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HD 217786 är en dubbelstjärna i den södra … HD 217786 är en dubbelstjärna i den södra delen av stjärnbilden Fiskarna. Den har en skenbar magnitud av ca 7,78 och kräver åtminstone en stark handkikare eller ett mindre teleskop för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 18,0 mas, beräknas den befinna sig på ett avstånd på ca 181 ljusår (ca 56 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 10 km/s. och ingår i Vintergatans tunna skiva.m/s. och ingår i Vintergatans tunna skiva.
, HD 217786 is a binary star system in the e … 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 181 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.stellar flare activity in the ultraviolet.
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| rdfs:comment |
HD 217786 is a binary star system in the e … 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 181 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 star system exhibits strong stellar flare activity in the ultraviolet.stellar flare activity in the ultraviolet.
, HD 217786 är en dubbelstjärna i den södra … HD 217786 är en dubbelstjärna i den södra delen av stjärnbilden Fiskarna. Den har en skenbar magnitud av ca 7,78 och kräver åtminstone en stark handkikare eller ett mindre teleskop för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 18,0 mas, beräknas den befinna sig på ett avstånd på ca 181 ljusår (ca 56 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 10 km/s. och ingår i Vintergatans tunna skiva.m/s. och ingår i Vintergatans tunna skiva.
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HD 217786
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