30 Aquarii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 03m 16.45803s |
| Declination | −06° 31′ 20.6748″ |
| Apparent magnitude (V) | 5.558 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K1 IV or G8 III |
| B−V color index | 0.951 |
| Variable type | Constant |
| Astrometry | |
| Radial velocity (Rv) | 39.74 km/s |
| Proper motion (μ) | RA: +45.635 mas/yr Dec.: +8.681 mas/yr |
| Parallax (π) | 10.8432±0.3325 mas |
| Distance | 301 ± 9 ly (92 ± 3 pc) |
| Absolute magnitude (MV) | 0.88 |
| Details | |
| Mass | 2.01 M☉ |
| Radius | 9.86+0.23 −0.25 R☉ |
| Luminosity | 54.7±1.9 L☉ |
| Surface gravity (log g) | 2.860 cgs |
| Temperature | 4,944±79 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 1.6 km/s |
| Age | 1.98 Gyr |
| Other designations | |
| 30 Aqr, BD−07°5688, HD 209396, HIP 108868, HR 8401, SAO 145836 | |
| Database references | |
| SIMBAD | data |
30 Aquarii is a single 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. The star is moving further from the Earth with a heliocentric radial velocity of 40 km/s.
This object is an aging G-type giant star with a stellar classification of G8 III, although Houk and Swift (1999) found a class of K1 IV. It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is nearly two billion years old with a leisurely rotation rate, showing a projected rotational velocity of 1.6 km/s. It has double the mass of the Sun and has expanded to ten times the Sun's radius. The star is radiating 55 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,944 K.