17 Delphini

17 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 55m 36.689s[1]
Declination +13° 43′ 17.531″[1]
Apparent magnitude (V) 5.18[2](5.16-5.27)[3]
Characteristics
Spectral type K0 III[4]
U−B color index +0.95[5]
B−V color index +1.13[5]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)−10.2±0.9[6] km/s
Proper motion (μ) RA: +16.457 mas/yr[1]
Dec.: −11.468 mas/yr[1]
Parallax (π)6.3132 ± 0.0699 mas[1]
Distance517 ± 6 ly
(158 ± 2 pc)
Absolute magnitude (MV)−0.64[7]
Details[8]
Mass2.33 M☉
Radius23.36 R☉
Luminosity219 L☉
Surface gravity (log g)2.07 cgs
Temperature4,616 K
Metallicity [Fe/H]−0.19[9] dex
Rotational velocity (v sin i)3±1[10] km/s
Age832 Myr
Other designations
17 Del, AG+13°2209, BD+13°4572, FK5 3669, GC 29201, HD 199253, HIP 103294, HR 8011, SAO 106665
Database references
SIMBADdata

17 Delphini is a solitary[11] star in the equatorial constellation Delphinus. It has an absolute magnitude of −0.64[7] and apparent magnitude of 5.18,[2] allowing it to be faintly seen with the naked eye. Located 517 light years away,[1] it is approaching the Solar System with a heliocentric radial velocity of −10.2 km/s.[6]

17 Delphini is an orange giant that is most likely on the horizontal branch (84% probability).[8] At present it has 2.33 times the mass of the Sun, but at an age of 832 million years — has expanded to 23.36 times the radius of the Sun.[8] It shines at 219 solar luminosities from its enlarged photosphere at an effective temperature of 4,616 K,[8] giving it an orange glow. 17 Del has an iron abundance 64% that of the Sun[9] and spins modestly with a projected rotational velocity of 3 km/s.[10]

17 Del is suspected to be a variable star of unknown type ranging from 5.16 to 5.27.[3]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Griffin1960 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference GM1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Sotck2018 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Hekker2007 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference deMed1999 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).