K-type star in the constellation Delphinus
! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000.0      Equinox J2000.0 (ICRS)
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
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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 .
10 Delphini has a stellar classification of K4 III or K2 III, 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 but at an age of 794 million years — expanded to 18 times the radius of the Sun. It shines at from its enlarged photosphere at an effective temperature of 4,378 K, giving it an orange glow. 10 Del has a solar metallicity.
10 Del has been suspected to be a variable star, although it hasn't been catalogued as such in the GCVS.
References.
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