Kepler-87

{{Short description|Star in Cygnus}}

{{multiple issues|

{{notability|date=October 2023}}

{{more footnotes needed|date=October 2023}}

}}

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0

| constell = Cygnus

| ra = {{RA|19|51|40.0490}}

| dec = {{DEC|+46|57|54.425}}

| appmag_v = 15

}}

{{Starbox character

| class = G4IV

| variable = planetary transit

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = {{val|−4.382|(19)}}

| prop_mo_dec = {{val|−0.821|(20)}}

| pm_footnote =

| parallax = 0.7803

| p_error = 0.0154

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = 1.01

| radius = 1.49669

| luminosity = 0.3260445

| temperature = 5692 ± 60.7121

| metal_fe = {{val|0.0562149|0.0587866}}

| age = {{val|7.24|+1.50|-1.56}}

}}

{{starbox catalog

| names = KOI-1574, 2MASS J19514005+4657544, KIC 10028792, WISE J195140.04+465754.4

}}

{{Starbox reference

| Simbad = Kepler-87

}}

{{Starbox end}}

Kepler-87 is a star slightly more massive than the Sun and it is nearing the end of its main-sequence period.{{cite web |title=Kepler-87 {{!}} NASA Exoplanet Archive |url=https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-87 |website=exoplanetarchive.ipac.caltech.edu |access-date=10 September 2023}}

== Planetary system ==

Kepler-87 hosts four planets, two confirmed (Kepler-87b,{{cite web |title=The Extrasolar Planet Encyclopaedia — Kepler-87b |url=https://exoplanet.eu/catalog/kepler_87_b--1232/ |date=1995 |work=Extrasolar Planets Encyclopaedia |access-date=10 September 2023}} Kepler-87c{{cite web |title=The Extrasolar Planet Encyclopaedia — Kepler-87c |url=https://exoplanet.eu/catalog/kepler_87_c--1233/ |date=1995 |work=Extrasolar Planets Encyclopaedia |access-date=10 September 2023}} and two unconfirmed (Kepler-87d, Kepler-87e). It is the farthest system from the Sun with two unconfirmed planet candidates at 4021 light-years.{{citation needed|date=October 2023}}

{{Orbitbox planet begin

| name = Kepler-87

| period_unit = day

}}

{{Orbitbox planet

| exoplanet = b

| mass = {{val|1.02|+0.16|-0.16}}

| period = {{val|114.73635|+0.00015|-0.00015}}

| semimajor = {{val|0.481|+0.026|-0.028}}

| eccentricity = {{val|0.036|0.009}}

}}

{{Orbitbox planet

| exoplanet = c

| mass = {{val|0.02|+0.003|-0.003}}

| period = {{val|191.2318|+0.0015|-0.0015}}

| semimajor = {{val|0.676|-0.037|-0.04}}

| eccentricity = {{val|0.039|0.012}}

}}

{{Orbitbox planet hypothetical

| exoplanet = d

| mass =

| period = {{val|5.83393857|2.241}}

| semimajor = 0.0628

| eccentricity = 0

}}

{{Orbitbox planet hypothetical

| exoplanet = e

| mass =

| period = {{val|8.9772888|0.0001451}}

| semimajor = 0.0836

| eccentricity = 0

}}

{{Orbitbox end}}