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| epoch = J2000 | epoch = J2000
| constell = ]<ref name="Roman1987"/> | constell = ]<ref name="Roman1987"/>
| ra = {{RA|11|29|20.3918}}<ref name="Gaia DR2"/> | ra = {{RA|11|29|20.39171}}<ref name="GaiaDR3"/>
| dec = {{DEC|-01|27|17.280}}<ref name="Gaia DR2"/> | dec = {{DEC|-01|27|17.2817}}<ref name="GaiaDR3"/>
| appmag_v = {{val|12.168|0.009}}<ref name="APASS DR9"/> | appmag_v = {{val|12.168|0.009}}<ref name="APASS DR9"/>
}} }}
{{Starbox character {{Starbox character
| class = M0V<ref name="nasa">{{cite web | class = M0V<ref name="nasa" />
⚫ | url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-3&type=PLANET_HOST
⚫ | title=K2-3 PLANET HOST OVERVIEW PAGE
⚫ | work=NASA Exoplanet Archive
⚫ | access-date=2015-10-17
⚫ }}</ref>
| b-v = 1.35 ± 0.06<ref name="nasa" /> | b-v = 1.35 ± 0.06<ref name="nasa" />
}} }}
{{Starbox astrometry {{Starbox astrometry
| radial_v = {{val|32.6|1}}<ref name="Crossfield2015"/> | radial_v = {{val|30.24|0.46}}<ref name="GaiaDR3"/>
| prop_mo_ra = {{val|94.034|0.094}}<ref name="Gaia DR2"/> | prop_mo_ra = {{val|94.116}}
| prop_mo_dec = {{val|−78.139|0.057}}<ref name="Gaia DR2"/> | prop_mo_dec = {{val|−78.003}}
⚫ | pm_footnote = <ref name="GaiaDR3"/>
| parallax = 22.6610
| p_error = 0.0553 | parallax = 22.7374
| p_error = 0.0220
⚫ | parallax_footnote = <ref name="Gaia DR2"/>
| parallax_footnote = <ref name="GaiaDR3"/>
| absmag_v = | absmag_v =
}} }}
{{Starbox detail {{Starbox detail
| mass = 0.601 ± 0.089<ref name="nasa" /> | source = <ref name="Diamond-Lowe2022"/>
| mass = {{val|0.549|0.029|0.027}}
| radius = 0.561 ± 0.068<ref name="nasa" />
| temperature = {{val|3835|70}}<ref name="Damasso2018"/> | radius = {{val|0.546|0.018|0.016}}
| metal_fe = {{val|−0.01|0.09}}<ref name="Damasso2018"/> | luminosity_bolometric = {{val|0.0587|0.0018|0.0019}}
| gravity = {{val|4.704|0.023|0.026}}
| temperature = {{val|3844|61|63}}
| metal_fe = {{val|−0.157|0.075|0.080}}
| rotation = {{val|40|2|u=days}}<ref name="Kosiarek2019"/> | rotation = {{val|40|2|u=days}}<ref name="Kosiarek2019"/>
| age_gyr = ≥1<ref name="Crossfield2015"/> | age_gyr = {{val|6.9|4.7}}
}} }}
{{Starbox catalog {{Starbox catalog
| names = {{odlist | 2MASS=J11292037-0127173 | EPIC=201367065 | WISE=J112920.45-012718.0}} | names = {{odlist | 2MASS=J11292037-0127173 | EPIC=201367065 | Gaia DR3=3796690380302214272 | WISE=J112920.45-012718.0}}<ref name="Simbad"/>
}} }}
{{Starbox reference {{Starbox reference
Line 44: Line 43:
{{Starbox end}} {{Starbox end}}


'''K2-3''', also known as '''EPIC 201367065''',<ref name="nasa" /> is a ] with three known planets. All are ], and the outermost is in the ].<ref></ref> It is on the borderline of being a late ]/] star, but because of its temperature, it is classified as a ] (4,000 K is typically the division line between spectral class M and K). '''K2-3''', also known as '''EPIC 201367065''',<ref name="nasa" /> is a ] star with three known planets. It is on the borderline of being a late ]/] star, but because of its temperature, it is classified as a ] (4,000 K is typically the division line between spectral class M and K).


At a distance of about 144 light-years,<ref name="Gaia DR2"/> the star ranks among the top 10 nearest stars known to have transiting planets. The star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life. At a distance of {{convert|143|ly|pc|lk=on|abbr=off}},<ref name="GaiaDR3"/> the star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life.
<!--
:"A paper describing the find by astronomers at the University of Arizona, UC Berkeley, University of Hawaii, Manoa, and other institutions has been submitted to Astrophysical Journal and is freely available on the arXiv website.

