16 Delphini

16 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 55m 38.5698s[1]
Declination +12° 34′ 06.8774″[1]
Apparent magnitude (V) 5.54±0.01[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A5 V[4]
U−B color index +0.09[2]
B−V color index +0.11[2]
Astrometry
Radial velocity (Rv)2.0±4.3[5] km/s
Proper motion (μ) RA: +39.558 mas/yr[1]
Dec.: +27.772 mas/yr[1]
Parallax (π)16.4866 ± 0.06 mas[1]
Distance197.8 ± 0.7 ly
(60.7 ± 0.2 pc)
Absolute magnitude (MV)+1.63[6]
Details
Mass2.0±0.1[7] M☉
Radius1.9±0.1[8] R☉
Luminosity18.7[6] L☉
Surface gravity (log g)4.10±0.14[7] cgs
Temperature9,093±309[7] K
Metallicity [Fe/H]−0.01[9] dex
Rotational velocity (v sin i)159[10] km/s
Age400+150
−215[7] Myr
Other designations
16 Del, AG+12°2414, BD+12°4501, GC 29202, HD 199254, HIP 103298, HR 8012, SAO 106666, WDS J20556+1234A
Database references
SIMBADdata

16 Delphini is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.54,[2] making it faintly visible to the naked eye. The star is relatively close at a distance of 198 light years[1] but is receding with a poorly constrained radial velocity of 2 km/s.[5]

16 Delphini is a chemically peculiar A-type main-sequence star with a stellar classification of A5 V. It has twice the Sun's mass,[7] 1.9 times it's radius,[8] and shines at 18.7 L☉.[6] This yields an effective temperature of 9,039 K,[7] giving it a white glow. 16 Del is 400 million years old[7] – 56.5% through its main sequence lifetime[3] – and spins rapidly with a projected rotational velocity of 159 km/s.[10]

16 Del has a companion that was first discovered by John Herschel and was even noted to be a spectroscopic binary.[11] It is now considered to be a single star. [12]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Oja1991 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference A.P1999 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).