting|last2=Brandt|first2=Timothy D.|last3=Brandt|first3=G. Mirek|last4=Dupuy|first4=Trent J.|last5=Michalik|first5=Daniel|last6=Jensen-Clem|first6=Rebecca|last7=Zeng|first7=Yunlin|last8=Faherty|first8=Jacqueline|last9=Mitra|first9=Elena L.|journal=The Astronomical Journal|volume=162|issue=6|page=266|arxiv=2109.10422|bibcode=2021AJ....162..266L|s2cid=237592581 |doi-access=free }}</ref> |
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<ref name="Winn2022">{{cite journal |last=Winn |first=Joshua N. |arxiv=2209.05516 |title=Joint Constraints on Exoplanetary Orbits from Gaia DR3 and Doppler Data |journal=The Astronomical Journal |date=September 2022|volume=164 |issue=5 |page=196 |doi=10.3847/1538-3881/ac9126 |bibcode=2022AJ....164..196W |s2cid=252211643 |doi-access=free }}</ref> |
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}} |
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== External links == |
== External links == |
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* [http://exoplanet.eu/star.php?st=HD+81040 '''The Extrasolar Planets Encyclopaedia:''' HD 81040] |
* [https://web.archive.org/web/20071106060157/http://exoplanet.eu/star.php?st=HD+81040 '''The Extrasolar Planets Encyclopaedia:''' HD 81040] |
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{{Sky|09|23|47.0873|+|20|21|52.034|106.2}} |
{{Sky|09|23|47.0873|+|20|21|52.034|106.2}} |
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{{Stars of Leo}} |
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{{DEFAULTSORT:HD 81040}} |
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[[Category:G-type main-sequence stars]] |
[[Category:G-type main-sequence stars]] |
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[[Category: |
[[Category:Planetary systems with one confirmed planet]] |
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[[Category: |
[[Category:Circumstellar disks]] |
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[[Category:Leo (constellation)]] |
[[Category:Leo (constellation)]] |
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[[Category: |
[[Category:Durchmusterung objects]] |
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[[Category:Henry Draper Catalogue objects|081040]] |
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[[Category:Hipparcos objects|046070]] |
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{{main-star-stub}} |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Leo |
Right ascension | 09h23m 47.08737s[1] |
Declination | +20° 21′ 52.0349″[1] |
Apparent magnitude (V) | +7.73[2] |
Characteristics | |
Spectral type | G0V[2] |
B−V color index | 0.680±0.012 |
Astrometry | |
Radial velocity (Rv) | +49.270±0.0017[3] km/s |
Proper motion (μ) | RA: −151.265±0.045 mas/yr[1] Dec.: 35.708±0.036 mas/yr[1] |
Parallax (π) | 29.0635 ± 0.0414 mas[1] |
Distance | 112.2 ± 0.2 ly (34.41 ± 0.05 pc) |
Absolute magnitude (MV) | 5.12[4] |
Details | |
Mass | 0.962±0.040[5] M☉ |
Radius | 0.91+0.01 −0.03[6] R☉ |
Luminosity | 0.838±0.018[7] L☉ |
Surface gravity (log g) | 4.48[2] cgs |
Temperature | 5,753[2] K |
Metallicity [Fe/H] | −0.06±0.03[4] dex |
Rotation | 15.98 d[7] |
Rotational velocity (v sin i) | 5.3[2] km/s |
Age | 1.79+0.30 −0.26[7] Gyr |
Other designations | |
BD+20°2374, FK5 4836, GC 12951, HD 81040, HIP 46076, SAO 80800, PPM 99541[8] | |
Database references | |
SIMBAD | data |
HD 81040 is a star in the equatorial constellationofLeo. With an apparent visual magnitude of +7.73[2] it is too dim to be visible to the naked eye but can be viewed with a small telescope. The star is located at a distance of 112 light years from the Sun based on parallax. It is drifting further away with a radial velocity of +49 km/s,[3] having come to within 48 light-years some 527,000 years ago.
This is an ordinary G-type main-sequence star with a stellar classification of G0V.[2] The Sun somewhat dwarfs HD 81040 in terms of physical characteristics: it has 87% of the Sun's mass and 91% of the radius of the Sun. It is spinning with a projected rotational velocity of 5.3 km/s,[2] and has near solar metallicity.[4] The age of the star is not precisely known; the ELODIE spectrograph suggested 0.8 Gyr and found it to have a young dust disk.[9] Later measurements by modelling chromosperic activity suggested an age of 4.18 Gyr.[citation needed]
On November 24, 2005, a superjovian planet was announced by Sozzetti et al.[9] It was discovered using the radial velocity method. Astrometric measurements using Gaia, published in several papers, show that the inclination of its orbit is about 111 degrees, so its true mass is somewhat higher than that predicted from its minimum mass.[7][5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 7.53±0.032 MJ | 1.946±0.014 | 1,004.7±3.0 | 0.525+0.024 −0.026 |
111.4+4.4 −4.7° |
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