70 Aquarii is a variable star located 425 light years away from the Sun in the equatorial constellation of Aquarius. It has the variable star designation FM Aquarii; 70 Aquarii is the Flamsteed designation. It is near the lower limit of visibility to the naked eye, appearing as a dim, yellow-white hued star with a baseline apparent visual magnitude of 6.19. This star is moving closer to the Earth with a heliocentric radial velocity of –5.8 km/s. Werner Wolfgang Weiss discovered that 70 Aquarii was a variable star in 1977. It was given its variable star designation in 1981. This is an F-type main-sequence star with a stellar classification of F0 V. Located in the lower part of the instability strip, it is a Delta Scuti-type variable that ranges in brightness from magnitude 6.16 down to 6.19 with a period of 0.087 days. The star has a high rate of spin, showing a projected rotational velocity of 110 km/s. It has four times the Sun's radius and is radiating 45 times the luminosity of the Sun from its photosphere at an effective temperature of around 7,314 K.