:"The three planets are 2.1, 1.7 and 1.5 times the size of Earth. The outermost planet, at 1.5 Earth radii, is the smallest of the bunch and orbits far enough from its host star that it receives levels of light from its star similar to those received by Earth from the sun, said UC Berkeley graduate student Erik Petigura, who discovered the planets Jan. 6 while conducting a computer analysis of the Kepler data NASA has made available to astronomers. He calculated that the three planets receive 10.5, 3.2, and 1.4 times the light intensity of Earth.

:"'Most planets we have found to date are scorched. This system is the closest star with lukewarm transiting planets,' Petigura said. 'There is a very real possibility that the outermost planet is rocky like Earth, which means this planet could have the right temperature to support liquid water oceans.'"<ref></ref>
-->


==Planetary system== ==Planetary system==
K2-3 has at least three confirmed ]s, discovered in 2015<ref name="Crossfield2015"/> K2-3 has three confirmed ]s, discovered in 2015.<ref name="Crossfield2015"/> All are low-density ]s or ], with the outermost orbiting near the inner edge of the ].<ref name="Damasso2018"/><ref name="Diamond-Lowe2022"/>


{{OrbitboxPlanet begin {{OrbitboxPlanet begin
| table_ref = <ref name="nasa"/><ref name="Damasso2018"/> | table_ref = <ref name="Diamond-Lowe2022"/><ref name="Bonomo2023"/>
}} }}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass_earth = {{val|6.6|1.1}} | mass_earth = {{val|5.11|0.65|0.64}}
| semimajor = {{val|0.0777|0.0024|0.0026}} | semimajor = {{val|0.0778|0.0026}}
| period = {{val|10.05454|0.00003}} | period = {{val|10.054626|(0)}}
| eccentricity = 0.06 ± 0.06 | eccentricity = <0.094
| inclination = {{val|89.59|+0.24|−0.40}} | inclination = {{val|89.588|0.12|0.100}}
| radius_earth = {{val|2.29|0.23}} | radius_earth = {{val|2.078|0.076|0.067}}
}} }}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass_earth = {{val|3.1|1.3|1.2}} | mass_earth = {{val|2.68|0.85}}
| semimajor = {{val|0.1413|0.0044|0.0047}} | semimajor = {{val|0.1414|0.0047}}
| period = {{val|24.64638|0.00017}} | period = {{val|24.646582|(39)}}
| eccentricity = 0.04 ± 0.04 | eccentricity = <0.095
| inclination = 89.70 ± 0.20 | inclination = {{val|89.905|0.066|0.088}}
| radius_earth = {{val|1.77|0.18}} | radius_earth = {{val|1.582|0.057|0.051}}
}} }}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass_earth = {{val|2.7|1.2|0.8}} | mass_earth = <1.6
| semimajor = {{val|0.2097|0.0065|0.0070}} | semimajor = {{val|0.2097|0.0070}}
| period = {{val|44.55764|0.00042}} | period = {{val|44.556456|(97)}}
| eccentricity = 0.045 ± 0.045 | eccentricity = <0.097
| inclination = 89.79 ± 0.15 | inclination = {{val|89.788|0.033|0.029}}
| radius_earth = {{val|1.65|0.17}} | radius_earth = {{val|1.458|0.056|0.051}}
}} }}
{{Orbitbox end}} {{Orbitbox end}}
Line 92: Line 84:
==References== ==References==
{{reflist|refs= {{reflist|refs=

⚫ <ref name="GaiaDR3">{{Cite Gaia DR3|3796690380302214272}}</ref>

<ref name="nasa">{{cite web
⚫ | url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-3&type=PLANET_HOST
⚫ | title=K2-3 PLANET HOST OVERVIEW PAGE
⚫ | work=NASA Exoplanet Archive
⚫ | access-date=2015-10-17
⚫ }}</ref>


<ref name="APASS DR9">{{cite journal | title=VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016) | last1=Henden | first1=A. A. | last2=Templeton | first2=M. | last3=Terrell | first3=D. | last4=Smith | first4=T. C. | last5=Levine | first5=S. | last6=Welch | first6=D. | display-authors=1 | journal=VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H | volume=2336 | year=2016 | bibcode=2016yCat.2336....0H }}</ref> <ref name="APASS DR9">{{cite journal | title=VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016) | last1=Henden | first1=A. A. | last2=Templeton | first2=M. | last3=Terrell | first3=D. | last4=Smith | first4=T. C. | last5=Levine | first5=S. | last6=Welch | first6=D. | display-authors=1 | journal=VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H | volume=2336 | year=2016 | bibcode=2016yCat.2336....0H }}</ref>


