Mu Aquarii
 Location of μ Aquarii (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 52m 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[1] mas |
| Distance | 157 ± 2 ly (48.2 ± 0.7 pc) |
| Details | |
| Surface gravity (log g) | 3.99[5] cgs |
| Temperature | 7,181[5] K |
| Rotational velocity (v sin i) | 53.7[5] km/s |
| Other designations | |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Mu Aquarii (μ Aqr, μ Aquarii) is the Bayer designation for a binary star[7] in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent magnitude of 4.7.[2] Based upon parallax measurements, the distance to this system is about 157 light-years (48 parsecs).[1] Mu Aquarii is a spectroscopic binary system with an orbital period of 1,566 days and an eccentricity of 0.23.[8] The combined spectrum matches a stellar classification of A3m, with the 'm' suffix indicating that this is an Am, or chemically peculiar star.[3]
This star system 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.[9][10][11] 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.[12] Consequently, μ Aquarii itself is known as 女宿二 (Nǚ Sù èr, English: the Second Star of Girl / Woman.)[13]
References
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- ↑ ε Aqr as Nir Saad Bula or Lucida Fortunæ Dissipantis (the brightest of luck of the swallower) and the common name is Albali. μ Aqr and ν Aqr was already designated as the common name Albulaan, the plural form of al Bulaʽ.
- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 14 日
