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HD 217786

HD 217786
Observation data
Epoch J2000      Equinox J2000
Constellation Pisces
Right ascension 23h 03m 08.20704s[1]
Declination −00° 25′ 46.6777″[1]
Apparent magnitude (V) 7.78[2]
Characteristics
Spectral type F8V[3]
B−V color index 0.578±0.004[2]
Astrometry
Radial velocity (Rv)+10.00±0.02[2] km/s
Proper motion (μ) RA: −89.933[1] mas/yr
Dec.: −168.781[1] mas/yr
Parallax (π)17.9946 ± 0.0793 mas[1]
Distance181.3 ± 0.8 ly
(55.6 ± 0.2 pc)
Absolute magnitude (MV)4.09[2] + 11.02±0.13[4]
Details[5]
A
Mass1.02 M☉
Radius1.32±0.06 R☉
Luminosity1.93±0.04[6] L☉
Surface gravity (log g)4.13±0.02 cgs
Temperature5,882±8[7] K
Metallicity−0.19±0.01
Rotational velocity (v sin i)1.18±0.05 km/s
Age9.40±0.22 Gyr
HD 217786 B
Mass0.1622+0.0071
−0.0068[4] M☉
Other designations
BD−01°4382, Gaia DR2 2650902026099857920, HD 217786, HIP 113834, TYC 5242-591-1, GSC 05242-00591, 2MASS J23030822-0025465[8]
Database references
SIMBADdata

HD 217786 is a binary star[4] system in the equatorial constellation of Pisces. With an apparent visual magnitude of 7.78,[2] 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.[2] Kinematically, the star system belongs to the thin disk population of the Milky Way.[7]

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.[7] It has about the same mass as the Sun but a 32% larger radius.[5] The star is radiating nearly double[6] the luminosity of the Sun from its photosphere at an effective temperature of 5,882 K.[7]

A low-mass stellar companion at a projected separation of 155 AU was discovered in 2016.[4] 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.[4] No other companion stars have been detected at separations from 2.74 to 76.80 AUs.[6]

The star system exhibits strong stellar flare activity in the ultraviolet.[9]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Ginski2016 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Quarles2019 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Wittrock2017 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Maldonado2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Shkolnik2013 was invoked but never defined (see the help page).

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