<ref name="Bonomo2023">{{cite journal |last1=Bonomo |first1=A. S. |last2=Dumusque |first2=X. |display-authors=etal |date=April 2023 |title=Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems |journal=] |volume= |issue= |pages= |doi= 10.1051/0004-6361/202346211|arxiv=2304.05773|s2cid=261556620 }}</ref>
<ref name="Crossfield2015">{{cite journal | title=A Nearby M Star with Three Transiting Super-Earths Discovered by K2 | last1=Crossfield | first1=Ian J. M. | last2=Petigura | first2=Erik | last3=Schlieder | first3=Joshua E. | last4=Howard | first4=Andrew W. | last5=Fulton | first5=B. J. | last6=Aller | first6=Kimberly M. | last7=Ciardi | first7=David R. | last8=Lépine | first8=Sébastien | last9=Barclay | first9=Thomas | last10=Pater | first10=Imke de | last11=Kleer | first11=Katherine de | last12=Quintana | first12=Elisa V. | last13=Christiansen | first13=Jessie L. | last14=Schlafly | first14=Eddie | last15=Kaltenegger | first15=Lisa | last16=Crepp | first16=Justin R. | last17=Henning | first17=Thomas | last18=Obermeier | first18=Christian | last19=Deacon | first19=Niall | last20=Weiss | first20=Lauren M. | last21=Isaacson | first21=Howard T. | last22=Hansen | first22=Brad M. S. | last23=Liu | first23=Michael C. | last24=Greene | first24=Tom | last25=Howell | first25=Steve B. | last26=Barman | first26=Travis | last27=Mordasini | first27=Christoph | display-authors=1 | journal=The Astrophysical Journal | volume=804 | issue=1 | at=10 | year=2015 | arxiv=1501.03798 | bibcode=2015ApJ...804...10C | doi=10.1088/0004-637X/804/1/10 | doi-access=free }}</ref>


<ref name="Damasso2018">{{cite journal | title=Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS | url=https://www.aanda.org/articles/aa/full_html/2018/07/aa32459-17/aa32459-17.html | last1=Damasso | first1=M. | last2=Bonomo | first2=A. S. | last3=Astudillo-Defru | first3=N. | last4=Bonfils | first4=X. | last5=Malavolta | first5=L. | last6=Sozzetti | first6=A. | last7=Lopez | first7=E. | last8=Zeng | first8=L. | last9=Haywood | first9=R. D. | last10=Irwin | first10=J. M. | last11=Mortier | first11=A. | last12=Vanderburg | first12=A. | last13=Maldonado | first13=J. | last14=Lanza | first14=A. F. | last15=Affer | first15=L. | last16=Almenara | first16=J.-M. | last17=Benatti | first17=S. | last18=Biazzo | first18=K. | last19=Bignamini | first19=A. | last20=Borsa | first20=F. | last21=Bouchy | first21=F. | last22=Buchhave | first22=L. A. | last23=Cameron | first23=A. C. | last24=Carleo | first24=I. | last25=Charbonneau | first25=D. | last26=Claudi | first26=R. | last27=Cosentino | first27=R. | last28=Covino | first28=E. | last29=Delfosse | first29=X. | last30=Desidera | first30=S. | display-authors=1 | journal=Astronomy and Astrophysics | volume=615 | at=A69 | year=2018 | arxiv=1802.08320 | bibcode=2018A&A...615A..69D | doi=10.1051/0004-6361/201732459 | s2cid=58923147 }}</ref> <ref name="Crossfield2015">{{cite journal | title=A Nearby M Star with Three Transiting Super-Earths Discovered by K2 | last1=Crossfield | first1=Ian J. M. | last2=Petigura | first2=Erik | last3=Schlieder | first3=Joshua E. | last4=Howard | first4=Andrew W. | last5=Fulton | first5=B. J. | last6=Aller | first6=Kimberly M. | last7=Ciardi | first7=David R. | last8=Lépine | first8=Sébastien | last9=Barclay | first9=Thomas | last10=Pater | first10=Imke de | last11=Kleer | first11=Katherine de | last12=Quintana | first12=Elisa V. | last13=Christiansen | first13=Jessie L. | last14=Schlafly | first14=Eddie | last15=Kaltenegger | first15=Lisa | last16=Crepp | first16=Justin R. | last17=Henning | first17=Thomas | last18=Obermeier | first18=Christian | last19=Deacon | first19=Niall | last20=Weiss | first20=Lauren M. | last21=Isaacson | first21=Howard T. | last22=Hansen | first22=Brad M. S. | last23=Liu | first23=Michael C. | last24=Greene | first24=Tom | last25=Howell | first25=Steve B. | last26=Barman | first26=Travis | last27=Mordasini | first27=Christoph | display-authors=1 | journal=The Astrophysical Journal | volume=804 | issue=1 | article-number=10 | year=2015 | page=<!-- to prevent citation bot adding nonexistent page number--> | arxiv=1501.03798 | bibcode=2015ApJ...804...10C | bibcode-access=free | doi=10.1088/0004-637X/804/1/10 | doi-access=free }}</ref>


