Star in the constellation Aquarius
! 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" | B−V 
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21 Aquarii is a single star in the zodiac constellation of Aquarius. "21 Aquarii" is the Flamsteed designation. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.49. This object is a member of the HR 1614 moving group, and is moving closer to the Earth with a heliocentric radial velocity of −24.5 km/s.
This object is an evolved giant star with a stellar classification of K4 III. As a result of having exhausted the hydrogen at its core, it has expanded to 27 times the radius of the Sun. The star is radiating 203 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,120 K.
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