HD 176693

HD 176693
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 18h 59m 08.684s[1]
Declination 48° 25′ 23.60″[1]
Apparent magnitude (V) 8.83[2]
Characteristics
Evolutionary stage Main sequence
Spectral type F8V[3]
B−V color index 0.51[4]
Astrometry
Radial velocity (Rv)−54.76±0.18[5] km/s
Proper motion (μ) RA: 4.704±0.013 mas/yr[1]
Dec.: 9.263±0.016 mas/yr[1]
Parallax (π)11.2176 ± 0.0126 mas[1]
Distance290.8 ± 0.3 ly
(89.1 ± 0.1 pc)
Details[6]
Mass1.05±0.04 M☉
Radius1.253±0.051 R☉
Luminosity1.864[7] L☉
Surface gravity (log g)4.318+0.08
−0.089 cgs
Temperature6,080±65 K
Metallicity [Fe/H]−0.138+0.043
−0.042 dex
Rotation12.89±0.19 d
Rotational velocity (v sin i)2.8±1.0 km/s
Age7.15±1.61[4] Gyr
Other designations
BD+48 2806, HD 176693, Kepler-408, KOI-1612, KIC 10963065, TYC 3545-1227-1, GSC 03545-01227, 2MASS J18590868+4825236, Gaia EDR3 2131593785132997632[8]
Database references
SIMBADdata

HD 176693, also known as Kepler-408, is a star with a close orbiting exoplanet in the northern constellation of Draco. It is located at a distance of 291 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −55 km/s.[5] The star is predicted to come as close as 23.1 light-years in 1.6 million years.[9] It has an apparent visual magnitude of 8.83,[2] which is too faint to be viewed with the naked eye.

The spectrum of HD 176693 matches an F-type main-sequence star with a stellar classification of F8V.[3] The star is older than the Sun, at 7.15 billion years. It is slightly and uniformly[10] depleted in heavy elements compared to the Sun, having about 75% of the solar abundance of iron and other heavy elements.[6] HD 176693 is a chromospherically inactive star,[4] although there is weak evidence for tidal spin-up due to star-planet interaction.[11]

HD 176693 is 5% more massive than the Sun and has a 25% larger radius.[6] It is radiating 1.9[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,080 K. The star is spinning with a rotation period of 12.89 days.[6] As of 2016, multiplicity surveys have not detect any stellar companions to HD 176693.[12]

  1. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Høg_et_al_2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Molenda-Żakowicz_et_al_2013 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Booth2019 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gaia_2022 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Kamiaka2019 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Brito_Lopes_2019 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 Bailer-Jones_et_al_2018 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Ramírez_et_al_2020 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Metcalfe_Egeland_2019 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kraus_et_al_2016 was invoked but never defined (see the help page).