<ref name="Damasso2018">{{cite journal | title=Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS |last1=Damasso |first1=Mario |last2=Bonomo |first2=Aldo Stefano |last3=Astudillo-Defru |first3=Nicola |last4=Bonfils |first4=Xavier |last5=Malavolta |first5=Luca |last6=Sozzetti |first6=Alessandro |last7=Lopez |first7=Eric D. |last8=Zeng |first8=Li |last9=Haywood |first9=Raphaëlle D. | last10=Irwin |first10=Jonathan M. |last11=Mortier |first11=Annelies |last12=Vanderburg |first12=Andrew |last13=Maldonado |first13=Jesus |last14=Lanza |first14=Antonino Francesco |last15=Affer |first15=Laura |last16=Almenara |first16=José M. |last17=Benatti |first17=Serena |last18=Biazzo |first18=Katia |last19=Bignamini |first19=Andrea |last20=Borsa |first20=Francesco |last21=Bouchy |first21=François |last22=Buchhave |first22=Lars A. |last23=Cameron |first23=Andrew C.<!-- Collier --> |last24=Carleo |first24=Ilaria |last25=Charbonneau |first25=David |last26=Claudi |first26=Riccardo |last27=Cosentino |first27=Rosario |last28=Covino |first28=Elvira |last29=Delfosse |first29=Xavier |last30=Desidera |first30=Silvano |display-authors=1 <!-- L. Di Fabrizio, Courtney D. Dressing, M. Esposito, R. Fares, Pedro Figueira, A. F. M. Fiorenzano, Thierry Forveille, P. Giacobbe, E. González-Álvarez, R. Gratton, A. Harutyunyan, J. Asher Johnson, David W. Latham, G. Leto, M. Lopez-Morales, Christophe Lovis, A. Maggio, L. Mancini, S. Masiero, Michel Mayor, G. Micela, E. Molinari, F. Motalebi, Felipe Murgas, V. Nascimbeni, I. Pagano, Francesco Pepe, D. F. Phillips, G. Piotto, E. Poretti, M. Rainer, K. Rice, Nuno C. Santos, D. Sasselov, G. Scandariato, Damien Ségransan, R. Smareglia, Stéphane Udry, C. Watson, and Anaël Wünsche -->|journal=Astronomy and Astrophysics |volume=615 | article-number=A69 | year=2018 | pages=<!-- to prevent citation bot adding nonexistent page number--> | arxiv=1802.08320 | bibcode=2018A&A...615A..69D | bibcode-access=free | doi=10.1051/0004-6361/201732459 | doi-access=free | s2cid=58923147 }}</ref>
⚫ <ref name="Gaia DR2">{{Cite DR2|3796690380302214272}}</ref>


