Kepler-445

{{Starbox observe

| epoch = J2000

| constell = Cygnus

| ra = {{RA|19|54|56.65923}}

| dec = {{DEC|+46|29|54.7936}}

| appmag_v = 18.19

}}

{{Starbox character

| type = Main sequence

| class = M4V

| appmag_1_passband = G

| appmag_1 = {{val|16.685|0.003}}

| appmag_2_passband = J

| appmag_2 = {{val|13.542|0.029}}

| appmag_3_passband = H

| appmag_3 = {{val|12.929|0.035}}

| appmag_4_passband = K

| appmag_4 = {{val|12.610|0.028}}

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = 41.465

| prop_mo_dec = 132.351

| pm_footnote =

| parallax = 8.1366

| p_error = 0.0457

| parallax_footnote =

| absmag_v =

| absmag_bol =

}}

{{Starbox detail

| source =

| mass = {{val|0.334|0.080|0.059}}

| radius = {{val|0.347|0.068|0.049}}

| luminosity_bolometric = 0.0115

| gravity =

| temperature = {{val|3219|89|63}}

| metal_fe = +0.27

| rotation =

| rotational_velocity =

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | 2MASS = J19545665+4629548 | Kepler = 445 | KIC = 9730163 | KOI = 2704 | TIC = 268060194}}

}}

{{Starbox reference

| Simbad = Kepler-445

| NSTED = Kepler-445

}}

Kepler-445 is a red dwarf star located {{convert|401|ly|pc|lk=on|abbr=off}} away in the constellation Cygnus. It hosts three known exoplanets, discovered by the transit method using data from the Kepler space telescope and confirmed in 2015. None of the planets orbit within the habitable zone.{{refn|"[...] all of the planets are likely too hot to be located within their host stars’ habitable zones [...]"{{rp|8}}}}

Planetary system

Kepler-445b, c, and d orbit Kepler-445 every 3, 5, and 8 days, and have equilibrium temperatures of {{convert|401|K|C F}}, {{convert|341|K|C F}}, and {{convert|305|K|C F}}, respectively. With a radius of 2.72 times that of Earth, Kepler-445c is likely a mini-Neptune with a volatile-rich composition, and has been compared to GJ 1214 b. Kepler-445d is only slightly larger than the Earth, with a radius of {{Earth radius|1.33|link=y}}.

{{Orbitbox planet begin

| name = Kepler-445

| table_ref =

}}

{{Orbitbox planet

| exoplanet = b

| mass_earth =

| radius_earth = {{val|1.74|0.29|0.28}}

| semimajor = 0.023656

| period = {{val|2.98416640|0.00000891|0.00000936}}

| eccentricity = {{val|0.02|0.16|0.02}}

| inclination = {{val|89.74|0.18|0.28}}

}}

{{Orbitbox planet

| exoplanet = c

| mass_earth =

| radius_earth = {{val|2.72|0.44|0.43}}

| semimajor = 0.033427

| period = {{val|4.87122714|0.00000636|0.00000638}}

| eccentricity = {{val|0.01|0.16|0.01}}

| inclination = {{val|89.91|0.07|0.10}}

}}

{{Orbitbox planet

| exoplanet = d

| mass_earth =

| radius_earth = {{val|1.33|0.25|0.23}}

| semimajor = 0.047121

| period = {{val|8.15272856|0.00006453|0.00007041}}

| eccentricity = {{val|0.01|0.16|0.01}}

| inclination = {{val|89.61|0.27|0.25}}

}}

References

{{Reflist|refs=

{{cite journal |bibcode=2014ApJS..213....5M |title=Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-candidate Hosts |last1=Muirhead |first1=Philip S. |last2=Becker |first2=Juliette |last3=Feiden |first3=Gregory A. |last4=Rojas-Ayala |first4=Bárbara |last5=Vanderburg |first5=Andrew |last6=Price |first6=Ellen M. |last7=Thorp |first7=Rachel |last8=Law |first8=Nicholas M. |last9=Riddle |first9=Reed |last10=Baranec |first10=Christoph |last11=Hamren |first11=Katherine |last12=Schlawin |first12=Everett |last13=Covey |first13=Kevin R. |last14=Johnson |first14=John Asher |last15=Lloyd |first15=James P. |journal=The Astrophysical Journal Supplement Series |date=2014 |volume=213 |issue=1 |page=5 |doi=10.1088/0067-0049/213/1/5 |arxiv=1406.2718 }}

{{cite journal |last1=Muirhead |first1=Philip S. |last2=Mann |first2=Andrew W. |display-authors=etal |date=March 2015 |title=Kepler-445, Kepler-446 and the Occurrence of Compact Multiples Orbiting Mid-M Dwarf Stars |journal=The Astrophysical Journal |volume=801 |issue=1 |pages=18 |doi=10.1088/0004-637X/801/1/18 |arxiv=1501.01305 |bibcode=2015ApJ...801...18M|s2cid=5541362 }}

{{cite journal|arxiv=1705.01545|title=The Gold Standard: Accurate Stellar and Planetary Parameters for Eight Kepler M Dwarf Systems Enabled by Parallaxes|year=2017|doi=10.3847/1538-3881/aa7140|last1=Mann|first1=Andrew W.|last2=Dupuy|first2=Trent|last3=Muirhead|first3=Philip S.|last4=Johnson|first4=Marshall C.|last5=Liu|first5=Michael C.|last6=Ansdell|first6=Megan|last7=Dalba|first7=Paul A.|last8=Swift|first8=Jonathan J.|last9=Hadden|first9=Sam|journal=The Astronomical Journal|volume=153|issue=6|page=267|bibcode=2017AJ....153..267M |s2cid=119325474 |doi-access=free }}

{{Cite web|url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=cumulative&constraint=koi_pdisposition+like+%27CANDIDATE%27|title=Kepler Objects of Interest}}

{{cite web |url=https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-445 |title=Kepler-445 |publisher=NASA Exoplanet Archive |access-date=24 May 2023}}

}}

Category:Cygnus (constellation)

Category:M-type main-sequence stars

Category:Planetary systems with three confirmed planets

2704

Category:Planetary transit variables

J19545665+4629548

268060194