15 Delphini

15 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 49m 37.7673s[1]
Declination +12° 32′ 42.4589″[1]
Apparent magnitude (V) 5.99±0.01[2]
Characteristics
Spectral type F5 V[3]
U−B color index −0.06[4]
B−V color index +0.42[4]
Astrometry
Radial velocity (Rv)4.1±0.4[5] km/s
Proper motion (μ) RA: +52.776 mas/yr[1]
Dec.: +97.020 mas/yr[1]
Parallax (π)33.0028 ± 0.0322 mas[1]
Distance98.83 ± 0.10 ly
(30.30 ± 0.03 pc)
Absolute magnitude (MV)+3.58[6]
Details
Mass1.23[7] M☉
Radius1.42+0.02
−0.04[8] R☉
Luminosity3.01±0.01[8] L☉
Surface gravity (log g)4.24[7] cgs
Temperature6,624±50[9] K
Metallicity [Fe/H]−0.13±0.03[9] dex
Rotational velocity (v sin i)5.6±0.3[10] km/s
Age1.21±0.63[9] Gyr
Other designations
15 Del, AG+12°2395, BD+12°4472, GC 29037, HD 198390, HIP 102805, HR 7973, SAO 106536, WDS J20496+1233A[11]
Database references
SIMBADdata

15 Delphini (15 Del) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.99,[2] allowing it to be faintly seen with the naked eye. The star is relatively close at a distance of 99 light years[1] but is receding with a heliocentric radial velocity of 4.1 km/s.[5]

15 Del has a stellar classification of F5 V,[3] indicating that it is an ordinary F-type main-sequence star. It has 123% the mass of the Sun[7] and a diameter of 1.42 R☉.[8] It radiates at 3 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 6,624 K,[9] giving a yellow-white hue. 15 Del has an iron abundance 74% that of the Sun and at an age of 1.21 billion years[9] — spins leisurely with a projected rotational velocity of 5.6 km/s.[10]

15 Delphini has 3 companions listed below. Components B and D have different proper motions compared to the host. However, C appears to have a common proper motion, suggesting physical relation,[12] but its parallax indicates a further distance compared to 15 Delphini.[13]

15 Delphini's companions[12]
Companion mv PA (°) Year Sep. (″)
B 14.10 19 2013 52.1
C 11.07 86 2020 105.5
D 11.89 276 2020 189.6
  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 Cite error: The named reference Chen2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mermilliod1986 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. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Gomes da Silva2021 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Groot1996 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference dr3c was invoked but never defined (see the help page).