18 Delphini

18 Delphini / Musica
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus
Right ascension 20h 58m 25.9336s[1]
Declination +10° 50′ 21.4261″[1]
Apparent magnitude (V) 5.506[2]
Characteristics
Spectral type G6III[3]
B−V color index 0.934±0.004[4]
Astrometry
Radial velocity (Rv)+4.35±0.15[1] km/s
Proper motion (μ) RA: −50.034±0.147[1] mas/yr
Dec.: −34.198±0.175[1] mas/yr
Parallax (π)13.0922 ± 0.1062 mas[1]
Distance249 ± 2 ly
(76.4 ± 0.6 pc)
Absolute magnitude (MV)1.15[5]
Details[6]
Mass2.35±0.07 M☉
Radius7.19±0.38 R☉
Luminosity33.9+6.9
−5.7 L☉
Surface gravity (log g)3.00±0.04 cgs
Temperature5,071±10 K
Metallicity [Fe/H]0.10±0.02 dex
Rotational velocity (v sin i)1.60±0.45 km/s
Age690±50 Myr
Other designations
Musica, 18 Del, BD+10°4425, GC 29266, HD 199665, HIP 103527, HR 8030, SAO 106712, WDS J20584+1050A[7]
Database references
SIMBADdata

18 Delphini, also named Musica /ˈmjuːzɪkə/,[8][9] is a single[10] star in the constellation of Delphinus of the low northern hemisphere. It has a Sun-like golden hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.506.[2] The star is located at a distance of approximately 249 light years from the Sun based on parallax,[1] and it is drifting further away with a radial velocity of +4 km/s.[1] An object believed to be an extrasolar planet (designated 18 Delphini b or Arion) orbits the star.[5]

  1. ^ a b c d e f g h Cite error: The named reference Gaia DR2 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. ^ Cite error: The named reference mk was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Sato_et_al_2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Jofré_et_al_2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference IAU was invoked but never defined (see the help page).
  9. ^ "musica". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  10. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).