10 Delphini

10 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 41m 16.2079s[1]
Declination +14° 34′ 58.3606″[1]
Apparent magnitude (V) 6.00±0.01[2]
Characteristics
Spectral type K4 III[3]
U−B color index +1.44[4]
B−V color index +1.24[5]
Astrometry
Radial velocity (Rv)−32±2[6] km/s
Proper motion (μ) RA: −9.462 mas/yr[1]
Dec.: −0.344 mas/yr[1]
Parallax (π)6.6178 ± 0.0397 mas[1]
Distance493 ± 3 ly
(151.1 ± 0.9 pc)
Absolute magnitude (MV)+0.06[7]
Details
Mass2.42±0.71[8] M☉
Radius18.47+1.02
−1.03[9] R☉
Luminosity125±2[9] L☉
Surface gravity (log g)2.27[10] cgs
Temperature4,378[10] K
Metallicity [Fe/H]0.00[10] dex
Age794±33[8] Myr
Other designations
10 Del, AG+14°2269, BD+14°4393, GC 28826, HD 197121, HIP 102080, HR 7918, SAO 106384
Database references
SIMBADdata

10 Delphini (10 Del) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.00, allowing it to be faintly seen with the naked eye. Parallax measurements put the object at a distance of 493 light years but is drifting closer with a heliocentric radial velocity of −32 km/s.

10 Delphini has a stellar classification of K4 III[3] or K2 III,[11] both indicating that it is a red giant. However, there is some uncertainty behind the first classification. It has twice the mass of the Sun[8] but at an age of 794 million years[8] — expanded to 18 times the radius of the Sun.[9] It shines at 125 L☉[9] from its enlarged photosphere at an effective temperature of 4,378 K,[10] giving it an orange glow. 10 Del has a solar metallicity.[10]

10 Del has been suspected to be a variable star, although it hasn't been catalogued as such in the GCVS.[12]

  1. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Adams1935 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Paunzen2022 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference haggkvist_oja was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  7. ^ 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 Feuillet2016 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference DR2 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference Forsberg2019 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Bartkevicius1997 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).