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Star in the constellation Aquarius From Wikipedia, the free encyclopedia
70 Aquarii is a variable star located 425[2] light years away from the Sun in the equatorial constellation of Aquarius. It has the variable star designation FM Aquarii;[7] 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.[3] This star is moving closer to the Earth with a heliocentric radial velocity of –5.8 km/s.[6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 48m 30.21043s[2] |
Declination | –10° 33′ 19.7143″[2] |
Apparent magnitude (V) | 6.19[3] |
Characteristics | |
Evolutionary stage | main sequencec |
Spectral type | F0 V[4] |
B−V color index | +0.28[3] |
Variable type | δ Sct[5] |
Astrometry | |
Radial velocity (Rv) | –5.8[6] km/s |
Proper motion (μ) | RA: +31.535[2] mas/yr Dec.: +7.915[2] mas/yr |
Parallax (π) | 7.6654 ± 0.0704 mas[2] |
Distance | 425 ± 4 ly (130 ± 1 pc) |
Absolute magnitude (MV) | +0.88[7] |
Details | |
Radius | 4.17+0.17 −0.23[2] R☉ |
Luminosity | 44.8±0.5[2] L☉ |
Surface gravity (log g) | 3.48[7] cgs |
Temperature | 7,314+187 −144[2] K |
Metallicity [Fe/H] | 0.02±0.15[8] dex |
Rotational velocity (v sin i) | 110[9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is an F-type main-sequence star with a stellar classification of F0 V.[4] 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 125 minutes (0.087 days).[5] The star has a high rate of spin, showing a projected rotational velocity of 110 km/s.[9] It has four[2] times the Sun's radius and is radiating 45[2] times the luminosity of the Sun from its photosphere at an effective temperature of around 7,314 K.[2]
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