5 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 52m 08.69383s |
| Declination | −05° 30′ 25.4095″ |
| Apparent magnitude (V) | 5.55 |
| Characteristics | |
| Spectral type | B9 III |
| B−V color index | −0.076±0.010 |
| Astrometry | |
| Radial velocity (Rv) | −2.6±0.6 km/s |
| Proper motion (μ) | RA: +1.271 mas/yr Dec.: −5.828 mas/yr |
| Parallax (π) | 4.1831±0.0861 mas |
| Distance | 780 ± 20 ly (239 ± 5 pc) |
| Absolute magnitude (MV) | −0.94 |
| Details | |
| Luminosity | 317.56 L☉ |
| Surface gravity (log g) | 3.35 cgs |
| Temperature | 11,200 K |
| Metallicity [Fe/H] | 0.10 dex |
| Rotational velocity (v sin i) | 25 km/s |
| Other designations | |
| 5 Aqr, NSV 13360, BD−06°5606, HD 198667, HIP 103005, HR 7985, SAO 144889 | |
| Database references | |
| SIMBAD | data |
5 Aquarii is a single star in the zodiac constellation of Aquarius, located about 780 light years away from the Sun, based on parallax. 5 Aquarii is the Flamsteed designation. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.55. This object is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.
This is a suspected chemically peculiar star star with a stellar classification of B9 III, although Adelman et al. (2004) consider it to be a normal star with near-solar elemental abundances. It is relatively sharp-lined with a projected rotational velocity of 25 km/s. The star is radiating 318 times the luminosity of the Sun from its photosphere at an effective temperature of 11,200 K.