| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h52m 39.23277s[1] |
| Declination | −08° 58′ 59.9499″[1] |
| Apparent magnitude (V) | 4.731[2] |
| Characteristics | |
| Spectral type | A3m[3] |
| U−B color index | +0.149[2] |
| B−V color index | +0.322[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.1[4] km/s |
| Proper motion (μ) | RA: +45.75[1] mas/yr Dec.: -33.59[1] mas/yr |
| Parallax (π) | 20.74 ± 0.29 mas[1] |
| Distance | 157 ± 2 ly (48.2 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.31[5] |
| Orbit[6] | |
| Period (P) | 1,566±3 d |
| Semi-major axis (a) | ≥ 67.06 Gm (0.4483 AU) |
| Eccentricity (e) | 0.23±0.19 |
| Periastron epoch (T) | 2,410,497±52 JD |
| Semi-amplitude (K1) (primary) | 3.2±0.6 km/s |
| Details | |
| A | |
| Radius | 3.54+0.45 −0.15[7] R☉ |
| Luminosity | 25.6±1.4[8] L☉ |
| Surface gravity (log g) | 3.99[8] cgs |
| Temperature | 6,906+151 −405[8] K |
| Rotational velocity (v sin i) | 53.7[8] km/s |
| Other designations | |
μ Aqr, 6Aquarii, BD−09 5598, FK5 1547, HD 198743, HIP 103045, HR 7990, SAO 144895, WDS 20527-0859A[9] | |
| Database references | |
| SIMBAD | data |
Mu Aquarii, Latinized from μ Aquarii, is the Bayer designation for a binary star[10] system in the equatorial constellationofAquarius. It is visible to the naked eye with a combined apparent visual magnitude of 4.7.[2] Based upon parallax measurements, the distance to this system is about 157 light-years (48parsecs).[1] It is drifting closer to the Sun with a radial velocity of −9.1 km/s.[4]
This star was tentatively identified as a single-lined spectroscopic binarybyHelmut A. Abt in 1961.[11] It has an orbital period of 4.29 yr and an eccentricity (ovalness) of 0.23.[6] The pair have been resolved by speckle interferometry, showing an angular separationof0.06″.[12] The visible spectrum matches a stellar classification of A3m, with the 'm' suffix indicating that this is an Am, or chemically peculiar star.[3] The primary has an estimated 3.5 times the Sun's radius and is radiating 26 times the luminosity of the Sun from its photosphere at an effective temperature of 6,906 km/s.[7]
This star together with ν AquariiisAlbulaan /ˌælbjəˈlɑːn/, derived from an Arabic term al-bulaʽān (ألبولعان) meaning "the two swallowers". This star, along with ε Aqr (Albali) and ν Aqr (Albulaan), were al Bulaʽ (البلع), the Swallower.[13][14]InChinese, 女宿 (Nǚ Xiù), meaning Girl (asterism) (orWoman), refers to an asterism consisting of μ Aquarii, ε Aquarii, 4 Aquarii, 5 Aquarii and 3 Aquarii.[15] Consequently, the Chinese name for μ Aquarii itself is 女宿二 (Nǚ Xiù èr, English: the Second Star of Girl / Woman.)[16]
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