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Star in the constellation Aquarius From Wikipedia, the free encyclopedia
30 Aquarii is a single[10] star located about 301 light years away from the Sun in the zodiac constellation of Aquarius. 30 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.56.[2] The star is moving further from the Earth with a heliocentric radial velocity of 40 km/s.[2]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 03m 16.45803s[1] |
Declination | −06° 31′ 20.6748″[1] |
Apparent magnitude (V) | 5.558[2] |
Characteristics | |
Evolutionary stage | giant |
Spectral type | K1 IV[3] or G8 III[4] |
B−V color index | 0.951[2] |
Variable type | Constant[5] |
Astrometry | |
Radial velocity (Rv) | 39.74[2] km/s |
Proper motion (μ) | RA: +45.635[1] mas/yr Dec.: +8.681[1] mas/yr |
Parallax (π) | 10.8432 ± 0.3325 mas[1] |
Distance | 301 ± 9 ly (92 ± 3 pc) |
Absolute magnitude (MV) | 0.88[6] |
Details | |
Mass | 2.01[2] M☉ |
Radius | 9.86+0.23 −0.25[1] R☉ |
Luminosity | 54.7±1.9[1] L☉ |
Surface gravity (log g) | 2.860[7] cgs |
Temperature | 4,944±79[2] K |
Metallicity [Fe/H] | −0.11[7] dex |
Rotational velocity (v sin i) | 1.6[8] km/s |
Age | 1.98[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This object is an aging G-type giant star[6][5] with a stellar classification of G8 III,[4] although Houk and Swift (1999) found a class of K1 IV.[3] It is a red clump giant,[6] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is nearly two[2] billion years old with a leisurely rotation rate, showing a projected rotational velocity of 1.6 km/s.[8] It has double[2] the mass of the Sun and has expanded to ten[1] times the Sun's radius. The star is radiating 55[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,944 K.[2]
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