5 Aquarii
Star in the constellation Aquarius
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5 Aquarii is a single[8] star in the zodiac constellation of Aquarius,[7] located about 780 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 ICRS | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 52m 08.69383s[1] |
| Declination | −05° 30′ 25.4095″[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: +1.271[1] mas/yr Dec.: −5.828[1] mas/yr |
| Parallax (π) | 4.1831±0.0861 mas[1] |
| Distance | 780 ± 20 ly (239 ± 5 pc) |
| Absolute magnitude (MV) | −0.94[2] |
| Details | |
| Luminosity | 317.56[2] L☉ |
| Surface gravity (log g) | 3.35[5] cgs |
| Temperature | 11,200[5] K |
| Metallicity [Fe/H] | 0.10[5] dex |
| Rotational velocity (v sin i) | 25[6] km/s |
| Other designations | |
| 5 Aqr, NSV 13360, BD−06°5606, HD 198667, HIP 103005, HR 7985, SAO 144889[7] | |
| Database references | |
| SIMBAD | data |
This is a suspected chemically peculiar star[9][5] 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.[10] It is relatively sharp-lined[10] with a projected rotational velocity of 25 km/s.[6] The star is radiating 318 times the luminosity of the Sun from its photosphere at an effective temperature of 11,200 K.[5]