K2-66b
{{Short description|Mega-Earth exoplanet orbiting K2-66}}
{{Use dmy dates|date=June 2021}}
{{Infobox planet
| extrasolarplanet = yes
| name = K2-66b
| image =
| image_size =
| image_alt =
| caption =
| apsis = astron
| discovery_ref ={{Cite encyclopedia|title=The Extrasolar Planet Encyclopaedia — K2-66 b|url=https://exoplanet.eu/catalog/k2_66_b--6576/|encyclopedia=Extrasolar Planets Encyclopaedia|access-date=30 January 2021}}
| discoverer =K2
| discovery_site =
| discovered = 2017
| discovery_method =Transit
| alt_names =
| periastron =
| apoastron =
| semimajor = 0.05983±0.00072 AU
| avg_speed =
| eccentricity =
| period = 5.06963±0.00081 d
| inclination = {{Val|86.6|4.4|2.4}}°
| angular_dist =
| long_periastron =
| time_periastron =
| semi-amplitude =
| star = K2-66
| mean_radius ={{Val|2.49}} {{Earth radius}}
| surface_area =
| volume =
| density = {{val|7.6|u=g/cm3}}
| mass = {{Val|0.06702}} {{Jupiter mass}}
| surface_grav =
| moment_of_inertia_factor =
| escape_velocity =
| albedo =
| single_temperature =
}}
K2-66b is a confirmed{{Cite web|title=K2-66 - Universe Guide|url=https://www.universeguide.com/star/124622/k266|access-date=2021-07-07|website=www.universeguide.com}}{{verification failed|date=August 2024}} mega-Earth orbiting the subgiant K2-66, about {{convert|520|parsec|ly}} from Earth in the direction of Aquarius. It is an extremely hot and dense planet heavier than Neptune, but with only about half its radius.{{Cite journal |doi=10.3847/1538-3881/aa725f |title=K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities |year=2017 |last1=Sinukoff |first1=Evan |last2=Howard |first2=Andrew W. |last3=Petigura |first3=Erik A. |last4=Fulton |first4=Benjamin J. |last5=Crossfield |first5=Ian J. M. |last6=Isaacson |first6=Howard |last7=Gonzales |first7=Erica |last8=Crepp |first8=Justin R. |last9=Brewer |first9=John M. |last10=Hirsch |first10=Lea |last11=Weiss |first11=Lauren M. |last12=Ciardi |first12=David R. |last13=Schlieder |first13=Joshua E. |last14=Benneke |first14=Bjoern |last15=Christiansen |first15=Jessie L. |last16=Dressing |first16=Courtney D. |last17=Hansen |first17=Brad M. S. |last18=Knutson |first18=Heather A. |last19=Kosiarek |first19=Molly |last20=Livingston |first20=John H. |last21=Greene |first21=Thomas P. |last22=Rogers |first22=Leslie A. |last23=Lépine |first23=Sébastien |journal=The Astronomical Journal |volume=153 |issue=6 |page=271 |arxiv=1705.03491 |bibcode=2017AJ....153..271S |s2cid=31572527 |doi-access=free }}
Planet properties
= Mass, radius, and temperature =
K2-66b is a mega-Earth with radius {{Earth radius|2.49}} and mass {{Earth mass|21.3}}.{{cite conference |bibcode=2018LPI....49.1224F |title=Kepler-145b and K2-66b: A Kepler- and a K2-Mega-Earth with Different Compositional Characteristics |last1=Futó |first1=P. |journal=Lunar and Planetary Science Conference |year=2018 |issue=2083 |page=1224 }} The planet's temperature is highly variable due to the variability of its host star, and is currently estimated at {{Convert|1372|K|C F}}.
= Orbit =
The planet orbits every 5.07 days at 0.06 AU. It orbits within a "photoevaporation desert", where orbiting exoplanets should be very uncommon.{{cite journal |last1=Sinukoff |first1=Evan |last2=Howard |first2=Andrew W. |last3=Petigura |first3=Erik A. |last4=Fulton |first4=Benjamin J. |last5=Crossfield |first5=Ian J. M. |last6=Isaacson |first6=Howard |last7=Gonzales |first7=Erica |last8=Crepp |first8=Justin R. |last9=Brewer |first9=John M. |last10=Hirsch |first10=Lea |last11=Weiss |first11=Lauren M. |last12=Ciardi |first12=David R. |last13=Schlieder |first13=Joshua E. |last14=Benneke |first14=Bjoern |last15=Christiansen |first15=Jessie L. |last16=Dressing |first16=Courtney D. |last17=Hansen |first17=Brad M. S. |last18=Knutson |first18=Heather A. |last19=Kosiarek |first19=Molly |last20=Livingston |first20=John H. |last21=Greene |first21=Thomas P. |last22=Rogers |first22=Leslie A. |last23=Lépine |first23=Sébastien |display-authors=1 |title=K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities |journal=The Astronomical Journal |date=31 May 2017 |volume=153 |issue=6 |pages=271 |doi=10.3847/1538-3881/aa725f |arxiv=1705.03491 |bibcode=2017AJ....153..271S |doi-access=free}} K2-66b's orbit is nearly circular.{{Cite web|title=Open Exoplanet Catalogue - K2-66 b|url=http://openexoplanetcatalogue.com/planet/K2-66%20b/|access-date=2021-06-26|website=openexoplanetcatalogue.com}}{{Cite web|title=Exoplanet-catalog|url=https://exoplanets.nasa.gov/exoplanet-catalog/3334/k2-66-b/|access-date=2021-06-25|website=Exoplanet Exploration: Planets Beyond our Solar System}}
Star
The star,{{Cite web|title=K2-66|url=http://sim-id/|access-date=2021-07-07|website=sim-id}}{{Dead link|date=February 2023 |bot=InternetArchiveBot |fix-attempted=yes }} K2-66 is a G1 sub-giant in Aquarius. It has a sun-like temperature of 5887 K, which corresponds to its spectral class and is very close to that of the [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=Kepler-130 rotationally variable]{{Cite web|title=Kepler-130|url=http://sim-id/|access-date=2021-07-07|website=sim-id}}{{Dead link|date=February 2023 |bot=InternetArchiveBot |fix-attempted=yes }} star [http://www.openexoplanetcatalogue.com/planet/Kepler-130%20b/ Kepler-130].{{Cite web|title=Kepler-130 | NASA Exoplanet Archive|url=https://exoplanetarchive.ipac.caltech.edu/overview/K00282.03}}{{Cite encyclopedia|title=The Extrasolar Planet Encyclopaedia — Kepler-130 d|url=https://exoplanet.eu/catalog/kepler_130_d--2115/|encyclopedia=Extrasolar Planets Encyclopaedia|access-date=2021-06-28}}{{Cite web|title=Open Exoplanet Catalogue - Kepler-130 d|url=http://www.openexoplanetcatalogue.com/planet/Kepler-130%20d/|access-date=2021-06-28|website=www.openexoplanetcatalogue.com}} It has a radius of {{Solar radius|1.67}} and a mass of {{Solar mass|1.11}}. Its metallicity is −0.047, and its apparent magnitude is 11.71.
See also
References
{{reflist}}
External links
- [http://www.openexoplanetcatalogue.com/planet/Kepler-130%20b/ Kepler-130]
- [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-130+&submit=SIMBAD+search SIMBAD: Kepler-130]
{{2017 in space}}
Category:Exoplanets discovered in 2017
Category:Aquarius (constellation)