<ref name="Kosiarek2019">{{cite journal |doi=10.3847/1538-3881/aaf79c |arxiv=1812.08241 |title=Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, and d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits |year=2019 |last1=Kosiarek |first1=Molly R. |last2=Crossfield |first2=Ian J. M. |last3=Hardegree-Ullman |first3=Kevin K. |last4=Livingston |first4=John H. |last5=Benneke |first5=Björn |last6=Henry |first6=Gregory W. |last7=Howard |first7=Ward S. |last8=Berardo |first8=David |last9=Blunt |first9=Sarah |last10=Fulton |first10=Benjamin J. |last11=Hirsch |first11=Lea A. |last12=Howard |first12=Andrew W. |last13=Isaacson |first13=Howard |last14=Petigura |first14=Erik A. |last15=Sinukoff |first15=Evan |last16=Weiss |first16=Lauren |last17=Bonfils |first17=Xavier |last18=Dressing |first18=Courtney D. |last19=Knutson |first19=Heather A.|last20=Schlieder |first20=Joshua E. |last21=Werner |first21=Michael |last22=Gorjian |first22=Varoujan |last23=Krick |first23=Jessica |last24=Morales |first24=Farisa Y. |last25=Astudillo-Defru |first25=Nicola |last26=Almenara |first26=José M. |last27=Delfosse |first27=Xavier |last28=Forveille |first28=Thierry |last29=Lovis |first29=Christophe |last30=Mayor |first30=Michel |last31=Murgas |first31=Felipe |last32=Pepe |first32=Francesco |last33=Santos |first33=Nuno C. |last34=Udry |first34=Stéphane |last35=Corbett |first35=Henry Tillman |last36=Fors |first36=Octavi |last37=Law |last37=Nicholas M. |last38=Ratzloff |first38=Jeffrey K. |last39=del Ser |first39=Daniel |journal=The Astronomical Journal |volume=157 |issue=3 |page=97 |bibcode=2019AJ....157...97K |s2cid=119440420 }}</ref> <ref name="Diamond-Lowe2022">{{citation|arxiv=2207.12755|year=2022|title=The K2-3 System Revisited: Testing Photoevaporation and Core-powered Mass Loss with Three Small Planets Spanning the Radius Valley|doi=10.3847/1538-3881/ac7807 |last1=Diamond-Lowe |first1=Hannah |last2=Kreidberg |first2=Laura |last3=Harman |first3=C. E. |last4=Kempton |first4=Eliza M.-R. |last5=Rogers |first5=Leslie A. |last6=Joyce |first6=Simon R. G. |last7=Eastman |first7=Jason D. |last8=King |first8=George W. |last9=Kopparapu |first9=Ravi |last10=Youngblood |first10=Allison |last11=Kosiarek |first11=Molly R. |last12=Livingston |first12=John H. |last13=Hardegree-Ullman |first13=Kevin K. |last14=Crossfield |first14=Ian J. M. | display-authors=1 |journal=The Astronomical Journal |volume=164 |issue=5 |page=172 |s2cid=251067119 |bibcode=2022AJ....164..172D |doi-access=free }}</ref>
<ref name="Kosiarek2019">{{cite journal |title=Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, and d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits |year=2019 |last1=Kosiarek |first1=Molly R. |last2=Crossfield |first2=Ian J. M. |last3=Hardegree-Ullman |first3=Kevin K. |last4=Livingston |first4=John H. |last5=Benneke |first5=Björn |last6=Henry |first6=Gregory W. |last7=Howard |first7=Ward S. |last8=Berardo |first8=David |last9=Blunt |first9=Sarah |last10=Fulton |first10=Benjamin J. |last11=Hirsch |first11=Lea A. |last12=Howard |first12=Andrew W. |last13=Isaacson |first13=Howard |last14=Petigura |first14=Erik A. |last15=Sinukoff |first15=Evan |last16=Weiss |first16=Lauren |last17=Bonfils |first17=Xavier |last18=Dressing |first18=Courtney D. |last19=Knutson |first19=Heather A.|last20=Schlieder |first20=Joshua E. |last21=Werner |first21=Michael |last22=Gorjian |first22=Varoujan |last23=Krick |first23=Jessica |last24=Morales |first24=Farisa Y. |last25=Astudillo-Defru |first25=Nicola |last26=Almenara |first26=José M. |last27=Delfosse |first27=Xavier |last28=Forveille |first28=Thierry |last29=Lovis |first29=Christophe |last30=Mayor |first30=Michel |last31=Murgas |first31=Felipe |last32=Pepe |first32=Francesco |last33=Santos |first33=Nuno C. |last34=Udry |first34=Stéphane |last35=Corbett |first35=Henry Tillman |last36=Fors |first36=Octavi |last37=Law |first37=Nicholas M. |last38=Ratzloff |first38=Jeffrey K. |last39=del Ser |first39=Daniel | display-authors=1 | journal=The Astronomical Journal | volume=157 | issue=3 | page=<!-- to prevent citation bot adding nonexistent page number--> | article-number=97 | arxiv=1812.08241 | bibcode=2019AJ....157...97K | bibcode-access=free | doi=10.3847/1538-3881/aaf79c | doi-access=free | s2cid=119440420 }}</ref>


