5 Aquarii is a single[9] star in the zodiac constellation of Aquarius,[8] located about 830 light years away from the Sun,[1] 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.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 52m 08.69366s[1] |
| Declination | −05° 30′ 25.4241″[1] |
| Apparent magnitude (V) | 5.55[2] |
| Characteristics | |
| Spectral type | B9 III[3] |
| B−V color index | −0.076±0.010[2] |
| Astrometry | |
| Radial velocity (Rv) | −2.6±0.6[4] km/s |
| Proper motion (μ) | RA: +0.70[5] mas/yr Dec.: −5.52[5] mas/yr |
| Parallax (π) | 3.9834 ± 0.1385 mas[1] |
| Distance | 820 ± 30 ly (251 ± 9 pc) |
| Absolute magnitude (MV) | −0.94[2] |
| Details | |
| Luminosity | 317.56[2] L☉ |
| Surface gravity (log g) | 3.35[6] cgs |
| Temperature | 11,200[6] K |
| Metallicity [Fe/H] | 0.10[6] dex |
| Rotational velocity (v sin i) | 25[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a suspected chemically peculiar star[10][6] star with a stellar classification of B9 III,[3] although Adelman et al. (2004) consider it to be a normal star with near-solar elemental abundances.[11] It is relatively sharp-lined[11] with a projected rotational velocity of 25 km/s.[7] The star is radiating 318 times the luminosity of the Sun from its photosphere at an effective temperature of 11,200 K.[6]