Kepler-289

{{Starbox observe

| epoch = J2000.0

| constell = Cygnus

| ra = {{RA|19|49|51.6736}}

| dec = {{DEC|+42|52|58.269}}

| appmag_v = 14.14

}}

{{Starbox character

| type = main sequence

| class = G2

| variable = planetary transit

}}

{{Starbox astrometry

| radial_v = {{val|-18.21|5.60}}

| prop_mo_ra = {{val|4.815|(14)}}

| prop_mo_dec = {{val|−0.190|(17)}}

| pm_footnote =

| parallax = 1.3763

| p_error = 0.0129

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| source =

| mass = {{val|1.08|0.02}}

| radius = {{val|1.00|0.02}}

| luminosity = {{val|1.15|0.06}}

| gravity = {{val|4.47|0.01}}

| temperature = {{val|5990|38}}

| metal_fe = {{val|0.05|0.04}}

| age_gyr = {{val|0.65|0.44}}

}}

{{starbox catalog

| names = {{odlist | name=PH3 | 2MASS=J19495168+4252582 | Kepler-289 | KIC=7303287 | KOI=1353 | TIC=273234825 | WISE=J194951.68+425258.2}}

}}

{{Starbox reference

| Simbad = Kepler-289

| NSTED = Kepler-289

}}

Kepler-289 (PH3) is a rotating variable star slightly more massive than the Sun, with a spectral type of G2, 2370 light-years away from Earth in the constellation of Cygnus. It hosts a system of multiple exoplanets.

Planetary system

Kepler-289 hosts three transiting planets, discovered using the Kepler space telescope. Two planets, Kepler-289b and Kepler-289c, were confirmed in 2014 as part of a study using statistical validation to confirm hundreds of Kepler candidates. A third planet, Kepler-289d, was found by the Planet Hunters citizen science project, hence the other designation for the system, PH3.

Different sources present conflicting models of Kepler-289's planetary system. The discovery paper for planet d says that it has an orbital period of 66 days, and that a 330-day candidate is an alias of the true period of planet d. A 2023 follow-up study also reports a 66-day period for planet d. However, a 2025 study reports a 330-day planet, and says that the 66-day signal "is no longer believed to exist in the data". The NASA Exoplanet Archive lists both a 66-day and a 330-day planet, the latter called Kepler-289e, but no literature source claims the existence of more than three planets in the system.

{{Orbitbox planet begin

| name = Kepler-289

| table_ref =

| period_unit = day

}}

{{Orbitbox planet

| exoplanet = b

| mass_earth = {{val|3.70|3.79|1.96}}

| period = {{val|34.5383|0.0006}}

| semimajor = {{val|0.21|0.01}}

| eccentricity =

| inclination = {{val|88.98|0.06|0.07}}

| radius_earth = {{val|2.49|0.07}}

}}

{{Orbitbox planet

| exoplanet = d

| mass_earth = {{val|5.33|0.43|0.42}}

| period = {{val|66.0282|0.0044|0.0039}}

| semimajor = {{val|0.33|0.02}}

| eccentricity =

| inclination = {{val|89.31|0.04}}

| radius_earth = {{val|3.03|0.08}}

}}

{{Orbitbox planet

| exoplanet = c

| mass = {{val|0.49|0.02}}

| period = {{val|125.8723|0.0035|0.0021}}

| semimajor = {{val|0.51|0.03}}

| eccentricity =

| inclination = {{val|89.78|0.04}}

| radius = {{val|1.002|0.019}}

}}

References

{{reflist|refs=

{{cite web |title=Kepler-289 {{!}} NASA Exoplanet Archive |url=https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-289 |website=exoplanetarchive.ipac.caltech.edu |access-date=10 September 2023}}

{{cite journal |last1=Rowe |first1=Jason F. |last2=Bryson |first2=Stephen T. |display-authors=etal |date=March 2014 |title=Validation of Kepler's Multiple Planet Candidates. III. Light Curve Analysis and Announcement of Hundreds of New Multi-planet Systems |journal=The Astrophysical Journal |volume=784 |issue=1 |pages=45 |doi=10.1088/0004-637X/784/1/45 |arxiv=1402.6534 |bibcode=2014ApJ...784...45R}}

{{Cite journal|last1=Schmitt|first1=Joseph R.|last2=Agol|first2=Eric|last3=Deck|first3=Katherine M.|last4=Rogers|first4=Leslie A.|last5=Gazak|first5=J. Zachary|last6=Fischer|first6=Debra A.|last7=Wang|first7=Ji|last8=Holman|first8=Matthew J.|last9=Jek|first9=Kian J.|last10=Margossian|first10=Charles|last11=Omohundro|first11=Mark R.|date=November 2014|title=Planet Hunters. VII. Discovery of a New Low-mass, Low-density Planet (PH3c) Orbiting Kepler-289 with Mass Measurements of Two Additional Planets (PH3b and d)|journal=Astrophysical Journal|language=en|volume=795|issue=2|pages=167|doi=10.1088/0004-637X/795/2/167|arxiv=1410.8114|bibcode=2014ApJ...795..167S|issn=0004-637X|hdl=1721.1/93116|s2cid=37872448|hdl-access=free}}

{{cite journal |last1=Su |first1=Tianhao |last2=Zhang |first2=Li-yun |display-authors=etal |date=August 2022 |title=Magnetic Activity and Physical Parameters of Exoplanet Host Stars Based on LAMOST DR7, TESS, Kepler, and K2 Surveys |journal=The Astrophysical Journal Supplement Series |volume=261 |issue=2 |pages=26 |doi=10.3847/1538-4365/ac7151 |doi-access=free |bibcode=2022ApJS..261...26S}}

{{cite journal |last1=Greklek-McKeon |first1=Michael |last2=Knutson |first2=Heather A. |display-authors=etal |date=February 2023 |title=Constraining the Densities of the Three Kepler-289 Planets with Transit Timing Variations |journal=The Astronomical Journal |volume=165 |issue=2 |pages=48 |doi=10.3847/1538-3881/ac8553 |doi-access=free |arxiv=2208.00022 |bibcode=2023AJ....165...48G}}

{{cite journal |last1=Ofir |first1=Aviv |last2=Yoffe |first2=Gideon |last3=Aharonson |first3=Oded |date=February 2025 |title=Planetary Mass Determinations from a Simplified Photodynamical Model—Application to the Complete Kepler Dataset |journal=The Astronomical Journal |volume=169 |issue=2 |pages=90 |doi=10.3847/1538-3881/ad91a7 |doi-access=free |arxiv=2410.11401 |bibcode=2025AJ....169...90O}}

}}

Category:Cygnus (constellation)

Category:Planetary systems with three confirmed planets

J19495168+4252582

273234825

1353

Category:G-type main-sequence stars