HD 217786#Planetary system
{{short description|Binary star system in the constellation Pisces}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Pisces
| dec = {{DEC|-00|25|46.6777}}
}}
{{Starbox character
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{val|+10.00|0.02}}
| parallax = 17.9946
| p_error = 0.0793
| absmag_v = 4.09 + {{val|11.02|0.13}}
}}
{{Starbox detail
| component1 = A
| mass = 1.02
| radius = {{val|1.32|0.06}}
| gravity = {{val|4.13|0.02}}
| luminosity = {{val|1.93|0.04}}
| temperature = {{val|5882|8|fmt=commas}}
| metal = {{val|−0.19|0.01}}
| rotational_velocity = {{val|1.18|0.05}}
| age_gyr = {{val|9.40|0.22}}
| component2 = HD 217786 B
| mass2 = {{val|0.1622|0.0071|0.0068}}
}}
{{Starbox catalog
| names = {{odlist | HD=217786 | BD=−01°4382 | GSC=05242-00591 | 2MASS=J23030822-0025465 | Gaia DR2=2650902026099857920 | HIP=113834 | TYC=5242-591-1}}
}}
{{Starbox reference
| Simbad = HD+217786
}}
{{Starbox end}}
HD 217786 is a binary star system in the equatorial constellation of Pisces. With an apparent visual magnitude of 7.78, it requires binoculars or a small telescope to view. The system is located at a distance of {{val|181|fmt=commas|u=light-years}} from the Sun based on parallax, and is drifting further away with a radial velocity of +10 km/s. Kinematically, the star system belongs to the thin disk population of the Milky Way.
The primary is an F-type main-sequence star with a stellar classification of F8V. It is much older than Sun with an estimated age of 9.4 billion years and is spinning slowly with a projected rotational velocity of 1.2 km/s. The star has a lower proportion of heavy elements than the Sun, having 65% of solar abundance. It has about the same mass as the Sun but a 32% larger radius. The star is radiating nearly double the luminosity of the Sun from its photosphere at an effective temperature of 5,882 K.
A low-mass stellar companion at a projected separation of 155 AU was discovered in 2016. The proper motion of this co-moving object suggests it is gravitationally-bound to the primary, and their orbit is being viewed edge-on. If the orbit is assumed to be circular, then the orbital period for the pair is ~6.2 Myr. No other companion stars have been detected at separations from 2.74 to 76.80 AUs.
The star system exhibits strong stellar flare activity in the ultraviolet.
Planetary system
In 2010 one superjovian planet or brown dwarf on an eccentric orbit was discovered utilising the radial velocity method. Designated component Ab, the high eccentricity of this object may have been caused by interaction with the secondary star. In 2022, the inclination and true mass of HD 217786 Ab were measured via astrometry, and a second planet was discovered orbiting closer to the star.
{{OrbitboxPlanet begin
| name = HD 217786 A
}}
{{OrbitboxPlanet
| exoplanet = c
| mass = {{val|0.023|0.002|p=≥}}
| radius =
| semimajor = {{val|0.038|0.002}}
| period = {{val|2.5|0.00010|0.00005}}
| eccentricity =
| inclination =
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = {{val|13.852|1.267|1.311}}
| radius =
| semimajor = {{val|2.446|0.109|0.119}}
| period = {{val|1301.4|1.2|0.5|fmt=commas}}
| eccentricity = {{val|0.311|0.002|0.003}}
| inclination = {{val|69.767|0.601|0.386}}
}}
{{Orbitbox end}}
References
{{reflist|refs=
{{cite simbad|title=HD 217786|accessdate = 29 September 2020}}
{{cite DR2|2650902026099857920}}
| last1=Houk | first1=N. | last2=Swift | first2=C.
| title=Michigan catalogue of two-dimensional spectral types for the HD Stars
| journal=Michigan Spectral Survey
| volume=5 | year=1999 | bibcode=1999MSS...C05....0H }}
| title=Orbital Stability of Circumstellar Planets in Binary Systems
| last1=Quarles | first1=Billy | last2=Li | first2=Gongjie
| last3=Kostov | first3=Veselin | last4=Haghighipour | first4=Nader
| journal=The Astronomical Journal
| volume=159 | issue=3 | page=80 | year=2020
| bibcode=2020AJ....159...80Q | s2cid=209444271
| arxiv=1912.11019 | doi=10.3847/1538-3881/ab64fa | doi-access=free }}
| title=Exclusion of Stellar Companions to Exoplanet Host Stars
| last1=Wittrock | first1=Justin M. | last2=Kane | first2=Stephen R.
| last3=Horch | first3=Elliott P. | last4=Howell | first4=Steve B.
| last5=Ciardi | first5=David R. | last6=Everett | first6=Mark E.
| journal=The Astronomical Journal
| volume=154 | issue=5 | page=184 | year=2017
| bibcode=2017AJ....154..184W | s2cid=55789971
| arxiv=1709.05315 | doi=10.3847/1538-3881/aa8d69 | doi-access=free }}
| title=Searching for chemical signatures of brown dwarf formation
| last1=Maldonado | first1=J. | last2=Villaver | first2=E.
| journal=Astronomy & Astrophysics
| volume=602 | pages=A38 | year=2017
| bibcode=2017A&A...602A..38M | s2cid=56225222
| arxiv=1702.02904 | doi=10.1051/0004-6361/201630120 }}
| title=A lucky imaging multiplicity study of exoplanet host stars – II
| display-authors=1 | last1=Ginski | first1=C.
| last2=Mugrauer | first2=M. | last3=Seeliger | first3=M.
| last4=Buder | first4=S. | last5=Errmann | first5=R.
| last6=Avenhaus | first6=H. | last7=Mouillet | first7=D.
| last8=Maire | first8=A.-L. | last9=Raetz | first9=S.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=457 | issue=2 | pages=2173–2191 | year=2016
| arxiv=1601.01524 | doi=10.1093/mnras/stw049
| doi-access=free | bibcode=2016MNRAS.457.2173G | s2cid=53626523 }}
| title=An Ultraviolet Investigation of Activity on Exoplanet Host Stars
| last1=Shkolnik | first1=Evgenya L.
| journal=The Astrophysical Journal
| volume=766 | issue=1 | page=9 | year=2013
| arxiv=1301.6192 | bibcode=2013ApJ...766....9S
| s2cid=118415788 | doi=10.1088/0004-637X/766/1/9 }}
{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=The Astrophysical Journal Supplement Series |volume=262 |issue=21 |page=21 |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F |s2cid=251864022 |doi-access=free }}
}}
{{Sky|23|03|08.2070|-|00|25|46.6777}}
{{Pisces (constellation)}}
{{DEFAULTSORT:HD 217786}}
Category:F-type main-sequence stars
Category:Multi-star planetary systems
Category:Planetary systems with one confirmed planet
Category:Pisces (constellation)