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μ Aquarii |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 52m 39.2336s |
| Declination | −08° 58′ 59.944″ |
| Apparent magnitude (V) | 4.723 |
| Characteristics | |
| Spectral type | A3m |
| U−B color index | 0.11 |
| B−V color index | 0.32 |
| Astrometry | |
| Radial velocity (Rv) | -9.1 km/s |
| Proper motion (μ) | RA: 47.06 mas/yr Dec.: -32.91 mas/yr |
| Parallax (π) | 21.01 ± 1.04 mas |
| Distance | 155 ± 8 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 5.029 |
| Details | |
| Mass | 3.1 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Metallicity | ? |
| Rotation | 2.31441044 d |
| Age | ? years |
| Orbit | |
| Companion | μ Aquarii B |
| Period (P) | 4.8788501 yr |
| Semimajor axis (a) | 0.1" |
| Inclination (i) | 145° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Mu Aquarii (μ Aqr, μ Aquarii) is a binary star in the constellation Aquarius. It is approximately 155 light years from Earth. It shares the traditional name Albulaan with ν Aquarii. The name derives from an Arabic term al-bulacān (ألبولعان) meaning "the two swallowers". This star, along with ε Aqr (Albali) and ν Aqr (Albulaan), were al Bulaʽ (البلع), the Swallower.[1][2][3]
In Chinese, 奎宿 (Nǚ Sù), meaning Girl (asterism) (or Woman), refers to an asterism consisting of μ Aquarii, ε Aquarii, 4 Aquarii, 5 Aquarii and 3 Aquarii[4]. Consequently, μ Aquarii itself is known as 女宿二 (Nǚ Sù èr, English: the Second Star of Girl / Woman.)[5]
Mu Aquarii is a spectroscopic binary which has a stellar classification of A3m. Its two components have an orbital period of 1782 days and a separation of 0.1 arcseconds.
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