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Location of ε Aquarii (right) |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 47m 40.5515s |
| Declination | −09° 29′ 44.793″ |
| Apparent magnitude (V) | 3.77 |
| Characteristics | |
| Spectral type | A1.5V |
| U−B color index | 0.02 |
| B−V color index | 0 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | -16 km/s |
| Proper motion (μ) | RA: 31.89 mas/yr Dec.: -35.32 mas/yr |
| Parallax (π) | 14.21 ± 0.90 mas |
| Distance | 230 ± 10 ly (70 ± 4 pc) |
| Absolute magnitude (MV) | 3.783 |
| Details | |
| Mass | 3.1 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Aquarii (ε Aqr, ε Aquarii) is a star in the constellation Aquarius. It has an obscure traditional name, Albali, from the Arabic البالع albāli‘ "the swallower". (See also Albulaan.)
In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Nir Saad Bula (نير سعد ألبلع - nayyir sa'd al bulaʽ), which was translated into Latin as Lucida Fortunæ Dissipantis, meaning the brightest of luck of the swallower.[1]. This star, along with μ Aqr (Albulaan) and ν Aqr (Albulaan), were al Bulaʽ (البلع), the Swallower.[2][3][4]
In Chinese, 奎宿 (Nǚ Sù), meaning Girl (asterism) (or Woman), refers to an asterism consisting of ε Aquarii, μ Aquarii, 4 Aquarii, 5 Aquarii and 3 Aquarii[5]. Consequently, ε Aquarii itself is known as 女宿一 (Nǚ Sù yī, English: the First Star of Girl / Woman.)[6]
Albali belongs to the spectral class A0 and has an apparent magnitude of +3.8. It is 215 light-years from Earth.
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