<ref name="Roman1987">{{cite journal | title=Identification of a Constellation From a Position | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | year=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 | doi-access=free }} </ref> <ref name="Roman1987">{{cite journal | title=Identification of a Constellation From a Position | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | year=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 | doi-access=free }} </ref>

<ref name="Simbad">{{cite simbad | title=K2-3 | access-date=2024-04-19 }}</ref>


}} }}
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{{DEFAULTSORT:K2-3}} {{DEFAULTSORT:K2-3}}
] ]
] ]
] ]
] ]

Latest revision as of 18:13, 19 April 2024

Red dwarf star in the constellation Leo
K2-3
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11 29 20.39171
Declination −01° 27′ 17.2817″
Apparent magnitude (V) 12.168±0.009
Characteristics
Spectral type M0V
B−V color index 1.35 ± 0.06
Astrometry
Radial velocity (Rv)30.24±0.46 km/s
Proper motion (μ) RA: 94.116 mas/yr
Dec.: −78.003 mas/yr
Parallax (π)22.7374 ± 0.0220 mas
Distance143.4 ± 0.1 ly
(43.98 ± 0.04 pc)
Details
Mass0.549+0.029
−0.027 M☉
Radius0.546+0.018
−0.016 R☉
Luminosity (bolometric)0.0587+0.0018
−0.0019 L☉
Surface gravity (log g)4.704+0.023
−0.026 cgs
Temperature3844+61
−63 K
Metallicity −0.157+0.075
−0.080 dex
Rotation40±2 d
Age6.9±4.7 Gyr
Other designations
Gaia DR3 3796690380302214272, EPIC 201367065, 2MASS J11292037-0127173, WISE J112920.45-012718.0
Database references
SIMBADdata

K2-3, also known as EPIC 201367065, is a red dwarf star with three known planets. It is on the borderline of being a late orange dwarf/K-type star, but because of its temperature, it is classified as a red dwarf (4,000 K is typically the division line between spectral class M and K).

At a distance of 143 light-years (44 parsecs), the star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life.

Planetary system

K2-3 has three confirmed exoplanets, discovered in 2015. All are low-density super-Earths or sub-Neptunes, with the outermost orbiting near the inner edge of the habitable zone.

The K2-3 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 5.11+0.65
−0.64 M🜨 		0.0778±0.0026 10.054626(0) <0.094 89.588+0.12
−0.100° 		2.078+0.076
−0.067 R🜨
c 2.68±0.85 M🜨 0.1414±0.0047 24.646582(39) <0.095 89.905+0.066
−0.088° 		1.582+0.057
−0.051 R🜨
d <1.6 M🜨 0.2097±0.0070 44.556456(97) <0.097 89.788+0.033
−0.029° 		1.458+0.056
−0.051 R🜨

References

  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H.Vizier catalog entry
  4. ^ "K2-3 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-17.
  5. ^ Diamond-Lowe, Hannah; et al. (2022), "The K2-3 System Revisited: Testing Photoevaporation and Core-powered Mass Loss with Three Small Planets Spanning the Radius Valley", The Astronomical Journal, 164 (5): 172, arXiv:2207.12755, Bibcode:2022AJ....164..172D, doi:10.3847/1538-3881/ac7807, S2CID 251067119
  6. Kosiarek, Molly R.; et al. (2019). "Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, and d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits". The Astronomical Journal. 157 (3) 97. arXiv:1812.08241. Bibcode:2019AJ....157...97K. doi:10.3847/1538-3881/aaf79c. S2CID 119440420.
  7. "K2-3". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-04-19.
  8. Crossfield, Ian J. M.; et al. (2015). "A Nearby M Star with Three Transiting Super-Earths Discovered by K2". The Astrophysical Journal. 804 (1) 10. arXiv:1501.03798. Bibcode:2015ApJ...804...10C. doi:10.1088/0004-637X/804/1/10.
  9. Damasso, Mario; et al. (2018). "Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS". Astronomy and Astrophysics. 615 A69. arXiv:1802.08320. Bibcode:2018A&A...615A..69D. doi:10.1051/0004-6361/201732459. S2CID 58923147.
  10. Bonomo, A. S.; Dumusque, X.; et al. (April 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems". Astronomy & Astrophysics. arXiv:2304.05773. doi:10.1051/0004-6361/202346211. S2CID 261556620.
K2-3 system
Stars
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2015 in space
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  • DSCOVR (weather satellite; Feb 2015)
  • Astrosat (space telescope; Sep 2015)


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